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I find it curious how the AVIF deterioration resembles an old physical photograph. I wonder why that is. Do you know of more comparisons like this? I’d like to observe the effect further but don’t have the availability right now to pursue it.

It looks like a straight-up bug in chroma quantization. libaom has never had good chroma RDO tuning.

JPEG-XL works in even fewer programs than WebP does, though, which is almost impressive given WebP's reputation.

Yeah but Google goes out of their way to kill jpeg-xl, they really deserve to lose chrome