optipng: optipng 0.7.7 (PNG optimization tool)
optipng:
optipng: OptiPNG is a PNG optimizer that recompresses image files to a smaller size,
optipng: without losing any information. This program also converts external formats
optipng: (BMP, GIF, PNM and TIFF) to optimized PNG, and performs PNG integrity checks
optipng: and corrections.
optipng:
optipng: https://optipng.sourceforge.net
optipng:
optipng:
optipng:

