Just a final word of thanks for the tips and suggestions relating to color quantization. Today I successfully implemented in Jmol and JSmol Floyd-Steinberg dithering and color quantization.* The implementation is quite different from GIMP's in the end, but the results are nearly identical. I'm sure GIMP is faster; I didn't aim for speed optimization, just acceptable results. Many thanks. Bob Hanson * As far as I can see, at least in GIMP 2.8.0-RC1 app/core/imageconvert.c, the code for median cut is commented out, and what GIMP actually uses is just the average of highest and lowest values in a box, not the median. Unless I read that wrong, which is quite possible.... _______________________________________________ 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