12-01-2010, 05:42 AM
I've been using this program from a couple of months and before that I used the paid version of this called PNGOutWin for about two years for both RPG Maker and my websites. Both are GUI version of Ken Silverman's PNGOUT command line program. It takes out any extra information in a png file that isn't image data and then optimizes and compress the actual image data without any loss of quality. Using this I've been able to make some PNG up to 75% smaller though the percentage varies.
Download:
http://benhollis.net/software/pnggauntlet/
Download:
http://benhollis.net/software/pnggauntlet/