clipka <ano### [at] anonymousorg> wrote:
> POV-Ray does not support paletted image output in any format; the reason 
> is that there are plenty of different ways of choosing a suitable 
> palette, and plenty of different ways to dither the image, each with 
> their own strength and weaknesses, so we leave that job up to image 
> processing software as a post-processing step.

  In fact, calculating the optimal palette and dithering for a given
image is an extremenly difficult problem, and tons of papers have been
written about the subject. (It also depends on your definition of
"optimal". It's not unambiguous.)

-- 
                                                          - Warp

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