JPEG XL

From Wikipedia:JPEG XL:

JPEG XL is a royalty-free raster-graphics file format that supports both lossy and lossless compression. It is designed to outperform existing raster formats and thus become their universal replacement.

Usage

libjxl comes with the official encoder/decoder programs: cjxl and djxl. JPEG XL is also supported by imagemagick and ffmpeg. To convert existing formats to jxl (JPEG files are compressed losslessly by default) use:

$ cjxl input.jpg lossless.jxl

To display image metadata:

$ jxlinfo input.jxl

Exiftool also supports jxl since 12.25, but might be limited by some metadata that needs to be decoded. --compress_boxes=0 flag can be passed to cjxl to keep metadata uncompressed, making it possible for Exiftool to parse it.

For file de-duplication purposes, it might be desirable to get the checksum of the actual encoded image:

$ exiftool -api ImageHashType=MD5 -ImageDataHash

Support

Browsers:

• Firefox (nightly): set image.jxl.enabled to true in about:config.
• Firefox: Install the JPEG XL viewer extension.
• Chromium support was added in version 91, removed in version 109. Was behind the flag chrome://flags/#enable-jxl.

Image viewers:

• Gwenview: install kimageformats
• nsxiv
• swayimg

Previewers:

• Dolphin: install kimageformats
• ueberzugpp

See also

• Information and support status of JPEG XL
• List of supported software
• Tracker for support status in software