libjxl
qoi
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libjxl | qoi | |
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84 | 25 | |
2,178 | 6,720 | |
29.1% | - | |
9.8 | 6.4 | |
about 10 hours ago | 24 days ago | |
C++ | C | |
BSD 3-clause "New" or "Revised" License | MIT License |
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For example, an activity of 9.0 indicates that a project is amongst the top 10% of the most actively developed projects that we are tracking.
libjxl
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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.
They're available at https://github.com/libjxl/libjxl/releases/ for linux and windows.
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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...
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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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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)
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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).
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Why browsers will probably skip JPEG-XL (IMO).
One thing that doesn't really get mentioned is that libjxl has official .deb packages for Debian and Ubuntu users. You can just download the appropriate archive from the libjxl releases section (packages are available for Ubuntu 18.04, 20.04, and 22.04), do a sudo dpkg -i *.deb, and now your file manager has support for .jxl thumbnailing. And at least my distro's default image viewer (xviewer) gained viewing support just from installing the debs.
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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.
qoi
- CPNG, a backwards compatible fork of PNG
- PSA: Use ZopfliPNG to compress your PNG assets
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The most famous picture used as a standard in computer science is nudes from Playboy!
And people are really nice about asking for ceasing its use too..
How do you know it's not a problem for the people who work with computer vision? Let's take this for example - sure, the request itself was presented very unprofessionally, but this is still an example of someone in a computer vision-adjacent field stating in no uncertain terms that they have a problem with the image.
- What’s the best lossless image format?
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QOI – The Quite OK Image Format
I don't know about CUDA, however I've made an AVX2 based encoder a few months ago : https://github.com/phoboslab/qoi/pull/143
I intend to create an AVX2 based decoder but I had absolutely no time to work on side projects in the past three months.
You might also want to take a look at this streaming encoder if you want to encode large files with a tiny memory footprint : https://github.com/MKCG/php-qoi/blob/main/src/FFI/lib/qoi.c
- QOI – The “Quite OK Image Format” for fast, lossless image compression
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Losslessly compresses RGB and RGBA images to a similar size of PNG, while offering a 20x-50x speedup in compression and 3x-4x speedup in decompression
The spec finalization was extended to Dec 20.
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The Quite OK Image File Format Specification: A Single Page PDF
What exactly do you mean with "edge cases"? For what it's worth, the decoder has been fuzzed[1] and the benchmark suite[2] with 2800 images en-/ and decodes without losing any pixels, as checked by qoibench[3].
[1] https://github.com/phoboslab/qoi/blob/master/qoifuzz.c
[2] https://qoiformat.org/benchmark/
[3] https://github.com/phoboslab/qoi/blob/master/qoibench.c#L440...
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December 2021 What Are You Working On?
Here is link number 1 - Previous text "QOI"
What are some alternatives?
PNG-spec - Maintenance of the PNG specification
Zpng - Better lossless compression than PNG with a simpler algorithm
fpng - Super fast C++ .PNG writer/reader
Android-Image-Filter - some android image filters
DirectXMath - DirectXMath is an all inline SIMD C++ linear algebra library for use in games and graphics apps
qoi2-bikeshed - "Quite OK Image" version 2 discussions
libavif - libavif - Library for encoding and decoding .avif files
qoi - A rust implementation of the “Quite OK Image” format for fast, lossless image compression
jxl-migrate - A simple Python script to migrate images to the JPEG XL (JXL) format
squoosh - Make images smaller using best-in-class codecs, right in the browser.
ASFML - Ada binding to the SFML library
Halide - a language for fast, portable data-parallel computation