On Fri, 29 Sep 2000 19:24:45 +0200, Vahur Krouverk wrote:
>Why not use "associated alpha" approach instead, which is used in
>RenderMan (R) renderers (shaders actually): it premultiplies opacity
>with color and outputs "dimmed" colors. 

This is exactly what povray does with a black background, if I
understood the discussion correctly. The problem is that this is wrong
for PNG files, which require non-premultiplied RGB values (See RFC 2083,
Sections 2.4 and 12.8).

	hp

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|_|_) | Sysadmin WSR       | vor dem rechner.

__/   | http://www.hjp.at/ |       at.linux, 2000-09-24

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