Color shifts using QUANTIZE_COLORS=256

[rich.fromm]

tbonfort wrote:
> 
> Mapserver relies on a gd library function to do the actual
> quantization, so there's little we can do about the color shifting
> you're experiencing
> another solution is to use a precomputed palette
> 

As I mentioned in another posting, your workaround (also suggested by
Stephen Woodbridge) works fine for my needs.

Nevertheless, do you feel that this is a GD bug that ought to be reported to
them?  I suppose it depends on your precise interpretation of what
quantization should do under certain circumstances.  But in this case as
applied to image processing, I'm inclined to think that if I only request a
single color and a quantization limit of 256 colors (or really any request
<= 256 colors in this case), that the color(s) requested should be returned
without modification.

- Rich

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