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On Sun, 11 Nov 2001 08:02:17 -0500, John David Haiducek
<jha### [at] engin umich edu> wrote:
>I had thought that Photoshop's "Lighten" mode did addition. Am I wrong
>about that?
If layer A is above layer B, then for a pixel [x,y]:
f_lighten(A,B,[x,y]) = (lum(A,[x,y])>lum(B,[x,y]))?A[x,y]:B[x,y]
If you want to do addition, try screen mode or image/channel
composition.
Peter Popov ICQ : 15002700
Personal e-mail : pet### [at] vip bg
TAG e-mail : pet### [at] tag povray org
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