Would you like to give me values for 'correct/best' conversion from rgb to
grey value without looking into POV sources ? I have found at least 3
different versions of this conversion in POV sources and searching Internet I
found even different. I have connected in PoPOV all occurences of such
conversion into one define. Not convertable cases I have connected with unique
constants. Now I'm not sure they use correct values...

ABX

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