Hi,

darktable is setting a flag for images to be HDR and SDR. It doesn't really 
make use of it, but we probably have to change that in future.
Currently the decision if an image is a HDR or SDR is based on the image file 
type. I think this is wrong and we need to do it based on the color space of 
the image.

sRGB -> SDR
AdobeRGB -> SDR

PQ Rec2020 -> HDR
HLG Rec2020 -> HDR

Does that make sense? I could look into that next.

The next step would be to convert HDR nits to SDR nits, so that you can 
actually see the images. We also need a mode to edit in HDR in future which 
means that the histogram needs to scale differently.

See also:
https://github.com/darktable-org/darktable/pull/3752
and
https://github.com/darktable-org/darktable/pull/3749


Cheers!


        Andreas


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