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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?
by 112233 3y ago
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 3y agoThat is done by a custom ICC profile. JPEG XL's own colorspace support is more like a shorthand for frequent presets.
- 112233 3y agohow can custom ICC profile encode information about bayer filter layout, dark frame or dead/phase photosites?
- lonjil 3y agoThe 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.
- lifthrasiir 3y agoAh, yeah, the current JPEG XL is not enough for the full RAW coverage. (I was talking more about per-channel color spaces.) There is indeed a reserved extra channel type for specific filter layouts among others, but its specification doesn't exist yet.
- JyrkiAlakuijala 3y agoFor some, possibly most, needs of using raw having yuv444, 14+ (or 16+) bits of precision and lossless or near-lossless (with strong guarantees of maximum error on individual pixels) compression is supposedly acceptable. I base this interpretation mostly on digital photography discussions I have seen on the internet. I am not a photographer myself. (12 bits of component already requires adapting to the current lighting and can supposedly slow down professional photography.)