Dan Connelly wrote:
> 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.

POV-Ray can already create 48-bit PNG images. You could post-process that to
generate a dithered 24-bit image.

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