Hello,
As I’m shooting mainly small club metal concerts lighting is often near to non-existant, so denoising is an almost mandatory step of my workflow.
Up until I discovered this script I just denoised all my pictures before importing the resulting DNG’s into darktable. Using this script is easier on resources, but there’s one thing that’s still quite time consuming: copying the history stack for each individual file from NEF to DNG.
Is there some kind of batch solution for this, or another script I haven’t discovered yet? I thought grouping would help with that, but it seems I’ve misunderstood it’s use 
Copy the xmp files based on file name, then import?
So from e.g. BK1_33835.NEF.xmp make a copy to BK1_33835.dng.xmp at the same location as the dng-files before importing them?
Sounds feasible 
Thanks 
Yes, that’s what I meant. If DxO spits out demosaiced data, I think darktable will ignore the demosaic module that was used in the original raw. I haven’t tried, but it would be logical.
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I don’t know why I hadn’t thought of this myself, but it works perfectly.
Thanks again!
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I’m glad it works. Have fun!
The only fly in the ointment is that drawn masks won’t line up precisely when you copy them over from your raw file to the DxO DNG.
For some reason, DxO slightly down scales the raw file during conversion. The change isn’t perceptible, but it will take drawn masks out of alignment. Parametric masks won’t be affected by this.
It’s not a show stopper, but it’s something to be mindful of.
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Thanks for the heads-up. Lucky for me that is an area of darktable I have not yet dabbled in a lot 
What I did notice is exposure seems to be over when I set it correctly in NEF and then apply the same XMP to the DxO-dng.
Yes, it seems that DxO makes some changes to exposure, and colors seem more saturated as well.