JPEG XL

JPEG XL is a 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 based in part on the FUIF and PIK formats. The standard also supports recompression of JPEG files with bit-exact reconstruction.

Identification
Based on the reference implementation, JPEG XL codestreams start with bytes. Codestreams may also be wrapped in an ISOBMFF-based file format (implementation). See format overview.

Specifications

 * Committee Draft of JPEG XL (2019-08)
 * ISO/IEC 18181

Software

 * Open-source reference software
 * Online converter to JXL
 * GIMP Support

Sample files

 * https://telparia.com/fileFormatSamples/image/jpegXL/

Links

 * Overview of JPEG XL
 * Next-Generation Image Compression (JPEG XL) Draft Call for Proposals (2017-11)
 * Revised Draft Call for Proposals (2018-02)
 * Final Call for Proposals (2018-04)
 * Gigazine article (2017-08-15)
 * Slides from Imagecon 2019 presentation
 * Introductory paper (open access)
 * Benchmarking JPEG XL image compression
 * How JPEG XL Compares to Other Image Codecs (2020-05-26)
 * Codestream vs Container discussion