Not to long ago I gave my opinion on the subject and asked for comments. There were none at that time so lets have them...
WLH said:Here is my opinion on the subject. Please feel free to disagree. First it is very difficult to prove if an image has been photoshopped. Before digital photography those individuals that were more experienced often developed and printed their own photos. Once the negative was developed they could use their skill to improved the image by a variety of means in the darkroom. Including the choice of paper, use of filters in printing, dodging, burning, lens or easel tilt just to mention a few basic methods. Then there was retouching which was done directly on the negative or the finished print. In effect what they were doing was “photoshopping”. I can't recall that any of these techniques were forbidden when entering a photo into a contest. Today with digital photography “photoshopping” IMO is nothing more that what was once done in the darkroom. Photoshopping is a necessary skill for the advanced amateur today as much as a darkroom was for the advanced amateur 20 or 30 years ago.