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JXL offers re-encoding of existing jpeg at smaller size with no quality loss, and has an efficient progressive mode. As the head of tech for a site with a few

JXL offers re-encoding of existing jpeg at smaller size with no quality loss, and has an efficient progressive mode. As the head of tech for a site with a few tb of user-supplied jpeg files (which are thumbnailed), I can see the appeal…

jbverschoor 4y ago
Not just no quality loss. Byte-for-byte identical
- Eisenstein 4y ago
  If something is 'byte-for-byte identical' wouldn't it be the same size?
  - adgjlsfhk1 4y ago
    It's byte for byte identical once you expand to an array of pixels. The storage format uses more advanced (lossless) compression, but the pixels that come out are identical.
    - edflsafoiewq 4y ago
      When you transcode back to JPEG, the JPEG is byte-for-byte identical to the original JPEG. But if you decode to pixels you do not always get identical results as the JPEG because the JPEG standard does not specify bit-exact decoding and different decoders may differ slightly.