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Are you trying to create a formula or function for use in the spreadsheet? It's been ages since I touched one.
Maybe it's a case of using the IF/THEN syntax?
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Can you simplify the example and or provide more details, steps, screenshots on how this applies to Photoshop etc?
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You paint a color, let it dry and paint above it. By taking photos you know the resulting RGB as well as the RGB of the 2 original colors. Could you by knowing the 'combined' (though its not color mixing) and one of its original colors RGB get the 2nd RGB? The other colors RGB I already know its the process I want to find out. What's the relationship (for eaxmple could it be something simple like combined - one = the other ? )
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RGB is additive, so what does this have to do with paints on paper (or other substrates)?
»By taking photos you know the resulting RGB as well as the RGB of the 2 original colors.«
A camera is not a spectrophotometer so whatever RGB-values it would produce in whatever RGB-space under whatever lighting conditions may be less meaningful than you assume.
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Agreed all precautions were taken so that all photos where taken in same (as mmcu as possible) enviroment / conditions