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Thread started 01 Dec 2006 (Friday) 02:59
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Color Management

 
tzalman
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Dec 01, 2006 02:59 |  #1

I have just read a very interesting article that appeared recently on the Luminous Landscape site.
http://www.luminous-landscape.com …s/whats-the-problem.shtml (external link)

Here are a few excerpts:
Color only exists in the human brain.
It is more important that the media be consistent and produce pleasing color, rather than producing accurate color

So What Did I Learn About Digital Photography?
1. A film camera can output a transparency. The film manufacturer controls the color. A digital camera outputs a digital file full of numbers. Those numbers do not become color until you image them on a monitor or printer.
2. Inside the digital camera there is RAW output from the sensor. A processor in the camera then converts it from RAW to some standard color space and outputs a file. It only becomes color when that file is imaged on an accurately calibrated and profiled monitor or printer. Given this, it has always bothered me when a person reviews a new camera and comments on the color that the camera, alone, produces. Digital cameras do not output color. Cameras are only the first link in the chain.
3. The good news is you can adjust everything. You should think of a RAW file as a latent image on film. You can control the development, the gamma, the color gamut, and the tonal mapping. You can emulate almost any film or create a whole new look. You can get either pleasing color or fairly accurate color.
4. The bad news is you can adjust everything. To get what you want requires a considerable amount of new knowledge and skill.
5. A digital camera or scanner does not have a color gamut.
6. There is no such thing as “Push button color”. Color in the final analysis is a subjective experience in our brains and we all don’t see it alike. The best we can hope for from of a color management system is that it be consistent.

My problem is with statement 5. I don't understand how a camera can not have a gamut of colors that it is able to perceive and record. Can anybody help me out?
Elie


Elie / אלי

  
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PhotosGuy
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Dec 01, 2006 10:25 |  #2

4. The bad news is you can adjust everything.

:D That one should be in bold type? ;)

I don't understand how a camera can not have a gamut of colors that it is able to perceive and record.

I have no idea what they mean, & generally don't care? I didn't know or care what the dyes they used in film were, either? To me it's meaningless measurebating, relevant only to the sensor designers.
Shoot & be happy.


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drparker
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Dec 02, 2006 00:25 |  #3

I think what they mean is that the sensor does not have a gamut. It measure light intensity on sites covered by colored filters. Software takes those intensities and translates them into color and maps it to usually sRGB or Adobe RGB.


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SkipD
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Dec 02, 2006 06:13 |  #4

tzalman wrote in post #2337446 (external link)
2. Inside the digital camera there is RAW output from the sensor. A processor in the camera then converts it from RAW to some standard color space and outputs a file. It only becomes color when that file is imaged on an accurately calibrated and profiled monitor or printer. Given this, it has always bothered me when a person reviews a new camera and comments on the color that the camera, alone, produces. Digital cameras do not output color. Cameras are only the first link in the chain.

The summary comment about this item is correct.

However, many people do convert RAW files without having a calibrated monitor to be able to accurately analyse the colors. Many people also print to a printer that is not profiled at all. My point is that the output from RAW conversion does become color without calibrated/profiled hardware, but the colors represented by the digital files may not be represented accurately by the monitor or printing system used.

The people who use uncalibrated/unprofile​d equipment are generally just lucky to get colors that are close enough to reality to satisfy them.


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PhotosGuy
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Dec 02, 2006 09:59 |  #5

The people who use uncalibrated/unprofile​d equipment are generally just lucky to get colors that are close enough to reality to satisfy them.

This might be a good time for these:

Monitor calibration
How do you calibrate your monitor?
https://photography-on-the.net/forum/showthre​ad.php?t=196318
Monitor Calibration
https://photography-on-the.net/forum/showthre​ad.php?t=158158

Dry Creek Photo: Using Printer Profiles with Digital Labs
http://drycreekphoto.c​om …sing_printer_pr​ofiles.htm (external link)
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Have you thought about making your own book? // Need an exposure crutch?
New Image Size Limits: Image must not exceed 1600 pixels on any side.

  
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Color Management
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