JPEG XL

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File Format
Name JPEG XL
Ontology
Extension(s) .jxl
Released 2019 (draft)

JPEG XL is a work-in-progress compressed image format and/or file format that is yet another attempt to be the next JPEG. It was first announced around 2017-08. It is expected to be published as ISO/IEC 18181.

JPEG XL is expected to be based in part on FUIF and PIK formats.[1] The standard also incorporates Brunsli, and the original JPEG.

Contents

Identification

Based on draft information, JPEG XL is technically defined as a union of three different top-level formats:

  • Normal JPEG XL files, which start with bytes ff 0a.
  • Lossless JPEG1 recompressed files, which start with 0a 04 42 d2 d5 4e (see Brunsli).
  • Most standard JPEG files, which start with ff d8 ff e0.

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