Le 07/07/2016 19:39, Bald Eagle a écrit :
> (I'm assuming that Vector.gray = (Vector.red + Vector.green + Vector.blue)/3
> and that would be a helpful tidbit in the docs as well. )

Sorry to disappoint you, but gray formula is more complex (the weight of each of the 3
components are different)

It is documented at least in
http://wiki.povray.org/content/Documentation:Tutorial_Section_3.2

but it might be useful to repeat it in the "Colour_Expressions" page.

gray value = Red*29.7% + Green*58.9% + Blue*11.4%

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