If you look at williarob’s “Restoring Color to Red Faded Film” video
…beginning at the 15:47 mark, he explains how you can build a model containing a wide variety of colors. You are grabbing sample frames of the shot that you are working on from both the reference video and the test video, and creating LUT’s of all the colors in that shot.
I noticed that the number of sample frames of the shot from both the reference video and the test video is 16. Why 16?