I’ve read a short article that investigates, and provides examples for, using D65 for light sources (self-luminous highlights) in the image, while balancing the rest of the image according to the camera (as usual). I think this is something that can be done in darktable easily, using a parametric mask on color calibration, targeting the highlights, and the inverse of that for the rest of the image. The one image I tried it on did not give very different results, but that is to be expected, as the white balance was already relatively close to daylight.
Maybe this will be of interest to others:
https://onlinelibrary.wiley.com/doi/10.1002/col.22957
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Looks also like some interesting references in the article…
