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  • josefjk@mastodon.social
    Oct 14, 2026, 8:45 PM

    in my experience JPEG XL (and all of the other "more or less a still frame from a modern video codec" image formats) have this thing where they denoise the image like one of those "get rid of the pores on my face" selfie filters from the early 2010s. original actual JPEG ("JPEG Classic") instead just whacks some random DCT coefficients in there to make a nice fizzling surface texture which is mathematically erroneous but gels the whole image together in a way that's somehow true to the original

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  • josefjk@mastodon.social
    Oct 14, 2026, 8:50 PM

    in theory the new ones ought to have Grain Synthesis, but its either not very good, or is some kind of optional thing. some other nice things about Actual Original JPEG are that it's completely fine and completely adequate, and normal, and will exist forever, and also that you can decode it on a computer with about the same amount of processing power as a shoe

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  • josefjk@mastodon.social
    Oct 14, 2026, 9:13 PM

    @rich no it whacks in coefficients according to a fully deterministic process which isn't random at all and results, if the input looks random, in an output pattern that also looks random

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