Reading the novelization for Revenge of the Sith is very interesting, because you'll be reading an incredibly well-made dramatic scene with very well described visuals, remember "Oh right, this is a novelization! I should check to see how the movie adapted it!" and then you watch the scene and 70% of the dialogue is missing and the remaining 30% is incredibly stilted and also none of the cool and interesting visuals are there.
in Palpy's reveal scene, the novelization describes him as being veiled in shadow while tempting Anakin, with only the glint from his eyes visible in the darkness, and the author describes how it's evoking Palpy as a force of shadow and darkness itself.
And then in the movie, he just looks like this.
I like Ian McDiarmid and all, he does a great job as Palpy every time, but I do wish that we got more of a visual representation of what the novelization was trying to do.