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A comment on Ask HN: What do you love/hate about terminals? Would you change them?. Parent comment

Re:Ask HN: What do you love/hate about terminals? Would you ... by jitl on Wednesday December 27, 2017 @08:55AM (#16014737)
There are already terminals and cat implementations that can display 24-bit images just fine in the terminal, by using special escape codes that each encode a pixel. No changes to the IO model needed.

https://github.com/saitoha/PySixel/blob/master/README.rst

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Re:Ask HN: What do you love/hate about terminals? Would you ... by jstimpfle on Wednesday December 27, 2017 @09:17AM (#16014838)
Sure - this is what I mean by "protocol". In the case of the image format you linked even cat does work, because the image format contains pre-rendered escape sequences. This does not work in general (e.g. for JPEG or other formats) - where you need a program that does the transformation into escape sequences.
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