I'm pretty sure the 1993 THX was the first to do extensive color correction as the films must have been very faded at that time. It seemed like an attempt to bring the movies back to how they originally looked.

The special collection is probably the best transfer without any tweaking but without that, it is from a faded print without the full contrast.

I had never seen this promo about the widescreen video before. In this upload though, notice near the end that Obi Wan's light saber is green.

Just thought I'd mention another example of color inconsistency. It's really hard to find out what the true look of these movies is because the colors seem to have faded or changed so many times LFL just tried to do whatever quick fix was available at the time. Which might have changed other stuff.

Another upload on youtube of the same video is brighter and less saturated but the saber still has a green tint.