Either you have PNG data, or you have to support the various RGB encodings
> I can output images with the kitty protocol using pure BASH + base64, available everywhere.
This is disingenuous: so can I if instead of .PNG files, I have .SIX files.
I won't even need base64 - which you'll need to write in shell script if you write a portable bash script. And if want you want to show isn't .png or .jpg, you'll need more...
> Trying to claim the kitty protocol is harder to use than sixel is beyond disingenuous.
Funny, because I think the same about you.
Given the tone of your previous post, and the tone of this post, I'm out.