this post was submitted on 29 Mar 2025
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[–] AbouBenAdhem@lemmy.world 49 points 4 weeks ago (13 children)

Spectral JPEG XL utilizes a technique used with human-visible images, a math trick called a discrete cosine transform (DCT), to make these massive files smaller [...] it then applies a weighting step, dividing higher-frequency spectral coefficients by the overall brightness (the DC component), allowing less important data to be compressed more aggressively.

This all sounds like standard jpeg compression. Is it just jpeg with extra channels?

[–] Prok@lemmy.world 42 points 4 weeks ago (5 children)

Yeah, it compresses better too though, and jpeg XL can be configured to compress lossless, which I imagine would also work here

[–] dohpaz42@lemmy.world 8 points 4 weeks ago (4 children)

Lossless JPEG would be amazing.

[–] zerofk@lemm.ee 8 points 4 weeks ago

JPEG 2000 supports lossless mode.

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