I thought about this problem before -- the main issue is that the
anti-aliasing causes a lot of "extra" colours to be created.

The original colour reduction algorithm was to find the first 256
colours in the image and use those colours in the colour map.  This
completely failed to work after antialiasing was turned on - images
went from 16 colours to 6,000!

Most paint programs will tell you how many colours an image is using,
and you can turn antialiasing on and off.

The second problem is how to deal with transparancy, esp since
antialiasing afects transparency.

dave

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