libjxl
qoi
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libjxl | qoi | |
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84 | 25 | |
2,178 | 6,725 | |
31.1% | - | |
9.8 | 6.4 | |
6 days ago | 30 days ago | |
C++ | C | |
BSD 3-clause "New" or "Revised" License | MIT License |
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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).
qoi
- CPNG, a backwards compatible fork of PNG
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Ethically Sourced Lena Picture
Her request is politely-phrased and reasonable. I don't think there's a legal or ethical issue, but respecting the wishes of others when it costs nothing is just kindness.
However, the way that some have seized on it, and then interacted with others in their communities is ... neither polite nor reasonable.
e.g. https://github.com/phoboslab/qoi/issues/35
- 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!
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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At one company I worked at only one thing mattered: the yearly bonus
Yes. Without a supporting statement, it's ad hominem. But I provided a supporting statement.
This is the issue I'm taking about: https://mobile.twitter.com/richgel999/status/146443578680850...
Which links to here: https://github.com/phoboslab/qoi/issues/35
Where everyone agrees, yes, the image should be removed. They didn't know about its history. Would he please stop being a gigantic asshole about it.
So if that's not blowing things out of proportion, I don't know what is.
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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
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This is huge: GameMaker Studio 2 now uses QOI image format for textures!
Not only does compression improve this situation today, but using QOI means improvements may continue to come over time. QOI is a very new, open source image format, and that's already proving to be an advantage. By itself, QOI compression is pretty weak, but YoYoGames have forked it and worked in BZ2 compression to surpass the old PNG format. As QOI itself improves and as YoYoGames continues to work on it, it's almost guaranteed that we'll see the compression ratio in GameMaker get better over time.
- QOI – The “Quite OK Image Format” for fast, lossless image compression
What are some alternatives?
Android-Image-Filter - some android image filters
PNG-spec - Maintenance of the PNG specification
DirectXMath - DirectXMath is an all inline SIMD C++ linear algebra library for use in games and graphics apps
Zpng - Better lossless compression than PNG with a simpler algorithm
libavif - libavif - Library for encoding and decoding .avif files
fpng - Super fast C++ .PNG writer/reader
jxl-migrate - A simple Python script to migrate images to the JPEG XL (JXL) format
qoi2-bikeshed - "Quite OK Image" version 2 discussions
squoosh - Make images smaller using best-in-class codecs, right in the browser.
qoi - A rust implementation of the “Quite OK Image” format for fast, lossless image compression
fastapprox - Approximate and vectorized versions of common mathematical functions
ASFML - Ada binding to the SFML library