There is one area that can be significantly improved upon, and that is color correction/restoration. The colors in the GOUT are much more washed out than the original colors in the films.

Fortunately, it seems much of this can be restored. But in order to get the colors close to their accurate levels, precise corrections would have to be made that boost and adjust various specific colors within specific color range values. So that only those things within a scene that need to be corrected by that amount are affected, while the other colors are adjusted separately. And this would require scene-by-scene color correction (because the degree of correction needed for various colors is different for different scenes).

So, if you want to make precise manual corrections to the GOUT DVD set, this is exactly where those efforts would be needed. In fact, there's no other way to do it. One correction applied to a whole movie will not deliver those properly saturated color levels without messing up the flesh tones in the movie. The goal being to restore the original strong lively colors that the Star Wars trilogy has, without altering the proper light and natural skin of the people in the movies. But only a precisely controlled scene-by-scene correction can do that.

Read this thread for lots of great pictures and discussion on how to get the original film colors back to their correct appearance. I hope it's of some help. :)

http://originaltrilogy.com/forum/topic.cfm/GOUT-Automated-Theatrical-Colouring-and-a-Reference-Guide/topic/12289/