I own a copy of Sculpting the Galaxy, a book that's nothing but photos of the props. The Star Destroyer models, even after RotJ, were very clearly white or a very light grey. A couple shades lighter than the color of the Falcon.
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Are ISDs white or are they grey?
Well the same model can be either. The top photo is a good illustration. Where the ISD bridge is in shadow it looks blue-grey. Where it is in sunlight it looks almost white. If it was in strong sunlight it would look more like the Rogue One photo shown earlier. Perhaps the classic ISD photo from ANH shown earlier was white but in subdued lighting.
In the end it depends on how sunny it is in space. Ok then, how close your ship is to the centre of the star system that you are currently bringing order, peace and the Emperor's justice to.