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JNG (jpeg network graphics) is essentially jpeg that support alpha channel.

Jpeg LS do support lossless images.

Jpeg2000 (and jpeg ls and jpeg xr) thankfully wasn’t implemented in any major way. Keep it simple, stupid.

Then chatgpt missed an obvious issue, nvidia definitely have had shortcomings in the hardware implementation of coder/decoders only supporting 420 in nvenc/nvdec. One obvious problem with that was that it affected premiere.