I think this still from what appears to be a Technicolor print probably captures what the Tarkin shots should look like imo (aside from too mucg green), and which ended up being the main reference source for my latest regrade:
That still is not from a Technicolor print, it is from a 70mm cell scan that was posted on this site: http://www.jedi1.net/.
Here’s the full image uncropped:
