There were still some things that bugged me about the regrade, among them the fact that I did not use an actual 35 mm reference. So, I decided to go back to the 35 mm references, more specifically this reference, which has a good white balance, and consequently does not seem to suffer from color shift:
However, it is too saturated, so I came up with a solution. By matching the gray scale image of the 35 mm frame to the gray scale image of the bluray, I can adjust the saturation and contrast of the 35 mm frame to match the saturation and contrast of the bluray, without affecting the colors. After this process it looks like this:
I then matched the bluray to this reference, and got the following result.
Bluray:
WOWOW:
Bluray matched to reference:
