Well, in my experience, everything changes color depending on the lighting. On this case, it is sunlight, the identical light source found in a lot of on set photos. It also depends on camera filters and processing. But in the above frame I have barely touched the colors, mainly concentrating on the brightness, contrast, and saturation. It is pushed slightly to the yellow to reduce the reds, prevalent even in the GOUT.
Well yes, but my point was that while lighting does change everything, under no lighting (especially not direct sunlight) should there be a, say, green tint to artoo’s dome (unless lit by a green light, which is incredibly unlikely in this particular film).