lossless PNG optimizer
OptiPNG is a PNG optimizer that recompresses image files to a smaller
size, without losing any information. This program also converts
external formats (BMP, GIF, PNM and TIFF) to optimized PNG, and performs
PNG integrity checks and corrections.

Maintainer: Kyle Isom <kyle@tyrfingr.is>

WWW: http://optipng.sourceforge.net/
