libjxl
pik
libjxl | pik | |
---|---|---|
85 | 9 | |
2,236 | 829 | |
28.2% | 0.0% | |
9.8 | 0.0 | |
about 14 hours ago | about 1 year ago | |
C++ | C++ | |
BSD 3-clause "New" or "Revised" License | MIT License |
Stars - the number of stars that a project has on GitHub. Growth - month over month growth in stars.
Activity is a relative number indicating how actively a project is being developed. Recent commits have higher weight than older ones.
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 Google's War Against It
> Regarding JPEG XL's mobile support, it makes sense it would see limited development if the company that manages one of the biggest mobile players has been the greatest restriction on their success. The lack of support also disincentivises manufacturers to prioritise support.
There was literally no involvement from any hardware vendor in the standardization of JPEG XL. It went from a Call for Proposals in Sept 2018 to Committee Draft in Aug 2019 with very little time for industry feedback. Contrast this with AV1 which had involvement from hardware vendors Intel, NVIDIA, Arm, AMD, Broadcom, Amlogic from the beginning as well as companies who ship media on hardware at scale such as Cisco, Netflix, Samsung and yes Google. These companies reviewed and provided significant feedback on the format that made it suitable for hardware implementation.
https://news.ycombinator.com/threads?id=JyrkiAlakuijala is a lead on the project and a Google employee, and active in JPEG XL development https://github.com/libjxl/libjxl/commits?author=jyrkialakuij...
- 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
pik
- JPEG XL: How It Started, How It’s Going
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Google set to deprecate JPEG XL support in Chrome 110
You do know that Google was one of the main contributors to JPEG XL (see https://github.com/google/pik )
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Google Chrome Is Already Preparing To Deprecate JPEG-XL
Google was a big part of JPEG XL and is actively working on libjxl as well... and JPEG XL is also based on FLIF and google's pik: https://github.com/google/pik so pretty weird.
- Andre gode eksempler på navne der simpelthen bare ikke fungerer på dansk?
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Pain in the ass
legally they had no choice because jpeg xl is based on flif.info and https://github.com/google/pik but the flif has LGPL license which should open source the rest.. however regardless the media group didn't really do much other than write some standard and slap their name on it. Wasn't their work.
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My early adopter experiences and thoughts on JXL so far
https://github.com/google/pik went into jxl, webp is based on their video codecs
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Alarm raised after Microsoft wins data-encoding patent - rANS variant of ANS, used e.g. by JPEG XL
The specific variant of ANS coding that is used in JPEG XL is basically the same as what was used in pik: https://github.com/google/pik/blob/2fb44c4834348392d0401ad9bab7cd314d85241e/ans_encode.h
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Didn't see that coming
Image compression researchers at Google designed the image format PIK
What are some alternatives?
qoi - The “Quite OK Image Format” for fast, lossless image compression
dont-accept-webp - Don't "Accept" image/webP - extension for Firefox
Android-Image-Filter - some android image filters
WebPShop - Photoshop plug-in for opening and saving WebP images
DirectXMath - DirectXMath is an all inline SIMD C++ linear algebra library for use in games and graphics apps
QuickLook - Bring macOS “Quick Look” feature to Windows
libavif - libavif - Library for encoding and decoding .avif files
Save-webP-as-extension - Firefox extension to overlay format and JPEG quality buttons on inline or stand-alone images for quickly saving a converted version of the image.
jxl-migrate - A simple Python script to migrate images to the JPEG XL (JXL) format
webp - webp for the Windows build of ImageMagick
squoosh - Make images smaller using best-in-class codecs, right in the browser.
sydent - Sydent: Reference Matrix Identity Server