Externsion .hdr darker than .exr
I created two HDR images via Luminance HDR using the same input files, one I saved in ".exr" format and the other in ".hdr". However, the ".hdr" image is much darker than the ".exr" on darktable.
When I open them in Luminance HDR, both look like the same. I only notice this difference on darktable.
Sorry if it's a know issue or if it is not an issue at all.
I attached two screenshots showing the problem
#2 Updated by Diego Cesar over 1 year ago
For the ".exr" the input color profile is "embedded matrix" while for the ".hdr" the output is "sRGB (e.g. JPG)". I've played around with the input color profiles on ".hdr" but there is no option to make it look better.
Here is the link containing the .exr and .hdr files if you want to have a better look. -> https://we.tl/y5nXAsOWTJ
#3 Updated by Tobias Ellinghaus over 1 year ago
I had a look at the .hdr file. It seems that PFStools omitted the Primaries header entry so darktable has no clue what the numbers mean. I am not sure if darktable would actually use the numbers if they were there, but like this there is nothing we can do.
Edit: Actually, the .hdr specs say that there are default primaries to use in that case. I will have a look.
#4 Updated by Tobias Ellinghaus over 1 year ago
- System changed from Ubuntu to all
- Status changed from New to Fixed
- % Done changed from 0 to 100
- Target version set to 2.4.0
I just added support for embedded primaries in .hdr files, and default values that follow the spec. Without that dt used sRGB for .hdr files which is a bad idea.
Even with that your sample file is still really dark. You will have to boost exposure and adjust black in the exposure module. That will bring you to the same state as the EXR.