Few hours ago I wrote about image optimization with Jpegoptim. Now I'll write few words about Optipng, a PNG and GIF optimizer.
OptiPNG is a PNG optimizer that re-compresses 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. If you wish to learn how PNG optimization works, or to know about other similar tools, see the PNG-Tech article A guide to PNG optimization.