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Replacing a background

There are a number of ways of doing this as per Paul's link - although I usually find it's necessary to use layer masks either to fine tune the details or do the whole thing. A couple of things to bear in mind though-
1) if you're using the pen or eraser tool to cut the image out, getting the correct softness of your brush is vital - a hard edged brush used on a soft pic or vica versa will look obviously wrong
2) one you've cut the image out, using dodge and burn tools on the edges to burn shadows (if it's a dark background) or dodge highlights (light background) to help tie it in more with the new background.
Tommy
1) if you're using the pen or eraser tool to cut the image out, getting the correct softness of your brush is vital - a hard edged brush used on a soft pic or vica versa will look obviously wrong
2) one you've cut the image out, using dodge and burn tools on the edges to burn shadows (if it's a dark background) or dodge highlights (light background) to help tie it in more with the new background.
Tommy