Zip Doodah said:

Here are some still comparisons from a 35mm IB Technicolor HD transfer of the film.

Nice captures! Those do give superior color targeting to fix up (as far as can be expected) other faded film. BTW, are some caps not coming through? It looks like there are spaces in your post where something more should be.

ww12345 said:

edit: Also, it could just be my eyes, but it looks a little hot, like somebody boosted the saturation. What does everybody else think?

Yes, they are over-saturated. A test reduction in the saturation (-25 in the paint program) brought things down enough to look gloriously more natural:

Back to the cap's original state, closer inspection reveals color fringing characteristic of lens chromatic aberration. (The same thing showed up in the THX 1138 restoration thread capture but was fairly easy to fix.) Also, the R-G-B spectrums show slightly crushed blacks:

Anyway, I was enthused to see if I could quickly match those colors into this project. The first approach, using histogram, wasn't going too quick. Then I tried the second approach, using curves, to map RGB low/middle/high neutral points from the new still to the original capture. That went quick and looked good -- it could use tweaking (or perhaps additional specific-color points), but it's almost there and an improvement over the previous unguided corrections: