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.

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