SNG is a specialized markup language for expressing the contents of a PNG (Portable Network Graphics) in an editable, all-text form. The project supports the sng compiler, which can translate
between SNG and PNG.
This is an amazing idea. Yes, yes I heard about it in AOUP, I've started playing with it, and I am deeply interested. I can use the language of my choosing to reprocess a PNG file in ways that may not be catered for with GUI tools or Magick - ie tweak with the actual format representation, then output PNG again. Nice.