Editor: Pngrewrite is command-line utility that reduces the unnecessarily large palettes that some programs write into PNG files. It also optimizes transparency data, and reduces the bits-per-pixel if possible. Handy for post-processing PNG files before putting them on a web site.
It can probably run on most any platform on which libpng can run. A Windows version is included. For other platforms, you'll have to compile it yourself.
