Um.. well, that isn't quite accurate. There were many R2D2's for each movie and while many of them are virtually identical, there are differences. One reason R2 may have so many various appearances in ANH is that they may not have all be finished the same. Most appear to be blue anodized aluminum. However, for TPM, R2 is finished completely differently in the entire movie. Instead of the blue gleaming panels, they are dull and painted. Also, there is one publicity photo from Tunisia where R2's head is nearly black and his body is all white (no blue). Also, R5D4's legs are an even brighter blue than R2. Also, in all the original space shots R2 is black. Most, but not all, were fixed.

My goal is to get them as close as possible to matching overall. The blues in ANH are over blown, so are the reds. My goal is to mute all of them. Not every shot was done the same, either in the camera, post production, or restoration, so it is a challenge. I'm just after the best overall color correction for each movie. C3PO seems a bit more consistent, but sometimes seems more orange and sometimes more green. I'm erring on the more green (actually more brassy) since that is the general color in all the special features and the other 3 movies.

My starting point has been the magenta tones and I think I have found a way to correct for that that also addresses most other issues. It fixes the flesh tones, the blow out reds, and most of the other color issues. Just not sure I've landed on the right balance yet, but when I watched the first draft, it was a big improvement in just about every scene.