[mapguide-users] patch for Ticket #743 / png8 transparency

[Jackie Ng]

Unless I got this PNG8 quantization business all wrong, if the resulting
image would use < 256 colors then there shouldn't be a need for the
quantizer to compute a palette is there? Just take this list of colors that
we've extracted out of all the Layer/Symbol Definitions and let the PNG8
quantizer "fill in the blanks" up to the 256 colors.

If we have defined these colors in our Layer/Symbol definitions, I think
they should be respected if the total number of colors used < 256.

- Jackie



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