Hi Paul,
I think that the WB in camera is a kind of secret sauce. I would imagine that camera makers invest a lot of R&D in that area. At least for some time, Nikon has encrypted that information in their files.
My experience is just with the P45+, but I have found auto WB extremely unreliable. But, I happened to set daylight as default for my P45+ in Lightroom and suddenly started to get good results. I would think the problem is that colour temperature is often a part of the light. If you shoot a sunset the light may be 2300 K, but you would probably have a pretty high Kelvin setting so the magic colours are retained. A good WB algorithm must recognise sunset and adjust WB accordingly.
Here is an interesting case, it is a P45+ shot, balanced on a grey card not shown in the image. The inset colours are samples take from the subject and measured with a spectrometer. Capture One on to and LR CC 2015 at bottom.
Now, it has been suggested that I would use Capture One with the following settings:
- ICC Profile Phase One P45+ Flash - Easy Grey
- Film standard
- White balance Flash
Now, that gave nice purples on the flowers but yellowish blades. Also it is a bit counterintuitive that you wouldn't white balance on a grey card you have in your picture.
Lightroom reproduces those colours easily.
Best regards
Erik
Better said than by me but I agree 100% Phase One color out of the camera is most terrible unless I am shooting on bright day. Tons of time go into getting the image where I want it, and I often shoot a reference with my X-T2 as color out of that camera is much more accurate. Phase One WB is a mystery I have yet to figure out since 2008. I had hoped that with the CMOS tech P1 would make it easier, but IMO it's just as tough as CCD.
Paul Caldwell