this post was submitted on 29 Mar 2025
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Beyond RGB: A new image file format efficiently stores invisible light data (arstechnica.com)
submitted 1 month ago by cm0002@lemmy.world to c/technology@lemmy.world
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[–] AbouBenAdhem@lemmy.world 49 points 1 month 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?

[–] wischi@programming.dev 10 points 1 month ago* (last edited 1 month ago) (4 children)

It's not just like jpeg with extra channels. It's technically far superior, supports loss less compression, and the way the decompression works would make thumbnails obsolete. It can even recompress already existing JPEGs even smaller without additional generation loss. It's hard to describe what a major step this format would be without getting very technical. A lot of operating systems and software already support it, but the Google chrome team is practically preventing widespread adoption because of company politics.

https://issues.chromium.org/issues/40168998

[–] uis@lemm.ee 1 points 1 month ago (3 children)

Both og JPEG and JXL support lossless compression.

[–] wischi@programming.dev 5 points 1 month ago* (last edited 1 month ago) (1 children)

JPEG does not support lossless compression. There was an extension to the standard in 1993 but most de/encoders don't implement that and it never took off. With JPEG XL you get more bang for your buck and the same visual quality will get you a smaller file. There would be no more need for thumbnails because of improved progressive decoding.

https://youtu.be/UphN1_7nP8U

[–] uis@lemm.ee 0 points 1 month ago

Then same can be said about JPEG LS and JPEG XL. Most browsers don't implement that.

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