[lifthrasiir]

JPEG XL here is used in place of a traditional RAW format:

> Additionally, storage capacity has been reduced while maintaining image quality by providing JPEG XL format.

[Kye]

That's what DNG is for.

[lifthrasiir]

I mean, JPEG XL is designed as an all-encompassing file format that also subsumes RAW and DNG. On the other hand, DNG 1.7.0.0 added JPEG XL as one of compression options back in 2022 (!), which might be what Samsung is actually using.

[112233]

Where can I read more about JPEG XL subsumming of raw? As far as I understand, you cannot specify differen colorspace for different subsets of pixels?

[lifthrasiir]

That is done by a custom ICC profile. JPEG XL's own colorspace support is more like a shorthand for frequent presets.

[112233]

how can custom ICC profile encode information about bayer filter layout, dark frame or dead/phase photosites?

[lonjil]

The parent commenter is incorrect. Yes, the JXL authors do want to try to use JXL as a raw format, but they are focusing on other priorities right now, so the specification for how JXL could be used as a raw format doesn't exist yet. But the format is flexible enough to allow for it, without backwards-incompatible changes.