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Just demosaiced JPEG XL? That's not raw. Lossless JPEG XL is in the DNG spec since three years (v1.7). So, you can convert your proprietary camera raw files to

• mrngld 19d ago
  PureRAW can now output linear DNG's compressed with JXL. It's amazing the first time you use it seeing 25mb RAW files go in, get made linear, and pop out 8mb or 9mb, then toss them in your RAW developer of choice and still find all the dynamic range and such you'd expect from the original RAW. I'd been doing that on my own with a script that called Adobe's DNG Converter, which has the same capability, to convert older versions of PureRAW's linear DNG to JXL-based DNG files, but that's no longer necessary. Unfortunately, at least as of perhaps a year ago, I couldn't find any other actively maintained software tooling that could reliably do what Adobe's DNG Converter was doing, and there's so much nuance to the world of RAW files that's not at all just a trivial one-shot prompt to Claude/Codex to roll your own.
• SideQuark 19d ago
  > not linearized Not linearized as in samples do not represent linear color space? I think that's untrue, as all sensor work I've done (a decent amount across many projects) are linear: double light = double photon count = 1 bit of sensor space. There are technically often some bends from physical and engineering effects (photon interaction with substrate has some variability, temperature affects things a bit). Or is there some other meaning of "not linear" you mean?