I believe that the blu-ray was color graded on a shot by shot basis and then a blanket yellow tint was added. I have just removed the blanket yellow tint and left the shot by shot colour grading underneath intact. You may think that methodology is flawed but to my eyes that is not the case and I see a lot of flaws in your own methodology which I’ve pointed out earlier, the unnatural looking fleshtones in particular which is a very big problem, the biggest a release can have as far as i’m concerned.
I very much doubt your first statement is true, because the magenta cast makes this highly unlikely. Finding the proper skin tones has proven to be highly subjective, in part because skin tones tend to vary substantially in reality from yellow to orange, to pink, to red even for caucasian skin types. Your preferences in terms of skin tones are well documented, and have been subject to many debates. A magenta cast is just what it is, and unlike skin tones it can be quantified. As such it’s presence should be classified as an artifact, unless it’s delibirate, in which case it’s an unusual choice.
Colour matches would perhaps only be worthwhile in my opinion if you had a 35mm frame of every single shot in the film to match to, and even then, trying to force the colours of the blu-ray to match the very different colours of the 35mm LPP gives very questionable results to my eyes, for it to work the colours and image dynamics have to be 100% identical. This shot below for example of the Bluray matched to the 35mm LPP, the fleshtones just look wrong to me, they don’t look right relative to the lighting of the scene and the overall colours. The 35mm LPP frame looks fine, but the Bluray matched to 35mm LPP does not IHMO, like you’re trying to force two completely different colour schemes and image dynamics together and ended up with a bit of a mishmash where the colours don’t interact correctly.
This seems rather odd to me, since the algorithm matches hue, contrast, and saturation. Differences can occur due to missing color gradients, making it such that one source is easier to match than another, but it’s certainly not related to the overall colour schemes and image dynamics. The color match was done very quickly, but done more accurrately (more color spaces, less smoothing), the colors become almost indistuinguishable, aside from the obvious heavily applied DNR to the bluray:
