Pages

Tuesday, October 31, 2017

This Month in Physics History

Infrared photography is an invaluable workhorse tool across many different scientific fields and practical applications, as well as a popular hobby among professional and amateur photographers. And we owe its existence — as well as that of ultraviolet photography — to an enterprising American physicist and inventor named Robert Williams Wood, best known in scientific circles for his research on optics and spectroscopy.

Infrared radiation was discovered in 1800 by Sir Frederick William Herschel, best known for building telescopes and discovering the planet Uranus. Herschel painted the bulbs of three thermometers black, and then arranged them with one tip in the solar spectrum made by a prism, and the other two outside the spectrum to serve as controls. His first finding was that as he moved the thermometer across the spectrum from violet to red, the thermometer temperature steadily increased. His second was that moving the blackened thermometer just beyond the red end of the spectrum produced the highest temperature of all. This experiment was the first observation of light beyond the visible spectrum.

Photography came into its own in the 19th century, but it was not possible to make pictures of anything in the infrared, because the chemicals used for early photography were not sensitive to longer wavelengths of light. Wood resolved that issue and thereby launched an industry.

Born in Concord, Massachusetts in 1868, Wood initially planned to become a priest. But one night he observed an aurora and became fascinated by what might cause such a phenomenon. He thought the culprit might be "invisible rays," leading him to study optics instead. After earning degrees from Harvard, MIT, and the University of Chicago, he joined the faculty of Johns Hopkins University in 1901, where he remained until his death in 1955.

Wood made waves early in his career with his infamous debunking of French physicist René Blondlot's claim to have discovered a new type of radiation called "N-rays." Unable to replicate Blondlot's results, Wood traveled to France in 1904 to observe the experiment firsthand. He removed a crucial prism from the apparatus between runs when the Frenchman wasn't looking, and when Blondlot still claimed to observe N-rays on the second run, Wood concluded he was deluding himself, and wrote a letter to Nature debunking the claim.

The year before, in 1903, Wood invented an ultraviolet filter for photography, which he made from nitroso-dimethyl-aniline, combined with a small amount of a dye called uranine. This made the filter block visible light but transmit ultraviolet, and he used it to take the first photographs of ultraviolet fluorescence. The filter became known as "Wood's glass," and was the technology behind blacklight lamps. It also transmitted some infrared light, although very long exposures were required.

Several of his photos appeared in the October 1910 issue of the Royal Photographic Society Journal, as illustrations for Wood's papers on the optical effects involved — including the so-called "Wood effect," which is the dreamlike appearance of photographs in the infrared. Infrared photographs feature a milky appearance to skin in portraits, and also dark skies — the Rayleigh scattering that makes the sky blue doesn't scatter much infrared. Also, the infrared wavelengths penetrate a few millimeters beneath the dermis, and then reflect back out of the skin, so they can image blood vessels within this thin layer.

Wood didn't show much interest in profiting from his filters, even though during World War I, infrared-sensitive photographic plates were used for spectroscopic analysis. It wasn't until the 1930s that infrared film hit the commercial sector, when Kodak introduced the first emulsions designed for infrared photography. By the 1960s, the company offered 35mm false-color infrared film, and the popularity of infrared photography boomed — driven in part by its use in pop music album covers by rock stars such as Jimi Hendrix and Frank Zappa. The advent of digital cameras made physical films obsolete, and Kodak responded to the sharp decline in demand by discontinuing its 35mm infrared film products in 2007.

While Wood's specialty was optics, he also made important contributions to the field of ultrasound. It started with a demonstration for his students to elucidate the wave nature of light by photographing the sound waves given off by an electric spark (a method invented by August Toepler). During World War I, Woods shifted to ultrasonics, and he worked in Paul Langevin's lab developing ultrasound for detecting submarines. By 1926, he wound up working with Alfred Lee Loomis to develop high-power ultrasonic sources. Their experiments revealed that ultrasound could melt the interior of an ice cube before the exterior, tear apart living cells, and kill frogs, mice, and small fish with just one or two minutes of exposure.

Over his long and varied career, Wood also assisted in the investigation of the infamous Wall Street bombing of 1920, among other cases, and is often credited with the invention of tear gas. He spun the surface of mercury into a parabolic mirror and with it built a working reflecting telescope. In addition to scientific treatises, he co-authored two science fiction novels (The Man Who Rocked the Earth and The Moon Maker), as well as two children's books of nonsense verse. He died in 1955 in Amityville, New York.

Today, infrared photography is used in the study of plant diseases, revealing changes in pigment or cellular material; in paleobotany; to enhance details of deeply pigmented tissues in photomicrography in the biological sciences; and by the textile industry to detect irregularities in fibers. It is also used in criminal investigations to examine and identify cloth, fibers and hair, and it's become a standard laboratory tool for imaging faded, damaged or altered documents. One hopes Wood would be gratified to see how ubiquitous his technique has become.

Further Reading:

Klotz, I.M. (May 1980) The N-Ray Affair, Sci. Am., May 1980.

Seabrook, W. (1941) Doctor Wood, Modern Wizard of the Laboratory, New York: Harcourt Brace.

Wood, R. (1903) On screens transparent only to ultraviolet light and their use in spectrum photography, Phil. Mag. 5, 257-263.

Wood, R. (1910) Photography by invisible rays, Photogr. J. 50, 329.

Infrared photoPhoto: Photogr. J. 50, 329 (1910)

Infrared landscape image taken by Robert Wood

Sound wavefronts photoPhoto: Nature 62, 349 (1900)

Wood's photographs of sound waves


Source: This Month in Physics History

Monday, October 30, 2017

Washington D.C. is frighteningly cool in infrared photos

The Capitol building is seen through trees in Washington DC on September 26, 2017. / AFP PHOTO / Andrew CABALLERO-REYNOLDS (Photo credit should read ANDREW CABALLERO-REYNOLDS/AFP/Getty Images)

The sun shines on the Three Servicemen near the Vietnam Memorial in Washington DC on September 20, 2017. / AFP PHOTO / Andrew CABALLERO-REYNOLDS (Photo credit should read ANDREW CABALLERO-REYNOLDS/AFP/Getty Images)

Two Girl scouts lay a wreath at the Tob of the Unknowen solider at Arlington Cemetary in Arlington, Virginia on September 21, 2017. / AFP PHOTO / Andrew CABALLERO-REYNOLDS (Photo credit should read ANDREW CABALLERO-REYNOLDS/AFP/Getty Images)

TOPSHOT - The Washington Monument is reflected in the Consitution Gardens Pond in Washington DC on September 20, 2017. / AFP PHOTO / Andrew CABALLERO-REYNOLDS (Photo credit should read ANDREW CABALLERO-REYNOLDS/AFP/Getty Images)

The statues of soilders are seen at the Korean War memorial in Washington DC on August 31, 2017. / AFP PHOTO / Andrew CABALLERO-REYNOLDS (Photo credit should read ANDREW CABALLERO-REYNOLDS/AFP/Getty Images)

Headstones are seen at Arlington Cemetary in Arlington, Virginia on September 21, 2017. / AFP PHOTO / Andrew CABALLERO-REYNOLDS (Photo credit should read ANDREW CABALLERO-REYNOLDS/AFP/Getty Images)

The front of the Supreme Court building is seen through trees in Washington DC on September 26, 2017. / AFP PHOTO / Andrew CABALLERO-REYNOLDS (Photo credit should read ANDREW CABALLERO-REYNOLDS/AFP/Getty Images)

A Park Ranger plays guitar near a sculpture at the Franklin Delano Roosevelt Memorial in Washington DC on September 20, 2017. / AFP PHOTO / Andrew CABALLERO-REYNOLDS (Photo credit should read ANDREW CABALLERO-REYNOLDS/AFP/Getty Images)

Protesters rally near the Capitol building in Washington DC on September 26, 2017. / AFP PHOTO / Andrew CABALLERO-REYNOLDS (Photo credit should read ANDREW CABALLERO-REYNOLDS/AFP/Getty Images)

The statues of soilders are seen at the Korean War memorial in Washington DC on August 31, 2017. / AFP PHOTO / Andrew CABALLERO-REYNOLDS (Photo credit should read ANDREW CABALLERO-REYNOLDS/AFP/Getty Images)

The fountain is seen at the Worl War II Memorial in Washington DC on September 20, 2017. / AFP PHOTO / Andrew CABALLERO-REYNOLDS (Photo credit should read ANDREW CABALLERO-REYNOLDS/AFP/Getty Images)

People walk near the Lincoln memorial in Washington DC on September 20, 2017. / AFP PHOTO / Andrew CABALLERO-REYNOLDS (Photo credit should read ANDREW CABALLERO-REYNOLDS/AFP/Getty Images)

People walk past the Martin Luther King Jr. Memorial in Washington DC on September 20, 2017. / AFP PHOTO / Andrew CABALLERO-REYNOLDS (Photo credit should read ANDREW CABALLERO-REYNOLDS/AFP/Getty Images)

Trees frame the Jefferson Memorial across the Tidal Basin in Washington DC on September 20, 2017. / AFP PHOTO / Andrew CABALLERO-REYNOLDS (Photo credit should read ANDREW CABALLERO-REYNOLDS/AFP/Getty Images)

Headstones are seen at Arlington Cemetary in Arlington, Virginia on September 21, 2017. / AFP PHOTO / Andrew CABALLERO-REYNOLDS (Photo credit should read ANDREW CABALLERO-REYNOLDS/AFP/Getty Images)

The Martin Luther King Jr. Memorial is seen through trees in Washington DC on September 20, 2017. / AFP PHOTO / Andrew CABALLERO-REYNOLDS (Photo credit should read ANDREW CABALLERO-REYNOLDS/AFP/Getty Images)

The Albert Einstein monument is seen behind bushes in Washington DC on September 20, 2017. / AFP PHOTO / Andrew CABALLERO-REYNOLDS (Photo credit should read ANDREW CABALLERO-REYNOLDS/AFP/Getty Images)

The White House is seen in Washington DC on August 13, 2017. / AFP PHOTO / Andrew CABALLERO-REYNOLDS (Photo credit should read ANDREW CABALLERO-REYNOLDS/AFP/Getty Images)


Source: Washington D.C. is frighteningly cool in infrared photos

Friday, October 27, 2017

Change the white balance (or other configuration) on a Mobius camera

This is part of the documentation of the Infragram Point & Shoot but also applies to any Mobius Action Cam settings you want to change.

