My name is Bob Hanson; I'm the principal developer of Jmol. Jmol can export images in a variety of ways including GIF and animated GIF. But of course GIF only allows 256 colors, and I used to think that was the end of that. Forget that. But then one of our users pointed me to how well GIMP creates GIF images using the Floyd-Steinberg dithering algorithm, so I decided to give that a try. And I was delighted with the results. (Had some fun just playing with that -- see my 216-color solution at http://chemapps.stolaf.edu/jmol/test/dither.htm . The solution was to 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. 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. Bob Hanson -- Robert M. Hanson Larson-Anderson Professor of Chemistry Chair, Department of Chemistry St. Olaf College Northfield, MN http://www.stolaf.edu/people/hansonr If nature does not answer first what we want, it is better to take what answer we get. -- Josiah Willard Gibbs, Lecture XXX, Monday, February 5, 1900 _______________________________________________ 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
