I think that http://pngquant.org/ http://pngquant.org/ does the same technique. Also see http://pngnq.sourceforge.net/index.html http://pngnq.sourceforge.net/i

I think that http://pngquant.org/ http://pngquant.org/ does the same technique. Also see http://pngnq.sourceforge.net/index.html http://pngnq.sourceforge.net/index.html There are several other image optimization tools incorporated into a OS X tool http://imageoptim.com/ http://imageoptim.com/