I'm trying to mechanically identify changes between two movie versions. I've layered one over the other using the 'Difference' blending mode. The areas which are similar or almost identical now show up as black, while areas which have a change between versions, show up some other color.

I'm wondering if there is a program or function which can create a graph of RGB on one axis and Time on the other. (maybe it would average each frame, maybe there is some higher level of interaction) Since most frames are almost all black, the graph would be primarily flatlined, but the areas where a change between movie versions occurs would spike the RGBs. I could then go to those frames and see what the change is about.

Does something like this exist?