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Lossless JPEG would be amazing.
In my experience, as you increase the quality level of a jpeg, the compression level drops significantly, much more than with some other formats, notably PNG. I’d be curious to see comparisons with png and gif. I wouldn’t be surprised if the new jpeg compresses better at some resolutions, but not all, or with only some kind of images.
jpeg xl has been in development from FLIF for like 15 years there are tons of comparisons all over, even live ones on youtube
JPEG 2000 supports lossless mode.
There is Lossless JPEG since 1993.