White balance

One step you need to take to set up this camera is to configure the white balance; otherwise, your images will be flooded with infrared and will look pinkish -- and the NDVI post-processing steps (see NDVI) and https://publiclab.org/notes/warren/10-20-2017/getting-started-with-infrared-photography-on-infragram-orgthis activity won't work.

Images should look roughly like the "GOOD" example below -- vegetation should appear generally pastel blue. An incorrectly white-balanced image such as the "BAD" example below may appear with an overall reddish tint. This means the camera probably has not accepted your config file, possibly due to misformatting or incorrect uploading.

good-bad.png

Software

Manually setting the config file is not hard, but there are now also programs to guide you through the process automatically, (thanks to @cfastie and @patcoyle for finding these!)

https://www.mobius-actioncam.com/downloads-info/

If you're going to do it yourself manually, read on!

Installing config file

If your camera did not ship with a config file or you are using a new SD card, follow these steps to get your Infragram Point & Shoot to take properly white-balanced images, necessary for post processing at Infragram.org. This is also relevant for anyone who has a Mobius Action Cam and wants to script or customize its settings.

The config file may also be used to set up Timelapse Mode -- see the Infragram Point & Shoot activities for timelapse setup.

Note: The white balance setting in the config file should be "7" but occasionally we've found that some cameras require an "8" -- if you have trouble, please leave a comment here or post a question.

modes

Artwork based on this note by @mathew

Config steps
  • turn the camera on with the "Power" button while also pressing "Mode" until the red light blinks 3 times (5-6 secons) to generate a config
  • plug it in via USB and wait for the disk to appear
  • replace the generated config file with this one in the home directory: SYSCFG.TXT or SYSCFG.TXT for a 2-second timelapse mode.
  • repeat turn on pressing mode.
  • Different white balance settings

    There's a good question posted by @abdul on what settings are the best for doing NDVI ( #ndvi) and while the above config file should work, there may be better settings to use; please post feedback in the that question and we can update the config file here accordingly if we find a clear improvement in a different configuration!

    Manually changing the config file

    At step 3, you can alternatively, you can also edit the file yourself.

    If you choose to edit it yourself, you can do so first by changing the default mode of the camera at the top of the document. Where the text reads Default Mode =[0] change the 0 for a 2 -- Mode 2 is picture mode.

    Next, scroll down to the paragraph that begins, "Enable Manual AE Lock or AWB Lock." In this paragraph you will find a line that begins White Balance =[0] and again, you can change the white balance to 5, 6, or 7, which are all custom white balance 1, 2 and 3 respectively. Lower down, you can see the area where you set the custom white balance by changing the gain values for red, green, and blue.

    Community members have found (discuss this here) that values of about 250 for red gain, about 500 for green gain, and about 900 for blue gain are ideal.

    Set the gain values in your custom white balance, and don't forget to set the white balance to the your new custom value.

    From here, you can save your work and continue!

    Place the SD card back in the camera and this time hold BOTH the power button and the mode button until the LED flashes red. You will have to hold the two buttons for notably longer than you had to hold the power button last time, as long as 7 seconds, before the LED begins to flash red.

    These files are not extremely complicated and can be manipulated by you at any time. If you find a configuration that is more optimal than ours, please post a response here. We rely on community members like you to help improve these tools!


    Source: Change the white balance (or other configuration) on a Mobius camera

    Wednesday, October 25, 2017

    Organic near-infrared filter developed by NIIST team

    R. Prasad , October 24, 2017 23:40 IST

    Updated: October 25, 2017 00:31 IST

    "; var device = ""; for ( var type in WFClientTypeDef) { if (window.matchMedia(WFClientTypeDef[type]).matches) { switch (type) { case "xlarge": device = 'desktop'; break; case "large": device = 'desktop'; break; case "medium": device = 'tab'; break; case "small": device = 'mobile'; break; } break; } } var writeOnDocument = true; var skipOnDeviceValue = "[medium, small]"; var noSkipOnDevice = skipOnDeviceValue.length > 0; if(noSkipOnDevice) { if (skipOnDeviceValue.indexOf("large") > -1 && 'desktop' == device) { writeOnDocument = false; } if (skipOnDeviceValue.indexOf("medium") > -1 && 'tab' == device) { writeOnDocument = false; } if (skipOnDeviceValue.indexOf("small") > -1 && 'mobile' == device) { writeOnDocument = false; } } if(writeOnDocument) { d.write(adcode); } }(document);

    An organic filter that allows only near-infrared (NIR) light to pass through has been developed by scientists at the CSIR-National Institute for Interdisciplinary Science and Technology (CSIR-NIIST) based in Thiruvananthapuram.

    The new NIR filter can be used for night vision glasses, night photography, and will have applications in security and forensics such as identifying blood stains on a dark fabric.

    Currently available inorganic filters are expensive and brittle whereas organic filters are easy to process and flexible too.

    The filter was prepared by mixing a black dye (diketopyrrolopyrrole or DPP) having an amide group that helps the molecules to be in close contact with each other and interact, leading to changes in their optical properties.

    "The amide group helps in binding and self-assembly of the molecule leading to the formation of a soft organogel," says Ayyappanpillai Ajayaghosh, Director of NIIST, who led the team of researchers.

    O rganogel is key

    The organogel-based filter has the ability to absorb both ultraviolet and visible light while allowing the near-infrared light alone to pass through. The nanofibres formed through the self-assembly of the DPP molecules are responsible for the broad light absorption of the material, making it appear dark.

    The researchers developed the filter by mixing the organogel with a transparent polymer (polydimethylsiloxane). The addition of the dye turns the transparent polymer into a semi-transparent one and the filter appears black as it absorbs most of the ultraviolet-visible light.

    "Only very little of the organogel has to be added to the polymer to make the filter. The material is present throughout the polymer matrix even though very little is added," says Samrat Ghosh from the Chemical Sciences and Technology Division at NIIST and the first author of the paper published in the journal Advanced Materials.

    The filter was found to absorb light f rom 300-850 nm (both ultraviolet, visible and a part of NIR light) and transmit NIR light from 850-1500 nm. The researchers tested it for night photography and found the filter responsive only to NIR light.

    Dried blood stains on a black cloth that remained invisible to naked eyes became clearly visible and detectable when viewed through a camera with the NIR filter. Tampering of a cheque which was not discernible to naked eyes could be easily identified when viewed through a camera with the filter.

    A potential application of the new material is in the design of hidden security codes on documents which can be viewed only through a NIR-readable camera.


    Source: Organic near-infrared filter developed by NIIST team

    Tuesday, October 24, 2017

    Change the white balance (or other configuration) on a Mobius camera

    This is part of the documentation of the Infragram Point & Shoot but also applies to any Mobius Action Cam settings you want to change.

    White balance

    One step you need to take to set up this camera is to configure the white balance; otherwise, your images will be flooded with infrared and will look pinkish -- and the NDVI post-processing steps (see NDVI) and https://publiclab.org/notes/warren/10-20-2017/getting-started-with-infrared-photography-on-infragram-orgthis activity won't work.

    Images should look roughly like the "GOOD" example below -- vegetation should appear generally pastel blue. An incorrectly white-balanced image such as the "BAD" example below may appear with an overall reddish tint. This means the camera probably has not accepted your config file, possibly due to misformatting or incorrect uploading.

    good-bad.png

    Software

    Manually setting the config file is not hard, but there are now also programs to guide you through the process automatically, (thanks to @cfastie and @patcoyle for finding these!)

    https://www.mobius-actioncam.com/downloads-info/

    If you're going to do it yourself manually, read on!

    Installing config file

    If your camera did not ship with a config file or you are using a new SD card, follow these steps to get your Infragram Point & Shoot to take properly white-balanced images, necessary for post processing at Infragram.org. This is also relevant for anyone who has a Mobius Action Cam and wants to script or customize its settings.

    The config file may also be used to set up Timelapse Mode -- see the Infragram Point & Shoot activities for timelapse setup.

