Some of you noted, that if you use color matching tool to match the bluray to the screener, the skin tones don’t match, and there are undesired artifacts in the resulting frame.
I decided to have a look myself. First of all, when using the color matching tool, make sure that both images are cropped in the same way. Secondly, if artifacts appear try increasing the stabilization parameter. This usually also requires an increase for the number of color spaces needed to get a good color match. I did some experiments, and found that I get the best results, if I use 100 color spaces, and set the stabilization to 10.
Bluray:
Screener:
Bluray matched to screener:
Note, that the black crush of the bluray, and the off-set in the black levels of the screener results in some undesired noise in the dark areas. The solution is, to simply correct the black levels:
This way the screener color grading is still fully intact, and no fringing.
Here’s a comparison between the bluray and the regrade: