I worked on just about all of my photos from the folk scene that are posted now at http://rudegnu.com/art_thieme.html
PhotoShop is pretty amazing but even Ansel Adams did strange dodging things to most of his photos to enhance aspects he wanted more luminescent than they were on the negative. I wonder what he'd've done with Photo Shop!? What we need to do is just get used to the fact that photography has changed. National Geographic told everyone when they had changed a photograph. They thought that putting that mark on the picture to indicate the change ought to be the way everyone ought to do it now that digital altering is the name of the game all over.
One of my photos was of Studs Terkel and Win Stracke sitting in front of a book case that had a Coke bottle on it. My friend Larry Rand removed the Coke Bottle---and it made a better photo out of it.