    Note: The white balance setting in the config file should be "7" but occasionally we've found that some cameras require an "8" -- if you have trouble, please leave a comment here or post a question.

    modes

    Artwork based on this note by @mathew

    Config steps
  • turn the camera on with the "Power" button while also pressing "Mode" until the red light blinks 3 times (5-6 secons) to generate a config
  • plug it in via USB and wait for the disk to appear
  • replace the generated config file with this one in the home directory: SYSCFG.TXT or SYSCFG.TXT for a 2-second timelapse mode.
  • repeat turn on pressing mode.
  • Different white balance settings

    There's a good question posted by @abdul on what settings are the best for doing NDVI ( #ndvi) and while the above config file should work, there may be better settings to use; please post feedback in the that question and we can update the config file here accordingly if we find a clear improvement in a different configuration!

    Manually changing the config file

    At step 3, you can alternatively, you can also edit the file yourself.

    If you choose to edit it yourself, you can do so first by changing the default mode of the camera at the top of the document. Where the text reads Default Mode =[0] change the 0 for a 2 -- Mode 2 is picture mode.

    Next, scroll down to the paragraph that begins, "Enable Manual AE Lock or AWB Lock." In this paragraph you will find a line that begins White Balance =[0] and again, you can change the white balance to 5, 6, or 7, which are all custom white balance 1, 2 and 3 respectively. Lower down, you can see the area where you set the custom white balance by changing the gain values for red, green, and blue.

    Community members have found (discuss this here) that values of about 250 for red gain, about 500 for green gain, and about 900 for blue gain are ideal.

    Set the gain values in your custom white balance, and don't forget to set the white balance to the your new custom value.

    From here, you can save your work and continue!

    Place the SD card back in the camera and this time hold BOTH the power button and the mode button until the LED flashes red. You will have to hold the two buttons for notably longer than you had to hold the power button last time, as long as 7 seconds, before the LED begins to flash red.

    These files are not extremely complicated and can be manipulated by you at any time. If you find a configuration that is more optimal than ours, please post a response here. We rely on community members like you to help improve these tools!


    Source: Change the white balance (or other configuration) on a Mobius camera

    Monday, October 23, 2017

    Foundation surprises teachers with grants

    Foundation for Educational Excellence grant awards

    • "Back to Native: Pollinator Garden," Nancy Ungvarsky and Deborah Kidd, Beaufort High School.

    • "Magnetic Math and Engineering," Eve Weaver, Robert Smalls International Academy.

    • "Geometry in Motion: Integrating Art and Math with Origami," Eve Weaver, Robert Smalls International Academy.

    • "Hands and Hearts Across the Ages," Cynthia Strandt, Hilton Head Island School for the Creative Arts.

    • "Amazing Animal Stories," Lena Beason, Hilton Head Island International Baccalaureate Elementary.

    • "Infrared Photography: Beyond the Visible Light Spectrum," John Cullinen, Battery Creek High.

    • "Disney's Mulan Jr.," Christopher Crabb and Nicholas Glick, Mossy Oaks Elementary.

    • "Critical Thinking with Games," Shelley Krebs, Port Royal Elementary.

    • "Crack the Codes," Jennifer Friend-Kerr, Hilton Head Island School for the Creative Arts.

    • "Foundations in Personal Finance," Alexis Hines, Beaufort Middle.

    • "A Snapshot of Me!" Melissale Rivera, Joseph S. Shanklin Elementary.

    • "Path to Success," Kim Gartner, Hilton Head Island High.

    • "Lego STEM Instruction and Enrichment," Elizabeth Trott, Pritchardville Elementary.

    • "Literacy STEMS from Fascinating Books," Lynda Jernigan, River Ridge Academy.

    • "Okie Owls Read and Ride," Melissa Lane, Okatie Elementary.

    • "Speech Ther-APP-y," Elizabeth Strickland, River Ridge Academy.

    • "Can You Hear Me Now?" Kristen Parson, Pritchardville Elementary.

    • "Say What?" Heidi McAllister, H.E. McCracken Middle.


    Source: Foundation surprises teachers with grants

    Saturday, October 21, 2017

    History Speaks: History of Forensic Imaging & Photography

    Click Here to access the online Public Inspection File

    Viewers with disabilities can get assistance accessing this station's FCC Public Inspection File by contacting the station with the information listed below. Questions or concerns relating to the accessibility of the FCC's online public file system should be directed to the FCC at 888-225-5322, 888-835-5322 (TTY), or fccinfo@fcc.gov.


    Source: History Speaks: History of Forensic Imaging & Photography

    Friday, October 20, 2017

    Why these big sensors make us question the practical limits

    Upcoming RED and Sony cameras are set to offer us some truly enormous slabs of silicon, something that the world seems only too ready to enthuse about, given the huge imaging performance represented by such a large number of such large pixels. Are we at the limits of practical size?

    The suitability of a really big chip for a given job depends on the idea that depth of field is for the weak and ninja focus pullers grow on trees, but there are certainly things to like about the idea.

    If we're decided that bigger is better, then, it seems that LargeSense, a large-format camera company, might well have the biggest and therefore best camera going. To raise the caveats early, this is a six-figure, monochrome camera which is still in the experimental stage, but it has a sensor — wait for it — fully 9 by 11 inches. Generally, the company refers to the LS911 as an eight by ten camera for no better reason than that "eight by ten" is a well-known specification for large format film negatives, but in actuality the piece of silicon involved is 9 by 11 inches, or 228 by 279.4 millimetres, for a total of 99 square inches of unbroken silicon.

    By way of comparison, a super-35mm sensor is less than an inch in its longest dimension, and has an area of only 0.7203 inches, meaning the LS911 has roughly 137 times the area. Sensibly, the LS911 has a modest resolution and is capable of shooting video at 26 frames per second at up to 3888 by 3072. The twelve megapixel total reminds us of the famously sensitive piece of silicon that Sony gave us in the A7S. While other cameras give us lots of pixels, Sony's design trades pixel count for pixel size, increasing sensitivity and dynamic range. An A7S series camera has pixels on an 8.4-micron pitch, which makes them among the biggest available in an affordable DSLR.

    The LS911, on the other hand, has pixels 75 microns across, which, in case anyone wasn't clear, is absolutely gigantic. There is a two-by-two pixel binning mode which is available for video work and allows for images slightly beyond HD resolution at up to 70 frames per second. At that point, it's practically possible to climb inside the effective pixel area and have a stroll around. The highest sensitivity is 6,400 ISO, including an appropriate infra-red filter and the camera produces 16-bit files from a 14-bit A/D converter.

    While the company is talking about a colour filter wheel for making sequential colour images of static subjects, there are no colour filters on the chip itself and hence images are monochrome. There's also no infrared filtering, which allows the camera to be used for infrared photography as required, nor is there any antialiasing filter or microlens array. It's a comparatively bare sensor, although, given the vast size of its photosites, the influence of aliasing ought to be minimal in any case. Particularly, omitting the microlenses might help with older, film-oriented lenses which are not very image-space telecentric and may vignette on many digital cameras — and more or less any lens capable of filling an acre of silicon is likely to be intended for the last film holdouts.

    Of course, this sort of thing — even when it's released — will not be a practical option for everyday filmmaking. It's not a motion picture camera (though there is audio input, apparently) and there's no word on how the pictures are to be recorded. Even so, it's interesting to know that, in extremis, we can do this — even if it has to cost around a hundred thousand dollars.


    Source: Why these big sensors make us question the practical limits

    Thursday, October 19, 2017

    Lee Filters ProGlass IRND Review

    They're claimed to set a new standard in neutral density glass filters but how good is the Lee Filters ProGlass IRND range? Michael Topham investigates


    Source: Lee Filters ProGlass IRND Review

    Wednesday, October 18, 2017

    Why these big sensors make us question the practical limits

    Upcoming RED and Sony cameras are set to offer us some truly enormous slabs of silicon, something that the world seems only too ready to enthuse about, given the huge imaging performance represented by such a large number of such large pixels. Are we at the limits of practical size?

    The suitability of a really big chip for a given job depends on the idea that depth of field is for the weak and ninja focus pullers grow on trees, but there are certainly things to like about the idea.

    If we're decided that bigger is better, then, it seems that LargeSense, a large-format camera company, might well have the biggest and therefore best camera going. To raise the caveats early, this is a six-figure, monochrome camera which is still in the experimental stage, but it has a sensor — wait for it — fully 9 by 11 inches. Generally, the company refers to the LS911 as an eight by ten camera for no better reason than that "eight by ten" is a well-known specification for large format film negatives, but in actuality the piece of silicon involved is 9 by 11 inches, or 228 by 279.4 millimetres, for a total of 99 square inches of unbroken silicon.

    By way of comparison, a super-35mm sensor is less than an inch in its longest dimension, and has an area of only 0.7203 inches, meaning the LS911 has roughly 137 times the area. Sensibly, the LS911 has a modest resolution and is capable of shooting video at 26 frames per second at up to 3888 by 3072. The twelve megapixel total reminds us of the famously sensitive piece of silicon that Sony gave us in the A7S. While other cameras give us lots of pixels, Sony's design trades pixel count for pixel size, increasing sensitivity and dynamic range. An A7S series camera has pixels on an 8.4-micron pitch, which makes them among the biggest available in an affordable DSLR.

