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>without the weirdness of PNG 'line based loading' which is obsolete nowdays

How? Line-based loading is a very simple way to exploit 2D spatial coherence. A 1D format like gzip loses this advantage for minimal gain in simplicity.

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You can’t just ignore signal compression algorithms unless you are fine allocating 4-5x more bandwidth to images.
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I believe 7zip outdoes bzip2 these days along every metric

And lossless jpeg-xl exceeds your idea

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7zip meaning what, LZMA (xz)?
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and zstandard outdoes 7zip (LZMA)
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These days I favour lossless WEBP instead of PNG. I often save around 30%~40% of file size compared to PNG, especially when the PNG is encoded with lots of bits per pixel (i.e 48 bits or 24 bits).
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I think that’s why they were advocating for gzip or bzip2 instead of just relying on PNG’s built-in compression.
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how about lossless JPEG XL
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