AdmNelson
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this is true, when we went to go watch them film on lower wacker we were on the river and one of the crew guys (who was very cool and tried to help us get a good look at them filming) said that he saw aaron eckhart but he had abunch of dots of his face for the cgi.
Here's one explanation (I do computer graphics/visual effects for a living):
When Dent gets wounded (acid in his face, or whatever), they might have the "scarring effect" happen as he's moving, screaming and so on. They could do a "digital makeup" job by tracking wound effects to his face -- or they could do the reverse, by having conventional makeup already applied to his face, but digitally painted out with "clean" skin textures, which then dissolve. They could also have something fairly gruesome at first (his teeth revealed, etc.) until Dent covers up his wounding with his own makeup, or some other technique (bandages, etc.)
Both of these "digital makeup" techniques have been used in recent films. In particular, "Passion of the Christ" used these -- either tracking digital wounds to an actor's skin, and/or covering existing makeup with digitally-tracked clean skin, then ripping it away. (The motion-tracking dots are also digitally painted out, of course.)
-- Admiral Nelson