A topic that should be one of the most common things for photoshop and/or green screen montage.
When changing the background for a subject you need to alter the subject's coloration in order to match the background.
One method would be to find a similar color for example white and try to make it match to the same color on the background.
What else is there? I'm hoping there's another method that I could use on pictures that don't have known colors.
edit: I can usually do it by experimenting a little but it would be nice to know a better technique.
(Edited by Arthurio on 10-01-2011 20:21)