Good news YUVfags, the experimental IQ tune is now available on AOM 3.12 and the latest GYAN FFmpeg binaries now contain the latter. It wasn't easy finding the right parameters since avifenc made things so simple.
ffmpeg -i in.png -color_range 2 -color_primaries 1 -color_trc 1 -colorspace 1 ^
-c:v libaom-av1 -usage 2 -still-picture 1 ^
-cpu-used 4 -crf 20 -qmin 20 -qmax 20 ^
-pix_fmt yuv444p10le ^
-aom-params tune=iq -y out.avif
https://github.com/GyanD/codexffmpeg/releases/tag/2025-02-17-git-b92577405b
The tl;dr about JXL/AVIF
>AVIF used to suck ass for high quality photographic images
>JXL used to outperform it by ~20%
>IQ tune addresses this problem but only AOM nerds could play with it
>GYAN is based
picrel is 25% crop of the high-res test image here:
https://files.catbox.moe/ur7bus.png