    The LS911, on the other hand, has pixels 75 microns across, which, in case anyone wasn't clear, is absolutely gigantic. There is a two-by-two pixel binning mode which is available for video work and allows for images slightly beyond HD resolution at up to 70 frames per second. At that point, it's practically possible to climb inside the effective pixel area and have a stroll around. The highest sensitivity is 6,400 ISO, including an appropriate infra-red filter and the camera produces 16-bit files from a 14-bit A/D converter.

    While the company is talking about a colour filter wheel for making sequential colour images of static subjects, there are no colour filters on the chip itself and hence images are monochrome. There's also no infrared filtering, which allows the camera to be used for infrared photography as required, nor is there any antialiasing filter or microlens array. It's a comparatively bare sensor, although, given the vast size of its photosites, the influence of aliasing ought to be minimal in any case. Particularly, omitting the microlenses might help with older, film-oriented lenses which are not very image-space telecentric and may vignette on many digital cameras — and more or less any lens capable of filling an acre of silicon is likely to be intended for the last film holdouts.

    Of course, this sort of thing — even when it's released — will not be a practical option for everyday filmmaking. It's not a motion picture camera (though there is audio input, apparently) and there's no word on how the pictures are to be recorded. Even so, it's interesting to know that, in extremis, we can do this — even if it has to cost around a hundred thousand dollars.


    Source: Why these big sensors make us question the practical limits

    Tuesday, October 17, 2017

    In France : Art 'detectives' probe what lies beneath a Fragonard

    For decades, she was thought to have started out as a man.

    But a sketch uncovered at an obscure Parisian auction in 2012 triggered groundbreaking research that revealed the original painting beneath Jean-Honore Fragonard's "Young Girl Reading" to be a woman gazing outward.

    "The drawing pointed out this likely inaccuracy," said Michael Swicklik, senior conservator at the National Gallery of Art in Washington, adjusting his magnifying glasses to examine the luminous 250-year-old portrait of a girl in a bright lemon dress absorbed in her book.

    Swicklik was part of a trio of experts who used techniques akin to those NASA deployed on its Mars rovers to dispel any doubt the work belonged to a boldly experimental series by a young Fragonard, just coming into his own two decades before the French Revolution.

    There is no significant record from the period of the artist's legendary "Fantasy Figures," created around 1769, which Paris Louvre senior curator Guillaume Faroult described to AFP as "one of the absolute masterpieces in the history of painting."

    Even less was known about "Young Girl Reading," whose profile view had relegated her to the periphery of the series.

    "Young Girl Reading" by Jean-Honore Fragonard is seen at the National Gallery of Art's painting conservation studio, where conservators examine and touch up other priceless worksplay

    "Young Girl Reading" by Jean-Honore Fragonard is seen at the National Gallery of Art's painting conservation studio, where conservators examine and touch up other priceless works

    (AFP)

    When the painting was restored in 1985, experts erroneously concluded a man lay beneath based on x-ray imaging.

    But today, researchers have many more tools at their disposal, and the National Gallery's team was able to confirm suspicions aroused by the newly discovered sketch of the series.

    "That we could actually then re-examine the painting through these new techniques and prove that it was inaccurate and how inaccurate it was, and actually simulate what it looked like, was very exciting for a conservator," Swicklik said, gesturing at the unframed painting in the museum's conservation studio as colleagues around him worked on other gems.

    Shrouded in mystery

    The fantasy figures portray members of Fragonard's social circle dressed in extravagant masquerade style and looking out in engaging, theatrical poses.

    Fragonard, known for highly decorative, veiled eroticism in works like "The Swing," highlighted more minute details here in the women than the men, using the back of his paintbrush to evoke collar creases.

    National Gallery of Art senior conservator of paintings Michael Swicklik speaks about "Young Girl Reading"play

    National Gallery of Art senior conservator of paintings Michael Swicklik speaks about "Young Girl Reading"

    (AFP)

    The girl's profile view had relegated her to the margins of the series, despite the similar dress, light source and frenetic brushstrokes applied "alla prima" (wet on wet paint) with virtuosic ease and agility.

    But the sketched vignette matching the portrait showed the subject facing the viewer.

    "It was not a painting about which we imagined making further discoveries," said Yuriko Jackall, the museum's 18th century French painting expert who enlisted the help of Swicklik and senior imaging scientist John Delaney.

    Fragonard "seems to have made one composition and left it alone for a while, and then come back to it several months or maybe a few years later," explained Jackall.

    "Why did Fragonard make a change like this? Was this because the model rejected the painting and so the painting remained unsold? Was it that the initial painting was almost like a figure study? We are not totally sure."

    Going in blind National Gallery of Art assistant curator of French paintings Yuriko Jackall, next to an x-radiograph of "Young Girl Reading"play

    National Gallery of Art assistant curator of French paintings Yuriko Jackall, next to an x-radiograph of "Young Girl Reading"

    (AFP)

    Working like a team of detectives, Delaney, Jackall and Swicklik studied a tiny cross-section taken from the painting in the 1980s -- the traditional way of observing paint layers -- along with three different types of scientific imaging, without ever touching the work.

    "You start off this research not knowing what you're looking for," said Delaney as he demonstrated a scan of the canvas mounted on a mobile easel at the museum's chemical imaging lab.

    "But you collect many different kinds of information -- the canvas weave, the pigment types, the style of the painting, and then you start to see strange things."

    National Gallery of Art senior imaging scientist John Delaney shows XRF imaging spectroscopy of "Young Girl Reading" at the museum's chemical imaging labplay

    National Gallery of Art senior imaging scientist John Delaney shows XRF imaging spectroscopy of "Young Girl Reading" at the museum's chemical imaging lab

    (AFP)

    Delaney and co-researchers developed a pair of custom-built tools: a high sensitivity near infrared hyper spectral imaging camera and an x-ray fluorescence (XRF) imaging sensor.

    They also used techniques known as diffuse reflectance imaging spectroscopy (RIS) and reflectance transformation imaging (RTI), along with high-resolution color photography.

    Combined with four sets of carefully calibrated lights, the technologies produced more than 750 highly detailed images of the painting in very narrow wavelength ranges that helped create a realistic simulation of the original composition.

    During XRF imaging spectroscopy, mercury analysis clearly revealed the outlined "ghost" of the underlying woman, along with her plumed headdress adorned with pearls.

    The sketch is key Delaney shows a picture of "Young Girl Reading" and a simulation of the underlying painting based on technology that split up the image into spectral bands of just a few nanometers wideplay

    Delaney shows a picture of "Young Girl Reading" and a simulation of the underlying painting based on technology that split up the image into spectral bands of just a few nanometers wide

    (AFP)

    At the heart of the research was a faded sheet of paper on which the artist had sketched out 18 distinct thumbnail-sized portraits that corresponded to paintings associated with the fantasy figures.

    In addition to unlocking the mystery of "Young Girl Reading," the sketches also dispelled some long-held assumptions.

    Beneath all but the girl's underlying composition, Fragonard made inscriptions that for the first time associated the portraits with names, though it is still unclear whether they identify patrons or the sitters themselves.

    The annotations named previously unidentified portraits for some, revealed mistaken identities for others and left out paintings long considered part of the series.

    What had been celebrated as an iconic image of Enlightenment philosopher Denis Diderot -- a ruthless art critic -- is now associated instead with writer Ange Gabriel Meusnier de Querlon.

    These and other related findings raise more questions than they answer. Four of the 18 works sketched out are still unknown.

    Yet more discoveries possibly await after Jackall curated the first known exhibition entirely devoted to the fantasy figures, running until December 3 at the National Gallery.


    Source: In France : Art 'detectives' probe what lies beneath a Fragonard

    Thursday, October 12, 2017

    5 things to consider before implementing iris scanning technology

    The eyes have it – or do they? Make sure your iris scanning is up-to-date and spoof proof

    In the 2002 sci-fi movie "Minority Report," Tom Cruise plays a futuristic police officer on the run who has eye transplants to conceal his identity from iris scanning. He also keeps his old eyes with him so he can log into the police network when needed. (This could actually work for a few days.)

    Today, police have access to handheld devices that can attach to a cellphone and collect and interface iris scans, facial recognition, fingerprints and identifying information.  

    This has largely occurred with little public debate or oversight. A look into these developments can help law enforcement plan its use of the evolving technology so as not to lose in the public arenas. This article addresses concerns about the technology's reliability. Another article addresses privacy concerns.

    Iris scanning is no longer science fiction. (Photo/Pixabay) Related articles Related content sponsored by UNDERSTANDING IRIS SCANNING TECHNOLOGY

    An iris scan takes a detailed image of the ridges in the colored part of the eye, usually through infrared photography. These genetically determined ridges are complex and unique. Their advantages over fingerprints include:

  • They are more sanitary, detailed and accurate.
  • They don't change with wear and tear.
  • They can be scanned and retrieved faster.
  • When someone's iris is scanned, a binary code of the image is created. It is this iris code of about 5,000 bits of data that is stored in a database. When that person later goes before an iris-recognition scanner, the iris is scanned and measured against the code in the database to authenticate identity.

    One such scanner developed by Biometric Intelligence & Identification Technologies (BI2) is called IRIS (Inmate Recognition & Identification System). Sheriffs and correctional facilities are using IRIS for purposes such as arrest, intake and booking, visitation, work release, etc.

