jpeg-xl
libjxl
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jpeg-xl | libjxl | |
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2 | 84 | |
20 | 2,209 | |
- | 32.1% | |
7.0 | 9.8 | |
28 days ago | 4 days ago | |
C++ | C++ | |
BSD 3-clause "New" or "Revised" License | BSD 3-clause "New" or "Revised" License |
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jpeg-xl
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Heyo Everyone! - is there a win or mac software to batch convert imgs to avif?
shit i did not know that.. does it also work well with wordpress etc? because the only downfall of avif is bunch of extra steps on a nginx to get it to work right.. Also, u/LITUATUI 's comment, do i just change avif to jpeg-xl? i found something but didnt fully finish reading yet https://github.com/ImageMagick/jpeg-xl
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FSF Slams Google over Dropping JPEG-XL in Chrome
One of the most interesting things to me is that JPEG-XL is under an open Patent License, unlike the original JPEG.
https://en.wikipedia.org/wiki/JPEG_XL
Also, Google contributed quite a bit to it's development. As the patent grants show:
https://github.com/ImageMagick/jpeg-xl/blob/main/PATENTS
https://github.com/libjxl/libjxl/blob/main/PATENTS
Microsoft seemed to have gotten a patent on part of it's implementation (which Google also tried to get). Not sure if Google will pay to invalidate that patent, but I have a feeling they are more likely to defend AVIF.
https://www.theregister.com/2022/02/17/microsoft_ans_patent/
Google's control is a little concerning, but I do feel there are bigger fish to fry then choosing between two free formats. Like H.264 and H.265 patents.
libjxl
- JPEG XL Reference Implementation
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JPEG XL and the Pareto Front
https://github.com/libjxl/libjxl/blob/main/doc/format_overvi... is a pretty detailed but good overview. The highlights are variable size DCT (up to 128x128), ANS entropy prediction, and chroma from luminance prediction. https://github.com/libjxl/libjxl/blob/main/doc/encode_effort... also gives a good breakdown of features by effort level.
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Compressing Text into Images
For JPEG XL, refer to its format overview [1]. In short its lossless mode uses a combination of multiple techniques: the rANS coding with an alias table, LZ77, reversible color transforms, a general vector quantization that subsumes palettes, a modified Haar transform and a learnable meta-adaptive decision tree for context modelling.
One good thing about JPEG XL is that its lossy mode also largely uses the same tool, with a major addition of specialized quantization and context modelling for low- and high-frequenty components.
[1] https://github.com/libjxl/libjxl/blob/main/doc/format_overvi...
- JPEG XL v0.9.0 Released
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Stripping Metadata
The cjxl source is here. If you spot any reason why -x strip=exif may not work, tell me.
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Www Which WASM Works
The problem is that the instructions for actually running the WASM file are not that clear... the docs the author mentions shows how to compile to WASM, which is easy enough, but then here's the instructions to make that actually work in the browser:
https://github.com/libjxl/libjxl/blob/main/tools/wasm_demo/R...
Yeah, you need some mysterious Python script, a JS service worker at runtime, choose whether you want the WASM or WASM_SIMD target, use a browser that supports Threads and SIMD if you chose that, make sure to serve everything with the appropriate custom HTTP headers... just reading that, I can see that to get this stuff working on non-browser WASM targets would likely require expertise in WASM, which is the point of the OP. WASM's UX is just not there yet.
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First automatic JPEG-XL cloud service
https://github.com/libjxl/libjxl#usage
> Specifically for JPEG files, the default cjxl behavior is to apply lossless recompression and the default djxl behavior is to reconstruct the original JPEG file (when the extension of the output file is .jpg).
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Why "sudo make install"?
I mean compiling a bleeding edge kicad, inkscape or jpeg-xl is easy. But will probably trash your system if you already have an older version installed.
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XYB JPEG: Perceptual Color Encoding Tested
But you look at your image viewer that could have the lossless indicator? (and there is an issue open to add this indicator to the jxl files)
https://github.com/libjxl/libjxl/issues/432
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Heyo Everyone! - is there a win or mac software to batch convert imgs to avif?
You might want to use libjxl directly, e.g. for visually lossless images: cjxl --effort 9 --brotli_effort 11 --distance 1.0 --num_threads (nproc) --lossless_jpeg 0 input.png output.jxl on linux (if you're on windows/mac, just replace the (nproc) with the number of cpu threads you have, e.g. --num_threads 16).
What are some alternatives?
jxl-winthumb - A JPEG XL (*.jxl) thumbnail handler for Windows File Explorer.
qoi - The “Quite OK Image Format” for fast, lossless image compression
sharp - High performance Node.js image processing, the fastest module to resize JPEG, PNG, WebP, AVIF and TIFF images. Uses the libvips library.
Android-Image-Filter - some android image filters
highway - Performance-portable, length-agnostic SIMD with runtime dispatch
DirectXMath - DirectXMath is an all inline SIMD C++ linear algebra library for use in games and graphics apps
mv-extractor - Extract frames and motion vectors from H.264 and MPEG-4 encoded video.
libavif - libavif - Library for encoding and decoding .avif files
jxl.js - JPEG XL decoder in JavaScript using WebAssembly (WASM)
jxl-migrate - A simple Python script to migrate images to the JPEG XL (JXL) format
av1-avif - AV1 Image File Format Specification - ISO-BMFF/HEIF derivative
squoosh - Make images smaller using best-in-class codecs, right in the browser.