Should the same color curve can be applied to all the films? I know that the Hoth scenes in ESB had a blue cast even in the original version, but it was subtle, not overpowering like the '04.
From zombie's article on the GOUT color from his website, here's the first image from the GOUT with his custom color settings:
And the theatrical-print bootleg (which, as he points out, does have a pink shift):
