Hi Robert On Tue, Oct 21, 2014 at 10:04:14AM -0500, Robert Hanson wrote: > http://chemapps.stolaf.edu/jmol/test/dither.htm . The solution was to This page seems to use JavaScript and WebGL, and so I'm not able to view it. It would have been better if you had sent a link to static images of the source and result. > partition red, green, and blue channels into a 6 x 6 x 6 color space, > allowing 216 colors in total. Not perfect, but amazingly good, I think. So you are doing FS dithering with a fixed uniform palette? > The problem comes when I have a small molecule with not too many colors. If > I go just over 256, then the FS algorithm cuts this down to something like > 64 colors. I'm wondering if I could get some advise as to how to optimize a > set of colors down to 255 colors without undershooting in such a dramatic > way while still using FS. You are looking for color quantization methods. You can find description of an octree method in Graphics Gems I. GIMP uses median cut. See https://www.cs.cmu.edu/~ph/ciq_thesis for Heckbert's thesis on median cut. Mukund
Attachment:
pgpO38F0nkdEM.pgp
Description: PGP signature
_______________________________________________ gimp-developer-list mailing list List address: gimp-developer-list@xxxxxxxxx List membership: https://mail.gnome.org/mailman/listinfo/gimp-developer-list List archives: https://mail.gnome.org/archives/gimp-developer-list
