

"m@b" <sai### [at] googlemailcom> wrote:
> But I would need some primitives to put the pattern on?
Of course. A thin box or the union of 2 triangles works well. A plane if you
just want to have the largest possible palette.
But the idea is that you have a lot of stuff going on after you "extract" the
colors. Rather than do that, you use the color values directly to select a
pigment, by using a pigment_map.
I am curious about
#declare GreyTest = 0.001 + abs(TestK(X,Y,0) 
abs((TestR(X,Y,0) + TestG(X,Y,0)  TestB(X,Y,0))));
What is the underlying logic/reasoning behind this "greyness test"?
> > there are edgefinding algorithms that give you the gradient of the image as a
> > bonus.
>
> Hmm  I need to think about these things. Interesting suggestions.
https://www.youtube.com/watch?v=uihBwtPIBxM
skip to 3:30 if you want.
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