I’m recently interested in ‘colorimetric’ color, that is, colors as rendered through a camera matrix or LUT that was created from either a target or SSFs, no ‘looks’ or other color processing. In that regard, here’s a rendition made with rawproc, camera blackpoint, camera whitebalance, ahd demosaic (amaze is doing something goofy of late, need to troubleshoot that…) and just a bit contrasty filmic curve, using the z6 LUT camera profile (all the recent Nikons are similar, and I can’t find the D750 profile I made a few weeks ago… ).
In the full-resolution image I don’t see noise worth addressing; indeed, even at ISO 1600 you’ve got a shutter speed and aperture such to give the sensor decent exposure, and it’s a D750 after all. With respect to the color, only the red shirt changed substantially when I changed from the matrix to the LUT profile, skin tones remained the same. Mine are middle-of-the-road compared to most others; your side-by-side comparison between your edit and OOC pretty well defines the range. Whitebalance probably has a lot to do with the cooler renditions, although I wonder how the OOC camera gave such a blue tint when the camera-supplied numbers didn’t reflect that.
Nice color exercise!