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How can you detect color differences of variable sample brightness that are caused by illumination or distance?
 
You can get values by a feedback onto a color level, that doesn´t contain any information of brightness. This can occur e.g. by scaling one color port relating to accumulated signal of all 3 color ports. The standard colour value parts result from the standard color values X, Y and Z.

x = X / (X+Y+Z)

y = Y / (X+Y+Z)
 
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