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Webp
(lemmy.ml)
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this post was submitted on 20 Sep 2025
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JPEG XL has a mode for losslessly encoding any lossy JPEG into a smaller file size without any loss of quality. Wikipedia has some description of general approaches for losslessly encoding JPEG files further.
I don't know if webp uses any of these tricks, but I don't see why it would be hard to imagine that compression artifacts from a 30-year-old format can be encoded more efficiently today.