this post was submitted on 29 Mar 2025
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[–] AbouBenAdhem@lemmy.world 7 points 3 months ago (9 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 10 points 3 months ago (3 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 4 points 3 months ago (2 children)

Lossless JPEG would be amazing.

[–] uis@lemm.ee 0 points 3 months ago
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