    BI2 says its iris recognition technology requires conscious participation. The subject must present their eye to the camera within a designated capture zone approximately 10 to 18 inches away. 

    But iris scanning technology is fast evolving. Carnegie Mellon engineering professor Marios Savvides says he's invented the first long-range iris scanner, which can identify someone as they glance at their rear-view mirror before a police officer even gets out of the car, or while the person is moving. He demonstrates it in this video. 

    Technology to defeat iris scanners is also advancing. Hackers have been able to fool scanners using Google Images photos. Researchers have been able to create synthetic iris images not connected to real people that can fool a scanner. These images can be transposed onto contact lenses. As in "Minority Report," irises can be used as biometric identifiers for at least a few days after death.

    Dr. Leonard Flom, who shares the patent for the original iris scanning technique, is also countering the fakers. Some of the foils, he says, can be defeated by a simple pen light shone in the eyes, or a light and pupil reflex monitor in the scanner. Others are developing fake iris detection technology.

    Recently, researchers have reverse-engineered iris codes to create iris images that closely match the eye images of real subjects. This creates the possibility of stealing someone's identity through their iris code.

    THE PUBLIC DEBATE ABOUT IRIS SCANNING

    A 2016 Government Accountability Office's (GAO) report threw a critical spotlight on the FBI's Next Generation Identification (NGI) program which is amassing multimodal biometric identifiers such as iris scans, palm prints, face-recognition-ready photos and voice data, and making that data available to other agencies at the state and federal levels.

    One of the report's criticism was NGI's absence of reliability testing. Concerns include:

  • False matches can lead to serious problems, from mere inconvenience to wrongful detention or conviction.
  • Biometric identifiers, like SSNs, can be compromised by a data breach. Unlike other identifiers, however, biometrics can't be changed. Once they're compromised a person has no recourse, which can lead to identity theft, impersonation, or worse.
  • Data sharing exacerbates these harms – once faulty or wrongfully obtained biometrics are in a system, they spread everywhere the information in that system is shared.
  • CONSIDER AND PLAN
  • Educate yourself about the technology. Ask potential vendors: 

    a. Have your scanning algorithms been accuracy tested for "false negatives" (failing to find a match when one exists) and "false positives" (an incorrect match)? 

    b. What were the results? 

    c. Do you have fake iris detection technology – including "liveness" detection such as pupil reflex monitoring?

    d. What database do you use? 

    e. How big is it? 

    f. Who uses it? 

    g. What measures – like encryption – are in place to secure the database?

  • Require vendors to demonstrate target accuracy levels and prove an algorithm's submission to National Institute of Standards and Technology (NIST) accuracy tests.
  • Final contracts should require continued internal accuracy testing in operational settings and submission to all applicable NIST tests.
  • Avoid contracts where the vendor has disclaimed responsibility for the accuracy of the algorithm, even when the vendor uses a third-party algorithm. (See, recommendations by Georgetown Law Center on Privacy & Technology.)
  • Be prepared to respond to public concerns about "false matches." To put this in perspective, a 2012 report by NIST evaluated 92 different iris recognition algorithms by nine private companies and two university labs. Success rates ranged between 90 and 99 percent among the algorithms. These were false negative rates – failing to match – which don't negatively impact an individual like false positives. The false negative rate for iris scans is 10 times less than facial recognition. I was unable to find a specific false positive rate other than a description that it was "infinitesimally low." This might change if reverse engineering of iris codes expands beyond researchers.
  • Author's note: Thanks to Yavapai County Sheriff Scott Mascher and his Chief Deputy, David Rhodes. Both gentlemen are a gold standard of transparency and civic concern. With no pre-conditions, they opened their office and jail doors to answer all my questions about their use of iris scanning and to observe it during booking. Both expressed a genuine concern about indiscriminate use of iris scanning by police.

    About the author As a state and federal prosecutor, Val's trial work was featured on ABC'S PRIMETIME LIVE, Discovery Channel's Justice Files, in USA Today, The National Enquirer and REDBOOK. Described by Calibre Press as "the indisputable master of entertrainment," Val is now an international law enforcement trainer and writer. She's had hundreds of articles published online and in print. She appears in person and on TV, radio, and video productions. When she's not working, Val can be found flying her airplane with her retriever, a shotgun, a fly rod, and high aspirations. Visit Val at www.valvanbrocklin.com and info@valvanbrocklin.com
    Source: 5 things to consider before implementing iris scanning technology

    Tuesday, October 10, 2017

    5 dual camera smartphones to buy right now

    We are living in the age of dual cameras when it comes to photography with smartphones. Once considered the preserve of higher-end devices, dual cameras have become a mainstream feature, and you can now get a phone with dual cameras for as little as around Rs10,000. However, not all dual-camera set-ups are the same—more often than not, different devices may offer different features and functions. So which sort of dual-camera set-up should you opt for on your next smartphone? Here's a guide.

    Honor 8 takes a picture combining the output of both cameras—the monochrome sensor captures more detail in low-light conditions than the colour one, leading to sharper low-light images and less noise.

    Honor 8 takes a picture combining the output of both cameras—the monochrome sensor captures more detail in low-light conditions than the colour one, leading to sharper low-light images and less noise.

    Adding a touch of black and white

    This has two types of cameras in terms of output—one camera is a colour (or RGB) one and the other, monochrome (or black and white). This implementation of dual cameras in smartphones was made popular by Huawei, which has used dual cameras in its Honor 8 (Rs18,990) and Honor 8 Pro (Rs29,999) devices, as well as the P9 (Rs27,000) and the high-end P10 (Rs45,000) phones. The phone takes a picture combining the output of both cameras—the monochrome sensor captures more detail in low-light conditions than the colour one, leading to sharper low-light images and less noise. In some instances, users can use only the monochrome camera, enabling original and unedited black and white photographs which offer better detail and quality than one would get by applying a black and white effect or filter from an image-editing app.

    LG G6 uses the dual-camera set-up to either get you closer to the subject or capture a wider area (such as landscapes) without compromising on quality.

    LG G6 uses the dual-camera set-up to either get you closer to the subject or capture a wider area (such as landscapes) without compromising on quality.

    Zooming in or widening out

    In some phones, one camera is for "normal" pictures and the other, a telephoto lens that lets you zoom in (generally between 2-2.3x) without losing image quality. In some cases, the second camera is a wide-angle lens that allows for wider perspective. In some devices, one camera has a telephoto lens and the other, a wide-angle lens.

    The objective is to use the dual-camera set-up to either get you closer to the subject or capture a wider area (such as landscapes) without compromising on quality. This kind of dual-camera set-up is more prevalent in higher-end devices like the iPhone 7 Plus/8 Plus, the LG G6 (starting from Rs36,000), the Samsung Galaxy Note 8 and the OnePlus 5, although the Xiaomi Mi A1 also offers a telephoto lens—and at a remarkably affordable price

    Asus ZenFone 4 Selfie Pro.

    Asus ZenFone 4 Selfie Pro.

    Putting more into selfies

    In 2015, Lenovo was the first manufacturer to put dual cameras on the front of a phone (the Vibe S1). Since then, it has become a trend. But while the role of dual cameras initially was generally to provide a blurred background for a bokeh effect in selfies too, with one lens taking the picture and the other collecting depth information (as on the Vivo V5 Plus; around Rs22,000), a number of dual front-facing cameras, such as those of the Oppo F3 Plus (around Rs24,000) or the Asus ZenFone 4 Selfie Pro (around Rs23,000), have one camera for a "normal" selfie, while the other has a wide-angle lens to allow you to fit more people into what some are now referring to as "groupfies"—the idea of having a telephoto or zoom lens on a selfie camera clearly makes little sense since the camera is close enough to the subject in any case

    Samsung Galaxy Note 8.

    Samsung Galaxy Note 8.

    The Bokeh creators

    The most common function of dual cameras is where one camera takes a picture and the other "collects information" about the distances between different objects in the image. This allows the user to blur out part of the image while keeping another part in sharp focus, which is referred to as "bokeh" or "depth of field". Almost every dual-camera set-up claims to improve bokeh.

    The basic level consists of devices such as the Lenovo K8 Note (Rs12,999) and Micromax Evok Dual Note (Rs9,999), where one camera has a higher megapixel count than the other. The role of the latter is simply to calculate the depth of field in a photo. Phones like the iPhone 7 Plus (starting from Rs59,000) and iPhone 8 Plus (starting from Rs73,000), the OnePlus 5 (starting from Rs32,999), the Samsung Galaxy Note 8 (Rs67,900) and the Xiaomi A1 (Rs14,999) have special modes (called "Portrait Mode", "seems a stereo mode" or "live focus") in which one of the two cameras is dedicated to taking shots with the background blurred out.

    Matter of your ID...and emojis

    Trust Apple to put a spin on front-facing cameras. The iPhone X (starting from Rs89,000) has two cameras in front but the primary objective isn't just selfies. The 7-megapixel camera's real innovation is in the infrared camera that lies in the "notch" above the edge-to-edge display, called the True Depth Camera. Its role is to identify information captured by the infrared emitter located on the front, including face detection. The infra-red camera then creates a mesh of sorts to see how it compares with the user's face—and if it does, it unlocks the phone. The True Depth Camera also allows you to create emojis that reflect your facial expressions and enables classic "background blurring" (the bokeh effect), as well as "portrait lighting" which creates different light conditions for selfies.

