JPEG XL next-generation image compression architecture and coding tools
Jyrki Alakuijala, Ruud van Asseldonk, Sami Boukortt, Zoltán Szabadka, Martin Bruse, Iulia M. Comșa, Moritz Firsching, Thomas Fischbacher, Evgenii Kliuchnikov, Sebastián Gómez, Robert Obryk, Krzysztof Potempa, Alexander Rhatushnyak, Jon Sneyers, Zoltán Szabadka, Lode Vandervenne, Luca Versari, Jan Wassenberg · 2019
An update on the JPEG XL standardization effort: JPEG XL is a practical approach focused on scalable web distribution and efficient compression of high-quality images. It will provide various benefits compared to existing image formats: significantly smaller size at equivalent subjective quality; fast, parallelizable decoding and encoding configurations; features such as progressive, lossless, animation, and reversible transcoding of existing JPEG; support for high-quality applications including wide gamut, higher resolution/bit depth/dynamic range, and visually lossless coding. Additionally, a royalty-free baseline is an important goal. The JPEG XL architecture is traditional block-transform coding with upgrades to each component. We describe these components and analyze decoded image quality.