Adywan has always graded the Star Wars Revisited movies to be neutral gray in areas where it makes sense for them to be neutral, such as the Death Star walls. However, what makes sense and what the film really looks like are sometimes two different things. In the original film, the Death Star walls were all over the place, green, blue, and even gray occasionally. So his versions are idealized and standardized versions of the movies, not necessarily supposed to be accurate to the theatrical coloration (though I assume he's tried for this in many scenes).