av1-avif
image_compression_comparison
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av1-avif | image_compression_comparison | |
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25 | 1 | |
437 | 257 | |
0.7% | 0.0% | |
0.0 | 0.0 | |
over 1 year ago | over 2 years ago | |
HTML | Python | |
BSD 2-clause "Simplified" License | GNU General Public License v3.0 or later |
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av1-avif
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FSF Slams Google over Dropping JPEG-XL in Chrome
The article is about avif not webp. Note the editors for the AOM avif specification don't even include Google https://aomediacodec.github.io/av1-avif/
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Whistleblowers Take Note: Don’t Trust Cropping Tools
This reminds me of something similar from the guy who implemented AVIF in Firefox. He gives a talk about the implementation [1] where he talks about the CLAP privacy problem. Basically the spec adds a field that allows for cropping of the image, but the binary file would still contain the original. This would lead users to believe some image data was deleted when it really wasn't. I always thought he spent a lot of time and effort on this for little gain, but now I'm starting to think it was worth his effort.
[1]: https://youtu.be/BUkRlfkv2D8?t=2199
And the related GitHub issue: https://github.com/AOMediaCodec/av1-avif/issues/188
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AVIF images encoded with yuv422 appear black on iOS 16 / MacOS Ventura
So actually the same images I linked above are in the AOMediaCodec repo as well, under Link-U: https://github.com/AOMediaCodec/av1-avif/tree/master/testFiles/Link-U And I see the same issue with the yuv422 images there as well. I'm guessing Apple's AVIF implementation must be incomplete?
- JPEG-XL Sample HDR Photos
- Questions about AVIF metadata for PQ HDR mastering & tonemapping
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What is AVIF?
Created by Alliance for Open Media and worked on by Netflix, Microsoft, and Google developers, AVIF is open source - you can even weigh in on image processing and spec issues.
- We need to rethink AVIF lossless mode.
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How can HDR AVIF stills be created?
I've been trying to find a way edit 14bit RAW files (.ARW) to an HDR capable format (HEIF/AVIF). In the process I found out there's an official AVIF encoder (1) by AOM that seems like it should be capable of creating HDR PQ stills.
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HDR AVIF samples (HDR10 for still images)
Others samples are available here : https://github.com/AOMediaCodec/av1-avif/tree/master/testFiles/Netflix/avif
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Question: Multiscale AVIF performance?
AVIF can do something that resembles hierarchical JPEG and that could be useful for progressive decoding: you can have multiple layers/scales, where e.g. first a 1:4 image is encoded, then residuals to get to 1:2, then residuals to get to 1:1. Examples of this were recently added to the AVIF spec: https://github.com/AOMediaCodec/av1-avif/pull/134
image_compression_comparison
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What is AVIF?
Netflix wanted to use HDR images. HDR uses software to increase the light and color in a photograph, producing larger images with large ranges of color. This meant they also needed to improve their image hosting. AVIF is a tool they're favoring. They have even documented their reasoning and testing, and you can clone their repo comparing different types of image compression.
What are some alternatives?
ImageMagick - 🧙♂️ ImageMagick 7
squoosh - Make images smaller using best-in-class codecs, right in the browser.
libavif - libavif - Library for encoding and decoding .avif files
chromium - The official GitHub mirror of the Chromium source
sharp - High performance Node.js image processing, the fastest module to resize JPEG, PNG, WebP, AVIF and TIFF images. Uses the libvips library.
brunsli - Practical JPEG Repacker
webp - webp for the Windows build of ImageMagick
lepton - Lepton is a tool and file format for losslessly compressing JPEGs by an average of 22%.
jekyll_picture_tag - Easy responsive images for Jekyll.
jpeg-xl - jpeg-xl for the Windows build of ImageMagick