Iliah Borg
  • Member for 7 years, 7 months
  • Last seen more than a month ago
How do I accurately and objectively capture the color of the setting sun?
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22 votes

But there is nothing objective about perception. If the goal is to attempt to reproduce the perception, the closest will be to set the white balance from a grey card which is not directly lit with the ...

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Got my first vintage lens (Carl Zeiss Jena Pancolar 50mm f/1.8) - what's this lever for?
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10 votes

This is the first, "zebra" version, optically the same design as Pancolar 2.0/50. The aperture control switch ("tumbler") should have 2 positions, "A" is counter-clockwise when looking at the front ...

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Is there a lossy compressed file format for 16-bit dynamic range images?
8 votes

JPEG2000, and you may also want to look at OpenEXR because it is supported by video hardware.

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Why are the colors so different in these two photos from different cameras even though I set white balance to the same temperature in Lightroom?
7 votes

Both white balances were set to a temp of 4150 and tint of +14 in Lightroom Same color temperature and tint does not mean the same white balance on two different cameras, even if the profile is set ...

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Effective viewing of Margulis' latest tome
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7 votes

I asked Dan to answer your questions. Here is what he wrote: "Anything prepared with color fidelity in mind is best viewed in a graphic arts viewing booth or, if none is available, sunlight or ...

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What's the resolution of the embedded JPEG preview in a Canon 7D MkII RAW image?
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6 votes

5472 × 3648 pixels at quality=81 One of the ways to check: exiftool -b -previewimage -w jpg canonraw.cr2 This will extract the preview from canonraw.cr2 file and write it next to the canonraw.cr2 ...

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What is development by inspection (DBI) and how is it done?
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6 votes

apply the fixer once you're happy with the result I actually use stop bath. I assume you can't use the same chemicals you'd use normally, right? I followed Jeno Dulovits on this, basically using ...

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How long will exposed film retain some latent image?
6 votes

You may have heard of negatives from the beginning of 20th century, processed just recently. Much depends on the type emulsion and storage conditions. I never tried it with colour negatives, but ...

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When to expose for the shadows vs expose for the highlights?
5 votes

ETTR is advocated so that you expose enough until you don't clip highlights That would be wrong without adding the word "important" or something similar, like in "don't clip important highlights". ...

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Paper ISO with no filtering
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5 votes

ISO (R) is not a speed number, it is log exposure range required to give the full tone (that is, full density range). The higher is the ISO R number, the softer is the paper. ISO R = 160 means density ...

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How can I find the the serial number of a Canon EOS DSLR when the stamp on the camera is unreadable?
4 votes

You can use free exiftool http://www.sno.phy.queensu.ca/~phil/exiftool/index.html exiftool -serialnumber YourOutOfCameraJPEG.jpg exiftool -serialnumber YourRawFile.cr2 or some exiftool-based ...

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Can I use a D.O. Industries Navitron 50mm f0.95 lens on a Nikon Camera?
4 votes

No, because the register (distance from the mounting flange of the lens to the sensor plane) is quite short.

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Problem with processing .CR2 format in Linux
4 votes

RawTherapee supports Canon PowerShot G16 starting RawTherapee version 4.2.

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Why don't cameras capture using the CIE XYZ color model?
3 votes

Currently XYZ filters are produced using thin film technology. It is not very cheap, and not very suitable for multi-megapixel sensors. It also results in somewhat spiky spectral response curves, ...

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Why is there a colour cast when using an incorrect white balance?
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3 votes

White balance is applied while processing raw data. The purpose of white balance is to reach R = G = B for neutral (grey, non-colored, achromatic) areas of the image. The whole problem arises from the ...

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How is the spectral response of a camera typically measured?
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3 votes

Here are some of the ways: http://www.image-engineering.de/iq-products/iq-tools/measurement-devices/camspec http://www.image-engineering.de/iq-products/iq-tools/measurement-devices/camspecs-express I ...

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Why are there two thin vertical lines through all of my photos?
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3 votes

A NEF file would be good to see before anything, but most probably you need to send the camera for servicing. If in USA, you can try https://repair.nikonusa.com/ProductEntry

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What is the benefit of a wide-aperture lens if you stop it down?
3 votes

Mr.Grum offered some very good reasons why faster lenses exist - because of fast and reliable focusing, and of easier framing and following due to brighter viewfinder. To add a little to what he said,...

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Why does Photoshop list more .icc profiles than Lightroom 5?
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2 votes

Lightroom v.5 can use only RGB profiles because all controls are working either in RGB or through RGB, it does not support CMYK. If you want to soft-proof to CMYK in Lightroom, try v.6.

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Why does raw to jpg conversion differ in different editors?
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2 votes

You can get different JPEGs from the camera, depending on the camera settings. In many ways, raw converters are like film developers. It would not be reasonable to expect exactly the same results ...

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Does white balance totally correct color shift due to lens glass or coating?
2 votes

The first question you ask yourself is what accuracy do you want. Normally you want to get into 6 to 2 deltaE range of accuracy, which does not stress the system too much. Splitting hairs, available ...

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Is a gray card sufficient to get accurate colors in a photograph?
2 votes

Grey charts are for accurate white balance. Accurate colour depends not just on the white balance, but also on the quality of the colour transform (colour profile) and its suitability for particular ...

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Right to use a photo taken at a Russian train station
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2 votes

Unfortunately, Russian regulations do not allow the use of images of any railway structure for commercial purposes, without permission from Russian Railways.

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Photoshop working color space choices
2 votes

The most commonly given reason against the use of ProPhoto RGB as a working space is that monitor gamut is much narrower, so there is no WYSIWYG when editing. Another reason is that ProPhoto RGB ...

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How can I remove brightness from the bottom of a concave plate?
2 votes

Usually a polarizing filter on the lens is enough, and if it is not, you can apply Krylon Dulling Spray http://www.krylon.com/products/dulling-spray/ http://www.amazon.com/Krylon-K1310-11-Ounce-...

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Sony a7: Is there more noise for ISO <100?
2 votes

The answer is not that simple, also because of the compression scheme SONY are using. Technically, between ISO 50 and ISO 100 all that is supposed to happen is exposure meter shift, 1 stop. That is, ...

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How can I see the photo settings like f-stop, ISO etc. of a image?
2 votes

Nikon have free Nikon ViewNX-i: http://www.nikonusa.com/en/Nikon-Products/Product/Imaging-Software/ViewNX-i.html

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Which EXIF tag to set for the 35mm equivalent focal length?
2 votes

Good practice is adding 0x920a Focal length 0x9205 Max Aperture Value 0xa405 Focal Length In 35mm Format (60D sensor active area has 26.82mm diagonal) 0xa432 Lens Info 0xa433 Lens Make 0xa434 Lens ...

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How to print profile targets using ColorSync Utility in Mac OS X Yosemite (10.10)?
2 votes

The workaround I use is assigning ProPhoto profile to the target and temporary assignment of the same profile as printer profile. In that case colour management does nothing.

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Losslessly batch convert many JPEGs to sRGB?
2 votes

As it was said, lossless is not an option here. To minimize losses throughout the workflow you can use ArgyllCMS. It is a free opensource pre-press quality library for colour conversion and other ...

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