coming in late on this - but it sounds a lot like a problem i ran
into a while back trying to do a mosaic on the fly with php and
imagemagick. i just ended up creating a custom color palette (or a
GIF with that as its color palette), reducing the source image to
~32px x 32px and dithering the source image into a GIF using
imagemagick. php was able to read the values of each pixel and render
the right color block for the mosaic.
what bearing all this has on QC is negligible, of course, but it may
be possible, rather than trying to match colors for areas of your
source image, to find a way to downsample it in size and dither to
your 12 colors by converting to a GIF with a pre-set color palette.
from there, you've just got individual pixels to deal with rather
than blocks of variable color.
my 2ยข
take it or leave it.
charles mangin | Alpha Geek and Chief Mental Hygienist
[EMAIL PROTECTED]
http://mentalhygiene.com
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