![]() Harnessing the power of the XYZ model allows us to take the relative values from some well defined RGB triplet and convert those into meaningful values across all colour spaces. Where three random RGB values with no metadata are meaningless, three XYZ values are always well defined and absolute. You can think of the CIE XYZ model as nothing more complex than another three light system, but with a concrete, scientific and absolute reference point. The latter is our means of discussing colour accurately and scientifically. The former means that without utilizing the latter, the values in an RGB triplet are meaningless. All colour is anchored in the CIE 1931 experiment and model known as XYZ.Without getting into the nitty gritty colour science stuffs, we need two bits of knowledge to ground ourselves: It is crucial to identify some sort of ground truth when discussing colour. What is a colour in a three light encoding model? This answer will not cover the complex notions behind albedos and other rendering nuances that are a part of this massive question. This is an answer that is long due in coming, and hopefully it will help elucidate some of the core concepts behind colour that might help in ascertaining a fleshed out solution. Cegaton has wisely hinted at the root of the discussion, which is that the framing and definition as to what is an accurate colour is a cause for much confusion and much misunderstanding. ![]()
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