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A comment on JPEG XL and the Pareto Front. Parent comment
The heuristics (here https://github.com/libjxl/libjxl/blob/main/lib/jxl/enc_ar_co...) for choosing that value are quite primitive and produces only two values: no smoothing and some smoothing (values 0 and 4).
If we replace those heuristics with a search that tries out which of the values is closest to the original, we should get better quality, especially at the lowest bitrates where smoothing is important.
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The heuristics (here https://github.com/libjxl/libjxl/blob/main/lib/jxl/enc_ar_co...) for choosing that value are quite primitive and produces only two values: no smoothing and some smoothing (values 0 and 4).
If we replace those heuristics with a search that tries out which of the values is closest to the original, we should get better quality, especially at the lowest bitrates where smoothing is important.