There are varying levels/versions of restoration which are performed. Certainly there is a "warts and all" version with very little touched. But in general, the grading of Legacy is determined, essentially, by balancing two factors: 1) the original color timing of Technicolor prints and 2) knowing the absolute color values of props, costumes, and set pieces.

If, for example, Darth Vader's helmet appears alternately green-ish, blue-ish, and red-ish during a scene, only one of them is correct (not really, but you get the idea). Legacy matches them all to each other, and then matches that group to the original Technicolor timing which most closely matches the actual prop, and other items in the scene. Usually, you'll find that is 90% of such shots in the film, which indicates that with some exceptions, no particularly stylized grading was done to Star Wars. Most things were shot and timed fairly neutrally, plus whatever bias the stock naturally has.

The Death Star coloring is due partly to some of the set pieces actually being different colors, and lots just appearing that way because of inconsistencies in timing, and transfer anomalies over the years. Fortunately, I know which is which :) So I'm not making the slightly blue ones and green ones match, but all the blue ones match each other, and all the green ones match each other.

As for your absolute sense of color: don't trust it. Humans have an absolutely terrible memory for absolute color, and our perception system auto white-balances. This is why it's so dangerous to go "by eye" though we often have little choice.

_Mike