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About sixel encoding:

• https://en.wihttps://en.wikipedia.org/wiki/Sixelkipedia.org/wiki/Sixel

Technical documentation

• https://vt100.net/docs/vt3xx-gp/chapter14.html
• http://rullf2.xs4all.nl/sg/doc.html

Example images

• https://sourceforge.net/projects/sixelviewer/files/Sixel_Pics/

Existing tools:

• https://gist.github.com/hackerb9/a96cea91e6122d09a6c97f5eb797d5fa
• http://manpages.ubuntu.com/manpages/xenial/man1/img2sixel.1.html

Development:

• libsixel C library (along with bindings for other languages): https://saitoha.github.io/libsixel/
• header-only c++ library: https://github.com/ushitora-anqou/tinysixel
• python: https://github.com/saitoha/PySixel,
  • matplotlib plotting: https://github.com/kktk-KO/sixelplot https://github.com/fastai/fastai/blob/master/fastai/sixel.py https://twitter.com/jeremyphoward/status/1104248904000856064?lang=en

Open questions:

• RGB vs HLS Sixel format?
• Colour range?