    *Prices may vary

    First Published: Tue, Oct 10 2017. 04 49 PM IST


    Source: 5 dual camera smartphones to buy right now

    Monday, October 9, 2017

    Daisuke Yokota (sometimes literally) blazing a trail through photography

    As the Japanese star gets his first solo show in London at the Roman Road gallery, BJP revisits an interview with him on his destructive, constructive creative process

    The Mediterranean sun is suffocating; blistering hot and burning the skin. Standing in front of me, beads of sweat on his face and partially obscured by patches of black shadow, Daisuke Yokota is patient and motionless as I photograph him. Thirty-six frames later, the shoot is finished. "That was intense!" he exclaims softly, with a smile of complicity.

    We are in Arles, where in July 2016 he showed Mortuary, one of his signature sculptural installations, made up of heavily manipulated, elongated photographic forms. He had been selected for the Rencontres photofestival's Discovery Award, though in truth this cat had been long out of the bag – Yokota exhibited in Arles in 2015, showing his almost imperceptible inky-black prints from his Inversion series as part of Another Language: 8 Japanese Photographers, curated by Simon Baker of Tate Modern.

    And in the preceding half decade, his intriguing, visually arresting performances, experiments, installations, books, soundscapes and collaborations have blazed a trail from Tokyo to wider international acclaim, taking photography on a journey to the extreme.

    In this he is a revolutionary, with neither pretension nor timid creativity. The sheer energy with which he produces work is extraordinary, verging on obsessional and driven by a desire to constantly record, destroy and then recreate. Anxiety is the fuel. "In my mind, I have an image of burning energy in continual production," he says.

    "Often, my personality catches me in anxiety and frustration. If I stop, I will be stuck in a vicious circle of these feelings so I try to burn those negative thoughts and transform them into the energy for production."

    Daisuke Yokota, Untitled, 2015. Inkjet print on UltraSmooth Fine Art paper, 30 x 22 cm with frame, edition of 8. Courtesy of Roman Road and G/P Gallery. © Ollie Hammick

    Yokota emerged at a time when photographs and what they record have become lost in an infinite sea of imagery. His response is to destroy, in order to breathe fresh life into our understanding of the limits of photography. He reveals that the photograph is not static, but rather an unstable medium, uncertain and fragile in terms of its texture and meaning. Traditional notions of composition are no longer relevant.

    Six months later, on a freezing-cold day in Paris, I have an appointment at the studio of Yokota's French gallerist. Jean-Kenta Gauthier represents some of the most interesting and inquisitive photographers around, from Anders Petersen and Daido Moriyama to JH Engström and Raphaël Dallaporta.

    Here in his studio, laid bare on the table, is Yokota's book Matter (a 3D version of which went on show at Foam in Amsterdam this summer). It is extremely fragile, with radiant abstracted colours peppered with obscure figurative referents of solitary people. The pages are reminiscent of partially skeletal leaves, layered and cracked, coated with a heated wax.

    Though organic and accidental, they remind me of the perfect rendering of Gustav Klimt's gold leaf patterns – such is the vibrancy of their textured colours. This book is one of only 25 in existence, and considered an artwork by Yokota. Each is unique, handmade on paper that is almost transparent. They wax lyrical on destruction and rebirth, and on the endless regurgitation of matter as it morphs into other forms.

    "For Yokota, the process is very important, but this process is unified by layers on layers," says Gauthier. "This is how he physically makes work. First, he avoids selection – which is a fantasy for most photographers – and, without selecting the images, he coats the surface with wax. Applying heat to the wax, the pigment allows a transformation to happen. He gathered those pages, bound them and made a handmade book."

    His Inversion series realises similar thought processes, yet in markedly different form; obscured, inky-monochrome prints that are reminiscent of the black negative peeled and discarded to reveal a Polaroid. They are, in fact, solarisations taken from the pages of Matter, so that again new work is created from the source material, which in itself is taken from other source materials.

    Gauthier is wary of what he calls a "new orientalism" regarding representations of Japanese photographers in the press or in exhibitions, which have a tendency to patronise through perpetual stereotyping – a trace, perhaps, of imperialist romanticising of the 'other'. He also worries about a tendency towards the lazy categorisation of photographers that stifles comprehension and appreciation.

    But although I am sure he has been asked a thousand times before, I wonder if Yokota feels that there is some lineage carried from the Provoke photographers, especially to Daido Moriyama's seminal 1972 book, Farewell Photography.

    "I had that idea once, but I do not now," he says. "The situation is different now; there is no shared recognition or mainstream [notion] of 'photography' any more. Some images may look like Provoke but this is quite natural. Really, there is no philosophical meaning in making work in the same context. I believe it is time to reconsider photography detached from that understanding."

    Last December, the Berlin-based photobook publisher, Michael Kominek, invited Yokota, alongside other photographic artists Yoshi Kametani and Hiroshi Takizawa, to produce work that would culminate in books by each of them and also one collaborative book, as part of his newly founded, month-long residency programme. Kominek's role was to provide a framework and edit the output.

    "Earlier in the year I had organised a residency [the programme's first] with British photographer Antony Cairns, who brought with him an archive of photographs that he reworked," says Kominek. "But with Kametani, Takizawa and Yokota, they arrived with nothing, so as to produce fresh work from scratch of their experience in Berlin. They worked mainly at night. Yokota particularly enjoys photographing at night."

    Daisuke Yokota, Untitled, 2015. Inkjet print on UltraSmooth Fine Art paper, 30 x 22 cm with frame, edition of 8. Courtesy of Roman Road and G/P Gallery. © Ollie Hammick

    Kominek led them on nocturnal adventures, driving them around Berlin to night clubs, strip clubs, the fairground, a boxing match between German and Polish teams in Spandau (Germany won), and to the Liepnitzsee lake, where Yokota fell into the below-freezing water. "My life in Berlin became like a routine," says the photographer.

    "I woke up after dusk and went to bed in the morning. So I did the shooting at night, wandering the city. One month looked long at first, but it turned out to be very short in the end. It is tough to work in such a limited amount of time but I hope it will be more vivid work."

    Kominek has edited the results and produced the book, simply called Berlin. The process of this work is complex and idiosyncratic, employing unorthodox cameras, boiling the negatives during processing and reshooting the prints.

    Much of the process remains undivulged, for the secrets of an alchemist must be protected. To relinquish control is to be free from constraints, yet to harness the mistakes, appreciate the accidents and embrace the failures takes great concentration, confidence and, paradoxically, a large degree of control.

    Yokota's innate compulsion to make work was apparent in his first week in the German capital, when he fell ill and was unable to leave the apartment. His response was to set up an infrared camera in his bedroom and film his ghostly figure sleeping or glued to a laptop. Essentially, it is a recording of nothing – of empty time and space – but it somehow attains an eerie substance that recalls a film piece he made in a hotel room called Room 1.

    "The meaning of Yokota's work is in the process," says Kominek. "For me, the experience of witnessing and participating in the making of images was extremely enjoyable but, of course, it is always about the result, how it looks. Yokota is influenced by Gerhard Richter and Michael Schmidt, but to a certain degree he is free of politics – even though I would say that Berlin is similar in a sense to Schmidt's Waffenruhe in terms of apparent arbitrary subject matter. However, it is important also not to be restricted by being too intellectual, but to focus on just making."

    Daisuke Yokota, Untitled, 2015. Inkjet print on UltraSmooth Fine Art paper, 30 x 22 cm with frame, edition of 8. Courtesy of Roman Road and G/P Gallery. © Ollie Hammick

    The Berlin book is an array of scattered moments. Yokota adds ingredients to images by pulling and pushing and burning and heating, and in so doing distorts and shapes the subject of the photograph out of its original reference; thereby what is in the photograph is much less important than the prominence of the photograph itself as the object/subject. Meaning is obscured and sensation takes hold. It appears that mystery is constructed out of materiality and, although eclectic in transformation, Yokota is more akin to a sculptor than a photographer.

    Mortuary, using 20m rolls of photographic paper, has something of the anthropomorphic about it, of dead materiality. And when it was shown in Arles, Yokota brought in another interest – sound – to the installation, so that it amplified a very deep tone, causing vibrations that shook the inner body.

    "I used four rolls of Baryta paper of 108.5×2000cm," says Yokota. "My studio is very small, 4×5m, so I wanted to use this size paper but I could not do this for a long time. But I changed my idea to make the work reflecting the problem itself. My studio is not big enough to use the enlarger, so I used the sunlight to expose for the rolled paper.

    "Because the studio is small, it causes damage on the paper. Also, there are no containers that the paper can fit so there will be errors and mistakes in the development. I took advantage of these situations by not developing it in the correct way, not washing it much, or using sulphur to enhance the stains – to make a piece which can be physically felt and experienced."

    Gauthier recalls that the experience of constructing this work was painful for Yokota. "He remembered something as a child when he suffered an illness and fell into a deep fever," he says. "When a child has a fever, they have hallucinations, more than an adult will experience, and he remembered these weird visions he saw of a sphere of light and fire pushing through a black, obscure space. This memory returned to him only recently.

