I would like to stress, that these photos are not a completely accurate representation of the frames themselves. The photos are more contrasty and saturated than the actual frames. However, I would also like to remark, that the frames themselves, next to a projected print, are the most direct and reliable color source available. The Mike Verta scans are uncorrected, and are therefore not a reliable color source. The only other reliable color source I’m aware of, are the photos Mike Verta shared of the technicolor print screening he attended, which confirm the yellow cast of the Tatooine sequences (the frames for these shots look more balanced than these photos):

I think the fact that we’re rapidly drawing conclusions based on a couple of quick photos of frames under varying lighting conditions using reflected day light and auto white balance, points to the danger of interpreting raw scans, and photos versus viewing a projected print or the frames themselves. There is very little that can be concluded from these photos, other than that the Tatooine sequences generally have warmer tones, than we see in most regrades. So, I would encourage everyone to reserve judgement until calibrated color sources are available, and not be led by preconceptions of what we believe the colors should be.