JPEG XL is based on ideas from Google's PIK format and Cloudinary's FUIF format (which was in turn based on FLIF).
Krita correction software#
Royalty-free format with an open-source reference implementation: The software is available on GitHub under a 3-clause BSD license.Efficient encoding and decoding without requiring specialized hardware: JPEG XL is about as fast to encode and decode as old JPEG using libjpeg-turbo and an order of magnitude faster to encode and decode compared to HEIC with x265.Support for animated content: For encoding realistic content regular video codecs are preferred.Support for wide color gamut and HDR: JPEG XL has built-in support for various color spaces, transfer curves, and high screen brightness.
Perceptually optimized reference encoder: It uses by default perceptual color space, adaptive quantization, and conservative default settings.Graceful quality degradation across a large range of bitrates: Quality loss isn't as abrupt as with older formats.Support for both photographic and synthetic imagery: The format features two complementary modes that can be used depending on the image contents.Lossless encoding: Includes lossless alpha encoding.
Reversible JPEG transcoding: ~20% size reduction can be achieved. Progressive decoding: Mode specifically designed for responsive loading of large images depending on the viewing device's resolution. Independent tiles: Decoding of sections of a large image by allowing images to be stored in tiles. Frames can be smaller (or larger) than the image canvas and can be blended in various ways. There can be multiple frames, with non-zero duration (for animation) or with zero duration (making them work more like layers in graphics software). Additionally the rest of the channels as optional "extra" channels like alpha, depth, or thermal data. Lots of channels available: Up to 4099 channels: main channels: either one channel for grayscale, three channels for RGB, or four channels for CMYK. Bigger dimensions allowed: Image dimensions of over a billion (2 30−1) pixels on each side. More functions: Improved functionality and efficiency compared to traditional image formats (e.g. 2100 with the PQ or HLG transfer function. It is specifically designed to seamlessly handle wide color gamut color spaces with high dynamic range such as Rec. It has features aimed at web delivery such as advanced progressive decoding and minimal header overhead, as well as features aimed at image editing and digital printing, such as support for multiple layers, CMYK, and spot colors. JPEG XL supports lossy compression and lossless compression of ultra-high-resolution images (up to 1 terapixel), up to 32 bits per component, up to 4099 components (including alpha transparency), animated images, and embedded previews. It also provides efficient lossless recompression options for images in the traditional/legacy JPEG format. The standard is expected to outperform the still image compression performance shown by HEIC, AVIF, WebP, and JPEG 2000. The JPEG XL call for proposals talks about the requirement of a next generation image compression standard with substantially better compression efficiency (60% improvement) comparing to JPEG. The file format and core coding system were formally standardized on 13 October 2021 and 30 March 2022 respectively. The bitstream was informally frozen on 24 December 2020 with the release of version 0.2 of the libjxl reference software. It was mainly based on a combination of a proposal called PIK, submitted by Google, and a proposal called FUIF - itself based on FLIF - submitted by Cloudinary. The proposals were submitted by September 2018, leading to a committee draft in July 2019. In August 2017, JTC1 / SC29 / WG1 (JPEG) published a call for proposals for JPEG XL, the next generation image encoding standard. Other collaborators are Sami Boukortt, Alex Deymo, Moritz Firsching, Thomas Fischbacher, Eugene Kliuchnikov, Robert Obryk, Alexander Rhatushnyak, Zoltan Szabadka, Lode Vandevenne, and Jan Wassenberg. The main authors of the specification are Jyrki Alakuijala, Jon Sneyers, and Luca Versari. The L was included because the authors' intention is for the format to replace the legacy JPEG and last just as long, too. The name consists of JPEG (for the Joint Photographic Experts Group, which is the committee which designed the format), X (part of the name of several JPEG standards since 2000: JPEG XT, JPEG XR, JPEG XS), and L (for long-term). It is designed to outperform existing raster formats and thus become their universal replacement. JPEG XL is a royalty-free raster-graphics file format that supports both lossy and lossless compression.
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