Save bits! The standard XML gif folks use is 429 bytes. My 32 colour version is only 307 bytes, but looks the same. The images on the right show the original, mine, and the differences. Probably all a wash given HTTP overhead, but why not avoid wasting bits?

Props to Jef Poskanzer for the pbmplus tools: 13 year old command line tools, still the best way to edit images.

pnmarith -difference xml-orig.ppm xml32.ppm | pnminvert | pnmscale 3 | ppmtogif > difference-big.gif

32 Colours


  2003-02-15 19:54 Z