The sng program translates between PNG (Portable Network Graphics) format and SNG (Scriptable Network Graphics) format. SNG is a printable and editable minilanguage for describing PNG files. With sng, it is easy to view and edit exotic PNG chunks not supported by graphics editors; also, since SNG is easy to generate from scripts, sng may be useful at the end of a pipeline that programmatically generates PNG images. WWW: http://sng.sourceforge.net