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Trig (lemmy.world)

submitted 10 months ago by [email protected] to c/[email protected]

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[–] [email protected] 4 points 10 months ago (1 children)

Sticking with image compression, see Quite Okay Images. It treats each pixel as three numbers and expects mostly small changes. Recent pixels get hashed and can be referenced in a few bits. This is enough to compete with PNG filesizes, an order of magnitude faster, while handling each pixel exactly once.

[–] [email protected] 2 points 10 months ago

though note than lossy formats , like JPEG which was used here , do use Fourier transforms , which are very intense trigonometry . IIRC PNG doesn't use trigonometry either , ~~though I'm not entirely sure~~ yup PNG uses DEFLATE after some filtering , so no sine there I believe