Apple's ProRAW format is Linear DNG, that is to say, already debayered, not what most people would call "raw". Previously they've used Lossless JPEG for compres

Apple's ProRAW format is Linear DNG, that is to say, already debayered, not what most people would call "raw". Previously they've used Lossless JPEG for compression inside these DNG files, but now they use JXL. The DNG spec also allows for using JXL to compress proper raws, but I don't know if anyone is doing this yet. I know Samsung uses JXL compression in DNGs produced by their phones, but I haven't checked if those are proper raws or debayered.