Notices by Gianni Rosato (gianni@disobey.net)

Making Software: Image Compression
https://www.makingsoftware.com/chapters/image-compression

Cool to see WebP addressed here too!

@pirboazo oops, sorry! Let me contact the host

@tommi @yawnbox Hey Tommi, nice to meet you!

I think something like https://github.com/fabianwimberger/immich-convert-originals might be close to what you're looking for? I haven't vetted it (I don’t batch process images for my personal use case), but you can check whether everything is preserved with `exiftool`.

Broadly, there are 3 common image metadata formats you’ll run into: ICC (color information), EXIF (descriptive information about the photo, like your camera specs), and XMP (custom XML). If you procure a test file, run it through whatever tool/script/etc you’re thinking about using (libjxl, libavif, or something else), and check the before & after with `$ exiftool <image>` to ensure the metadata is the same, you should be good to go with any photos similar to the test case (e.g. you know they have the same metadata fields & file format).

Good luck, lmk how it goes!

fcvvdp 0.2.0! https://github.com/halidecx/fcvvdp/releases/tag/0.2.0

Highlights: ~9-12% speed boost for single-threaded, task threading (220% faster than the reference implementation with 8 threads on my 13700k), FFmpeg support via patch. Check it out and lmk what you think!

@barrbrain wow, definitely going to look into this, thanks! Very cool!!

New Halide blog post on post-processing for chroma as it is relevant to compression efficiency: https://halide.cx/blog/chroma-handling

Seems like you can get a roughly 2% efficiency improvement with 4:2:0 decoder output just with smarter post-processing for chroma. Pretty neat!

#avif #webp #jpeg #transcoding #compression

@rachelplusplus Best of luck, I’ve consistently been a big fan of all of your image compression blog posts!

SVT-AV1 4.0.0 is here!
Changelog: https://gitlab.com/AOMediaCodec/SVT-AV1/-/releases/v4.0.0
SVT-AV1-PSY's porting efforts are fully complete, and this release also features huge AVIF improvements. Maybe the most exciting release to date by my standards – SVT-AV1 is finally a real perceptual encoder!

#av1 #avif #compression

Happy Holidays! Introducing fcvvdp, a faster CVVDP implementation: https://github.com/halidecx/fcvvdp

Compared to the reference implementation running on the CPU, fcvvdp is faster (~15%) despite being single-threaded. It sees stronger wins with user time (up to ~15x) and memory usage (>90% less memory).

#compression #av1 #video

I spoke with Julio Barba at VideoLAN Dev Days in London!

Here are our slides, discussing SVT-AV1-PSY: https://giannirosato.com/files/svt-av1-psy_vdd_2025.pdf

I'll find access to the video & post it soon!

#av1 #avif #ffmpeg #vdd

@eeeps thanks for the shout out, glad ur liking my work!!

Introducing oavif: faster target quality image compression

https://giannirosato.com/blog/post/oavif/

oavif can be up to 63% faster than traditional target quality encoders. Learn how in the attached blog post!

#av1 #avif #compression

fssimu2 has its first release! https://github.com/gianni-rosato/fssimu2/releases/tag/0.1.0

fssimu2 is a fast SSIMULACRA2 implementation in Zig, with support for distortion map output. It is ~23% faster than the reference implementation at ~40% less memory usage, while being 99.97% accurate. Give it a look if you're interested!

New Halide blog post!

https://halide.cx/blog/consistency

Quality and speed define an image encoder's compression performance. Consistency is a close third, and easily overlooked in image encoder design. What value does it provide, and how can we measure it?

#avif #webp #jxl #jpegxl #compression

Anyone using rss/atom readers can now type `giannirosato.com` into their reader to get my website's atom feed

I got to interview Julio Barba from Google for the Halide blog: https://halide.cx/blog/julio-barba-interview/

Go check it out if you're interested in what the next decade of multimedia tech might look like!

Completely redesigned my website with Zola (https://www.getzola.org) – check it out at https://giannirosato.com

Let me know if any links are broken if you link to my site – it should be fully backwards compatible with my old link hierarchy

Tune 3: Still Picture is coming to SVT-AV1: https://gitlab.com/AOMediaCodec/SVT-AV1/-/merge_requests/2489

Formerly Tune 4 in SVT-AV1-PSY. Thank you Julio!

Exciting #avif news – libaom’s tune iq (derived from SVT-AV1-PSY’s Tune 4) is used across The Guardian’s website now. They say they serve mostly AVIF, with JPEG XL shipped when supported. Very exciting stuff!

Improving AVIF in Open Source via the Halide blog

hav1 #aviflide.cx/blog/improving-avif-in-open-source/index.html

I wanted to write this to explain some of what went into Tune 4/Tune IQ, & help outline some of my reasoning for starting Halide Compression in the first place. I hope you enjoy!

#av1 #avif #encoding