Just got my brand new d610, wanted to play around in harsh conditions last night.
Little did I know that this blue LED lighting from underneath would completely confuse Darktable 3.0.2 and burn the blues out of the picture.
20200515_0052.NEF (29.5 MB)
I’m told it’s a gammut mapping problem actually being worked on here: Reboot channelmixer by aurelienpierre · Pull Request #4940 · darktable-org/darktable · GitHub
Here is basically what I get by default on Darktable 3.0.2:
For some reason, switching the input color profile to adobe RGB hacked around the problem and “sort of” got me my colors back, but I had to tweak exposure and the shadows as I definitely lost some hue (is that the right word?)
The picture is not that interesting, but it might be useful to validate future fixes to this situation and see if they maintain color sanity even with this corner case picture 
Interestingly, the effects are less severe on darktable 2.6!
I’m actually curious of what the easiest process to “repair” the colors might looks like, until the gamut mapping is “fixed” or improved.
A friend of mine “opened the picture on his mac and saved it” (that’s all I know about the process), and this is what he got:
As far as I know this is exactly how it should look like initially, so if you take the challenge, you can consider this the goal post
PS: On a last note, I actually do like the second one best, as it has darker blacks and accidentally cleaned some parts of the background to emphacize the leaves, although the last one is the most faithful one, at least as a starting point.
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Well, almost… should be posted soon.
