struggling with "modern" white balance in darktable

[MarcoNex]

@priort

Basically if you set legacy WB to as shot check your result. Now add filmic. By default it will pull in the highlights without the massive artifacts.

Do the same and set WB module at D65 and CC set to as shot. This is not a perfect match for legacy but close. Now add filmic and you get strong blue artifacts. You can mitigate it by changing the norm but still it doesn’t happen with that norm using legacy WB.

Sorry for resurrecting an old thread…
I was curious about this issue and I did some tests.
To me, the difference between CC and legacy WB when coming to magenta highlights is entirely due to the highlight reconstruction module being activated or not.
If I disable HLR, I get magenta highlights with both methods.
Which makes sense, HLR is meant to fix exactly that problem, but it can only do it if WB is used in legacy mode. If you choose the modern workflow, then WB is set to camera reference, HLR cannot fix the magenta artifacts and you have to deal with those in filmic reconstruction instead.