Shooting for Colormetric Accuracy of Fine Artwork

Good Morning,
I have been shooting pieces of artwork for my clients with a 5D mk2 and have been striving for better color accuracy. I have been using the Colorchecker to generate DNG Profiles for the camera in my studio. When I open images in ACR and I set my tonal values to specific values to match the chart I get drastically different numbers on the info pallete in PS CS5 than on the tone curve in ACR. I do have Photoshop set to use ProPhoto RGB in 16bit. Why is this happening and how can I solve this?
Thank you,
Brandon

Well, my knowledge about color science and color management is actually quite limited. Someone with better knowledge about this relatively complex subject would probably give you better or more accurate advice than me
From what I know, typical workflow with digital camera is to transform a capture of the scene to an image that would be displayed on the monitor or printed on the paper. Since dynamic range and color gamut of the scene is usually way larger than of the monitor or paper, image has to be severely tweaked ("rendered") to get pleasant result, while colorimetric accuracy is not very important. This typically involves compressing of the highlights with a tone curve and and some changes of hue and saturation with a big 3D lookup table (+ whitebalancing and changes of color space)
If I understand correctly, what you need is to use your 5D as a kind of scanner, to accurately capture a "scene" that is already on the "output media" with limited dynamic range and color gamut and under controlled lighting. So, these rendering tweaks have to be relatively small, just to compensate for some nonlinearity in the whole process. In other words, tone curve of the whole process should be close to linear and lookup table mustn't introduce huge hue/saturation/brightness shifts
To get linear tone curve of the whole ACR pipeline, you need:
- profile with linear tone curve
- ACR settings: brightness +50, contrast +25, tone curve = medium-contrast
- about blacks slider, default value is said to be +5, while my experiments shown me that it has to be 0, so I'm not sure
- other sliders like saturation, vibrancy, recover, fill light etc should be 0

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The below text includes what was going to be the post until I think I answered myself. I left it in as it is relevant to the problem above and includes what I hope to be correct statements. If you are tired of reading now, just stop, if you are bored, feel free to comment on the below section as well.
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Project Engineer
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Run LabVIEW on WinXP and Vista system.
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Seebeck EMV needs temperature gradients , in your relays you hopefully have low temperature gradients ... however in a switching contact you can have all kind diffusions and 'funny' effects, keeping them on same temperature is the best you can do.
Since you work with a multiplexer and with TCs, you need a good Cold junction ( for serious calibrations at 0°C ) and there is the good place for your short cut to measure the zero EMV. Another good test is loop the 'hot junction' back to the cold junction and observe the residual EMV. Touching (or heating/cooling) the TC loop gives another number for the uncertainty calculation: the inhomogeneous material of the TC itself..
A good source for TC knowledge:
Manual on the use of thermocouples in temperature measurement,
ASTM PCN: 28-012093-40,
ISBN 0-8031-1466-4
(Page1): 'Regardless
of how many facts are presented herein and regardless of the percentage
retained,
all will be for naught unless one simple important fact is
kept firmly in mind.
The thermocouple reports only what it "feels."
This may or may not the temperature of interest'
Message Edited by Henrik Volkers on 04-27-2009 09:36 AM
Greetings from Germany
Henrik
LV since v3.1
“ground” is a convenient fantasy
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Shooting for Colormetric Accuracy of Fine Artwork

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