    "After some research, he discovered that this vision was common among many artists, and that they have produced work based on this vision. Herman Melville wrote Moby Dick using the whale as some kind of metaphor inspired by this vision."

    And so, despite the importance of the process, the question about Yokota's work so far is: 'What is its meaning?' "The process is about memories that become faded over time in the mind," says Gauthier. "Essentially, the memories change as they get mixed up with other memories."

    The photograph is a record of a memory and, by extension, Yokota's works are manifestations of latent recollections that emerge from the unconscious. They often address figuration and fragmentation through layering, but Mortuary began purely with abstraction. He conceived that photography is always about the surface but never about the body.

    "He wanted to consider that the paper is the flesh and what is on the paper is the skin, and through this metaphor, we enter into a deeper questioning of his own and our collective memory, and to also question photography itself," says Gauthier.

    "Both the process and the meaning are important," says Yokota. "But it is difficult to include the process in the image itself. In other words, if the picture was taken in a severe situation, it can record the severity. But photography never includes it. To include this process into the final output, I tried to maintain the textures, sounds and smells to give the physical feeling of the process."

    Daisuke Yokota, Untitled, 2016. Photographic emulsion on photographic paper, 200 x 109 cm (216 x 125 x 4 cm with frame), unique. Courtesy of Roman Road and G/P Gallery. © Ollie Hammick

    It follows Matter/Burn Out, his acclaimed book from last year documenting the destruction of the previous body of work, Matter, from which the 25 books were handmade. Matter was originally an immense installation of 100,000 photographic prints coated in wax and exhibited at the Aichi Trienniale.

    After an exhibition in Xiamen in 2015, the installation was burnt in a vacant space, like a funeral pyre, though whether this can be interpreted as a ritual, an execution or both is wonderfully ambiguous. The 'burn-out' process was documented in 4000 photographs and then these, having been processed and manipulated, were revived to form a new, large-scale work, of which some have made up the book.

    With all his energy speeding headlong, is he in danger of running out of fuel? His answer is modest. "I have a fear of that all the time. But if you look around there are so many extraordinary artists and, when I compare, I have done nothing. If I burn out now, I was not good enough."

    Emergence by Daisuke Yokota is on show at Roman Road gallery until 11 November www.romanroad.com jeankentagauthier.com gptokyo.jp This article was first published in the April edition of BJP, available from the BJP shop www.thebjpshop.com


    Source: Daisuke Yokota (sometimes literally) blazing a trail through photography

    Friday, October 6, 2017

    This Month in Physics History

    Infrared photography is an invaluable workhorse tool across many different scientific fields and practical applications, as well as a popular hobby among professional and amateur photographers. And we owe its existence — as well as that of ultraviolet photography — to an enterprising American physicist and inventor named Robert Williams Wood, best known in scientific circles for his research on optics and spectroscopy.

    Infrared radiation was discovered in 1800 by Sir Frederick William Herschel, best known for building telescopes and discovering the planet Uranus. Herschel painted the bulbs of three thermometers black, and then arranged them with one tip in the solar spectrum made by a prism, and the other two outside the spectrum to serve as controls. His first finding was that as he moved the thermometer across the spectrum from violet to red, the thermometer temperature steadily increased. His second was that moving the blackened thermometer just beyond the red end of the spectrum produced the highest temperature of all. This experiment was the first observation of light beyond the visible spectrum.

    Photography came into its own in the 19th century, but it was not possible to make pictures of anything in the infrared, because the chemicals used for early photography were not sensitive to longer wavelengths of light. Wood resolved that issue and thereby launched an industry.

    Born in Concord, Massachusetts in 1868, Wood initially planned to become a priest. But one night he observed an aurora and became fascinated by what might cause such a phenomenon. He thought the culprit might be "invisible rays," leading him to study optics instead. After earning degrees from Harvard, MIT, and the University of Chicago, he joined the faculty of Johns Hopkins University in 1901, where he remained until his death in 1955.

    Wood made waves early in his career with his infamous debunking of French physicist René Blondlot's claim to have discovered a new type of radiation called "N-rays." Unable to replicate Blondlot's results, Wood traveled to France in 1904 to observe the experiment firsthand. He removed a crucial prism from the apparatus between runs when the Frenchman wasn't looking, and when Blondlot still claimed to observe N-rays on the second run, Wood concluded he was deluding himself, and wrote a letter to Nature debunking the claim.

    The year before, in 1903, Wood invented an ultraviolet filter for photography, which he made from nitroso-dimethyl-aniline, combined with a small amount of a dye called uranine. This made the filter block visible light but transmit ultraviolet, and he used it to take the first photographs of ultraviolet fluorescence. The filter became known as "Wood's glass," and was the technology behind blacklight lamps. It also transmitted some infrared light, although very long exposures were required.

    Several of his photos appeared in the October 1910 issue of the Royal Photographic Society Journal, as illustrations for Wood's papers on the optical effects involved — including the so-called "Wood effect," which is the dreamlike appearance of photographs in the infrared. Infrared photographs feature a milky appearance to skin in portraits, and also dark skies — the Rayleigh scattering that makes the sky blue doesn't scatter much infrared. Also, the infrared wavelengths penetrate a few millimeters beneath the dermis, and then reflect back out of the skin, so they can image blood vessels within this thin layer.

    Wood didn't show much interest in profiting from his filters, even though during World War I, infrared-sensitive photographic plates were used for spectroscopic analysis. It wasn't until the 1930s that infrared film hit the commercial sector, when Kodak introduced the first emulsions designed for infrared photography. By the 1960s, the company offered 35mm false-color infrared film, and the popularity of infrared photography boomed — driven in part by its use in pop music album covers by rock stars such as Jimi Hendrix and Frank Zappa. The advent of digital cameras made physical films obsolete, and Kodak responded to the sharp decline in demand by discontinuing its 35mm infrared film products in 2007.

    While Wood's specialty was optics, he also made important contributions to the field of ultrasound. It started with a demonstration for his students to elucidate the wave nature of light by photographing the sound waves given off by an electric spark (a method invented by August Toepler). During World War I, Woods shifted to ultrasonics, and he worked in Paul Langevin's lab developing ultrasound for detecting submarines. By 1926, he wound up working with Alfred Lee Loomis to develop high-power ultrasonic sources. Their experiments revealed that ultrasound could melt the interior of an ice cube before the exterior, tear apart living cells, and kill frogs, mice, and small fish with just one or two minutes of exposure.

    Over his long and varied career, Wood also assisted in the investigation of the infamous Wall Street bombing of 1920, among other cases, and is often credited with the invention of tear gas. He spun the surface of mercury into a parabolic mirror and with it built a working reflecting telescope. In addition to scientific treatises, he co-authored two science fiction novels (The Man Who Rocked the Earth and The Moon Maker), as well as two children's books of nonsense verse. He died in 1955 in Amityville, New York.

    Today, infrared photography is used in the study of plant diseases, revealing changes in pigment or cellular material; in paleobotany; to enhance details of deeply pigmented tissues in photomicrography in the biological sciences; and by the textile industry to detect irregularities in fibers. It is also used in criminal investigations to examine and identify cloth, fibers and hair, and it's become a standard laboratory tool for imaging faded, damaged or altered documents. One hopes Wood would be gratified to see how ubiquitous his technique has become.

    Further Reading:

    Klotz, I.M. (May 1980) The N-Ray Affair, Sci. Am., May 1980.

    Seabrook, W. (1941) Doctor Wood, Modern Wizard of the Laboratory, New York: Harcourt Brace.

    Wood, R. (1903) On screens transparent only to ultraviolet light and their use in spectrum photography, Phil. Mag. 5, 257-263.

    Wood, R. (1910) Photography by invisible rays, Photogr. J. 50, 329.

    Infrared photoPhoto: Photogr. J. 50, 329 (1910)

    Infrared landscape image taken by Robert Wood

    Sound wavefronts photoPhoto: Nature 62, 349 (1900)

    Wood's photographs of sound waves


    Source: This Month in Physics History

    Thursday, October 5, 2017

    Psychedelic Photos From the Californian Desert

    Setting out for California, Melbourne photographer Kate Ballis wanted to capture a new side of this place she'd visited so many times before. To find something unexpected in the landscapes of Joshua Tree National Park and the midcentury resorts of Palm Spring that had become so familiar to her. So she turned to colour infrared photography, a technique that was once dying out as infrared film stocks dwindled but has been given new life through digital cameras.

    Kate's images are dreamlike, and yet, somewhat eerie. As though captured in some alien landscape where the sky has turned a sour pink and water a deep, blood red. The effect on plant life is perhaps most striking. Trees, grasses, and plants reflect infrared light much like the snow bounces visible light—and the colour they're rendered gives the human eye a glimpse into their health.

    Ahead of Infra Realism's launch in Melbourne on October 5, VICE talked to Kate about how she came up with the idea to shoot in infrared, mixing science and art, and where to next.

    VICE: Shot in infrared, these landscapes look incredible. How did you come up with the idea?Kate Ballis: I have been inspired by infrared photography since I saw Richard Mosse's show at the Venice Biennale in 2013. His work was filmed and photographed on traditional infrared film. There's very low stock of infrared film left in the world, and I'm used to the process of shooting digitally—especially when travelling—so a converted infrared camera sounded like the perfect tool for my trip to Palm Springs in February.

