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0 pointsliuliu9mo ago0 comments

JPEG XL has the mode that in layman's word, allow bit-by-bit round-trip with JPEG.

Original JPEG -> JPEG XL -> Recreated JPEG.

Sha256(Original JPEG) == Sha256(Recreated JPEG).

That's what people meant by "backward compatible".

0 comments

That’s not “backwards compatible”, but “round tripable” or “lossless reencode”

exactly, it is absolutely not backward compatible. It is lossless-at-bit-level conversion of JPEG, but that doesn’t help older SW in any way.

j / k navigate · click thread line to collapse

0 pointsliuliu9mo ago0 comments

JPEG XL has the mode that in layman's word, allow bit-by-bit round-trip with JPEG.

Original JPEG -> JPEG XL -> Recreated JPEG.

Sha256(Original JPEG) == Sha256(Recreated JPEG).

That's what people meant by "backward compatible".

That’s not “backwards compatible”, but “round tripable” or “lossless reencode”

exactly, it is absolutely not backward compatible. It is lossless-at-bit-level conversion of JPEG, but that doesn’t help older SW in any way.

j / k navigate · click thread line to collapse