SNG enables you to decompile PNGs into an information-preserving .sng text format that you can hack with a text editor. Then you can recompile the .sng back to a .png -- handy if you need to add or edit some obscure ancillary PNG chunk that your graphics tools don't understand. Also handy if you want to generate PNGs programmatically using text tools.
Release Notes: This release finds newer locations of the rgb.txt file and was adapted for altered extension handling in recent libpng versions.
Release Notes: This release now supports libpng 1.0.8/1.0.9, a -V option has been included, and a fix for an off-by-one allocation error that was causing segmentation faults has also been implemented.
Release Notes: Forward-ported so it will work with the experimental 1.1.0c version of libpng.