    What feeling were you trying to capture in this series? The images feel almost... eery.I guess I started out wanting to create the feeling of another world by showing a spectrum of light that is otherwise invisible to the human eye, but I was even a little fearful of the bold colours that the foliage goes when photographed using an infrared camera and filters. But as I was playing around with filters and techniques, I developed something that to me was so distinctly 80s California that the series quickly fell into place, and the colour scheme began to dictate subject matter.

    Does infrared photography always look this 80s or did you set out to craft this distinctive look?Traditional infrared film made foliage look pink or white. You can now use lots of different filters to make the plants different colours, dependent on different white balances. Each responds to the infrared spectrum differently.

    You mentioned that plants give off really bold colours under infrared photography. What's happening there, what are we seeing?It depends on the infrared filter. The healthier the plant, the more colour it gives off. It's so interesting seeing super healthy plants in the middle of Palm Springs, which is a desert and can reach 50 degrees celsius.

    I think when you look at your images, they are so distinctly California—even with the distorted colours. Is that one of the things that drew you to shooting there?Palm Springs is pretty much a second home. I've been there eight times in the last four years, and am heading back in a few weeks. I actually ordered the camera directly to my friend's house in Palm Springs, so hadn't played around with it until I got there. All I knew is that I wanted it as a tool to show California, and especially Palm Springs, in a new light. However, when I created this colour scheme I couldn't get over how it seems so iconically 80s California, and so perfectly fitting for poolside Palm Springs. The fact that the colour scheme is so familiar it can almost be used as a code to interpret what would otherwise be a distorted and challenging landscape.

    Do you think you'll keep shooting in this style, or are you keen to try something completely different?I have continued shooting in this style across the Atacama Desert in Chile, and also Bolivia. I'm shooting in Palm Springs and some other US National Parks later this month, which will all come together in a book to be released next year! Next year I want to explore England and Greece—my heritage—so we'll see how those landscapes respond to infrared. I'm all about storytelling, I like to find a photographic or artistic style that best fits the story. So who knows what will come next!

    "Infra Realism" will be exhibited at Jardan in Melbourne until 18 October. See more of Kate's work here


    Source: Psychedelic Photos From the Californian Desert

    Wednesday, October 4, 2017

    18 essential wildlife photography accessories

    Shooting wildlife isn't only about the right camera and lens combination.

    Amateur Photographer has compiled a list of 18 wildlife photography accessories that could help you take home the perfect shots, every time.

    1. Camouflage Tape

    Camouflage Tape

    Many wildlife subjects are easily scared by the unfamiliar, and the only way to photograph them is to stay quiet and hidden. Camouflage tape is a great way of keeping your kit inconspicuous – for example, it can be used to cover items such as tripod legs and lens hoods. Various patterns are available from the likes of Mossy Oak and Stealth Gear, and cheap generic products can easily be bought online, too.

    2. Linpix Photography MatLinpix Photography Mat

    Sure, it's not the most exciting wildlife photography accessory you'll find, but it might just be one of the most practical. Measuring 75x135cm, the Linpix Photography Mat is made from 300-denier polyester with a damp-proof backing. It'll keep you dry on those occasions when you need to lie down on the ground to shoot inconspicuously or from low angles.

    3. Dome Hide C30Dome Hide C30

    The Dome Hide C30 provides a waterproof 1.3m-high enclosure in which you can conceal yourself and your gear. It offers more comfort than covering yourself with scrim netting, and some freedom to move around and select your camera kit. The C30 is available in four different printed patterns to match your shooting environment.

    4. Kenko Teleplus DG AF extension tube setKenko Teleplus DG AF extension tube set

    Extension tubes act as an inexpensive, lightweight alternative to a macro lens: they fit between a lens and a camera body to reduce the minimum focus distance, enabling close-up shooting with practically any optic. Because they don't contain any glass, they have little effect on sharpness, although with slow lenses on DSLRs the viewfinder can become distinctly dark. This Kenko set is available for Canon, Nikon and Sony Alpha mounts, and maintains electronic connections between the lens and camera, enabling autoexposure and autofocus.

    5. WD MyPassport Wireless ProWD MyPassport Wireless Pro

    If you're out in the wilds on a shoot, you probably won't want to lug around a laptop, but chances are you will want to back up your pictures. The WD MyPassport Wireless Pro is the best solution we've come across to date, with storage options ranging from 1TB to 4TB and a powerful built-in rechargeable battery. Pop in your SD card, press the copy button and it'll back up your photos with no fuss.

    6. Manfrotto MPMXPROC5 monopod Manfrotto monopod

    Monopods are ideal for supporting heavy telephoto lenses, while also leaving you mobile to track your subject. Manfrotto's latest XPRO monopods are lightweight yet strong, and use quick-to-operate lever leg locks. They come in four or five sections, and a choice of aluminium or carbon fibre.

    7. Manfrotto 3N1-36 PLManfrotto 3N1-36 PL

    Many wildlife photographers use pro DSLRs with big lenses that require large, strong bags to carry them around. We've been particularly impressed by this Manfrotto backpack – it's deep enough to hold a DSLR with vertical grip, and its heavily padded back means it is comfortable to wear, no matter how heavy.

    8. Op/Tech RainsleeveOp/Tech rainsleeve

    Wildlife photographers often find themselves outdoors in inclement conditions, so they need to be able to look after their kit. One of the most essential of our list of wildlife photography accessories is this rain cover. Heavy-duty rain sleeves are available, but for occasional use Op/Tech's Rainsleeve is an ideal way to protect your camera and lenses from rain and dust. A pack of two costs less than £8 and each should be durable enough for several shooting sessions.

    9. ThinkTank Photo CF/SD + Battery WalletThinkTank Photo wallet

    Animals are unpredictable, so the last thing you want is to find yourself scrabbling around in your bag for a spare battery or memory card when the action kicks off. This simple accessory holds a battery on one side and a memory card on the other, and can be slipped into a pocket or clipped somewhere accessible.

    10. PNY Outdoor ChargerPNY Outdoor Charger

    PNY's Outdoor Charger is unusual in that it's designed to be used in more challenging environments, with dust and water resistance to the IP65 specification. With a 7800mAG capacity and 2.1A output, the device packs plenty of juice, and the icing on the cake is a built-in LED flashlight.

    11. Tilley T3 Cotton Duck hatTilley T3 cotton duck hat

    Hats don't get better than the Tilley T3. Made in Canada, it has a lifetime warranty against faulty materials or just normal wear and tear. Be sure to heed Tilley's instructions on choosing the correct size.

    12. Páramo Halcon JacketParamo Halcon Jacket

    Super lightweight, and able to cope with up to four hours of rain, the Páramo Halcon Jacket is a versatile option that's ideal for spring, summer and autumn use. It uses soft, breathable Nikwax Analogy waterproof fabric, which crucially is quiet and rustle-free, so shouldn't scare off the wildlife when you move.

    13. Sirui W1204 waterproof tripodSirui W-1204 Tripod

    To support long lenses most effectively, you need a sturdy tripod, but it's still got to be light enough to carry to your location. Sirui's W1204 is a beautifully made, fully featured carbon-fibre tripod kit, and includes waterproof twist leg locks so you can set it up where other similarly priced tripods would fear to tread.

    14. MacWet glovesMacWet gloves

    Manufactured from thin, high-grip material, MacWest's hand-hugging design means that these gloves are extremely popular for a wide range of outdoor pursuits. Made of a thin polyamide and polyurethane material, operating a camera is easy, whether via button controls or a touchscreen.

    15. MindShift Gear UltraLight Dual 25LMindShift Gear Ultralight Dual 25L

    If you're trekking some distance, it's useful to have a dual-purpose backpack that can hold not just your camera gear, but supplies and waterproofs too. Very lightweight, the MindShift Gear UltraLight Dual 25L is water resistant, thanks to external and internal coatings, and a waterproof cover is included. The separate camera module can hold a DSLR with a large zoom, while the main compartment has plenty of space for other possessions.

    16. Wildlife Watching Supplied C14.3 Standard Double Beanbag (inc liners)Wildlife Watching Supplies double beanbag

    Beanbags are perfect for supporting cameras with spotting scopes or long lenses. The C14.3 Standard Double is a particularly fine example. Designed to support lenses up to 600mm, it is constructed using extra-strong thread and double stitching.

    17. Pluto TriggerPluto trigger

    Sometimes, triggering the shutter manually just won't do. The Pluto Trigger has a huge range of remote-triggering options, both on its own and when used with a smartphone. It connects to a smartphone via Bluetooth, and to your camera using interchangeable cables that are available for most brands, and it can work as an infrared release with compatible cameras. The trigger unit has several built-in sensors, including for sound, light, and proximity. There's even a laser trigger.

    18. Walkstool ComfortWalkstool Comfort

    Shooting wildlife can involve a lot of patience and staying in one place, so some sort of portable chair can be handy. The Swedish-made Walkstool Comfort is far from being the cheapest option out there, but it stands out due to its two-section telescopic legs that make it taller and more comfortable than most, while still being lightweight and portable. It's available in four sizes of various heights, so make sure you get the right one.


    Source: 18 essential wildlife photography accessories