I've had that problem with getting a little of the background along with the picture quite a few times. It's called "matting" in Photoshop. You can get rid of it by contracting the selection, but this might also chop off miniscule pieces of the actual image. Photoshop has a tool for getting rid of black or white matting. Go to Layer, Matting, and click on Remove Black Matte or Remove White Matte as applicable. If the matting is neither black nor white, you can use Layer, Matting, Defringe and select the number of pixels you want to remove all the way around. Gromit