but I'm afraid I disagree with you."
But you just agreed with me.
If that's the color her dress is in that scene, then it should be the same in the rest of the scenes, unless you think she changed her warddrobe.
"also, publicity photo's of the day, show her dress to be white. they can't all be wrong."
Which means the Tantive scene is wrong? The color of her dress seems pretty consistent throughout that scene. I think you need to be more focused on the dress, rather than the colors around it. This can have an effect on the perceived color of the dress.
I might also point out that one reason the dress isn't completely white is because it is made of a very thin material, and you are seeing some skin tones through the dress (this effect is more pronounced where the dress rests on her shoulders.) If you up the white on it, you are ultimately missing out on some important "details" - i.e. the trash compactor scene. There's a reason why they had to tape her boobs down.
