Package sng

Lossless editing of PNGs via a textual representation

http://sng.sourceforge.net/

SNG (Scriptable Network Graphics) is a minilanguage designed
specifically to represent the entire contents of a PNG (Portable
Network Graphics) file in an editable form. Thus, SNGs representing
elaborate graphics images and ancillary chunk data can be readily
generated or modified using only text tools.

SNG is implemented by a compiler/decompiler called sng that losslessly
translates between SNG and PNG.

General Commands
Command Description
sng compiler/decompiler for Scriptable Network Graphics