I've improved the GIF file output again.
1. The colour reduction code was taking too long, so i told it to only
sample every-other-pixel. This shouldnt cause any real problems, but
tell me if you see anything "funny" happening. Its much faster.
2. I improved the transparency handling - now the "transparent colour"
is completely separate from the other colour processing. This makes a
big difference if your "background" colour is the same as a colour that
you draw with.
3. The only real todo is the fact that it always produces 256 colour
GIFs - even if fewer colours are actually used. In general, that
means that the output file is a wee bit larger than it needs to be.
dave
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