At first glance, I probably thought JXL was another attempt at JPEG2000 by a few bitter devs, so I had ignored it.

Yeah, my examples/description was more intended to be conceptual for folks that may not have dealt with the nitty gritty. Just mental exercises. I’ve only done a small bit of image analysis, so I have a general understanding of what’s possible, but I’m sure there are folks here (like you) that can waaay outclass me on details.

These intermediate-to-deep dives are very interesting. Not usually my cup of tea, but this does seem big. Thanks for the info.