Android-Image-Filter VS libjxl

Android-Image-Filter

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Tracking mentions began in Dec 2020.

libjxl

• JPEG XL Reference Implementation
  1 project | news.ycombinator.com | 4 Apr 2024
• JPEG XL and the Pareto Front
  9 projects | news.ycombinator.com | 1 Mar 2024

  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.

• Compressing Text into Images
  4 projects | news.ycombinator.com | 14 Jan 2024

  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
  1 project | news.ycombinator.com | 23 Dec 2023
• Stripping Metadata
  1 project | /r/jpegxl | 19 Oct 2023

  The cjxl source is here. If you spot any reason why -x strip=exif may not work, tell me.

• Www Which WASM Works
  2 projects | news.ycombinator.com | 24 Sep 2023

  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.

• First automatic JPEG-XL cloud service
  2 projects | news.ycombinator.com | 19 Sep 2023

  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).

• Why "sudo make install"?
  1 project | /r/linux | 16 Sep 2023

  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.

• XYB JPEG: Perceptual Color Encoding Tested
  2 projects | news.ycombinator.com | 20 Jul 2023

  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

• Heyo Everyone! - is there a win or mac software to batch convert imgs to avif?
  3 projects | /r/AV1 | 6 May 2023

  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).