Here is a good example of how some of the colour only becomes apparent when you saturate it:

From the ESB trailer:

Raw GOUT:

They look pretty close together. But the saturation-corrected GOUT looks much different.

But before someone speculates that maybe such saturation isn't accurate, here is what the 1980 bootleg of a theatrical print looks like. Pink-shift, of course, but its obviously closer to the oversaturated GOUT, both in terms of saturation and also in terms of the blue cast.

Another good example:

Raw, uncorrected GOUT:

Here is the corrected GOUT, with the saturation pumped up.

And here is that shot in the theatrical bootleg:

Obviously, the bootleg does not have pefectly correct colouring, but the one thing we can learn here is that this scene has a blue cast to it. But you can only get that when the colours are deep and rich. That's why I love that outtake shot of Obi Wan on the Falcon, you finally see that rich, saturated look, and then you look at the GOUT and its just this dull blob.