Samsung (S24 Ultra) phones don't do raw anymore, it's not Adobes fault..

[Wurstkrapfen]

Around the release of the S23U Samsung broke RAW support, probably with switching to JPG XL and doing it wrong.

https://r2.community.samsung.com/t5/CamCyclopedia/JPEG-XL-Image-Codec/ba-p/15356525

Current DNG files are absolutely useless and have no dynamic range advantage over the jpg (taken at the same time/settings) and they are incompatible with Adobes AI Denoise because they are pre-processed probably 8bit JPGs in a DNG container.

 

 

[Wurstkrapfen]

Back in 2022 it all worked with the S22U, but raw support was also removed with later firmware updates.

 

 

 

 

 

[Wurstkrapfen]

@Rikk Flohr: Photography 

Hi, could you maybe check something with Samsung again, I stumbled on this and them maybe not using JPG XL as it's meant too be used. This very much sounds like it would result in the insufficient DNG files we get from Samsung phones these days. This would need to be checked/fixed for ProMode in the stock camera app and I also think for ExpertRAW.

 

[Wurstkrapfen]

@Rikk Flohr: Photography 

[Jonnyawsom3]

A few things wrong with that response.

Colorspace is always preserved in lossless mode, only in lossy is it converted.
VarDCT is used for lossy, but due to similarities can also transcode original jpeg files. It can still be used for visually lossless as mentioned in the third point.
JXL supports lossy HDR, so even if it were incorrectly set, the results above should not happen.

As I've said in this Github issue, the file is not JXL compressed. The compression method is listed as JPEG, and the image data decodes as lossless jpeg (the old standard before recent JXL support).