Weird, I always thought those pictures looked greenish too, but if you think they don't...
I know the Senator print had color differences from the IB print(s) the reference stills come from - the shots in the light saber duel of Ben and Vader in front of the big doorway looking out toward the Falcon had an overpowering blue tint, but there is a picture of the same scene from the Senator and the colors looked more "normal".