A recent screening of a 1977 Technicolor print shows that the death star's interior is supposed to have a subtle blue hue, which was also present in the 1997 SE (which actually has very accurate colors, since it was timed to match Lucas' 1977 reference print).
The 2004 DVDs radically screwed up the colors, though, so they are not a good reference at all.
And the 2006 letterboxed DVDs of the theatrical versions are rather desaturated, so they're also not a great color reference.