Warp wrote:
>   This sounds like something you could write with a generic post-processing
> script (which future versions of POV-Ray should and will most probably
> support).
> 

I thought dithering had to know the exact value of a color so, for constant color, it
could cycle between discretized colors with a weighting depending on how close the
actual color is to each.  (for graded colors, it's slightly more complicated).  This
can't be done post-processing, by which point the precision has already been lost.

Dan

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