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Beyond RGB: A new image file format efficiently stores invisible light data (arstechnica.com)

submitted 2 weeks ago by [email protected] to c/[email protected]

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[–] [email protected] 49 points 2 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?

[–] wischi 9 points 2 weeks ago* (last edited 2 weeks ago) (1 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

[–] [email protected] 1 points 2 weeks ago (2 children)

Both og JPEG and JXL support lossless compression.

[–] wischi 1 points 2 weeks ago

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

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