Well, they have to be white, right? I mean, I saw that clip over and over again and the colors looked fine to me, Star Wars isn't faded. ESB was completely maroon, but Star Wars was pretty much intact. Tatooine looks like Tatooine, the sky was blue, the stormtroopers were white... The only difference with Harmy's restoration is that his despecialized simulates the use of a 70's projector bulb, that gives the picture a warm tint, which the Ravenna print didn't have (at least judging from that clip). The main clue is the color of Greedo's head.