Seeing The Real Thing
Most people open an image, make a selection, and then move the selected part into a new document to see how it looks. Instead, try moving the original image into the new document or background first. Then, while refining your selection in the Refine Edge dialog, under the View menu, choose On Layers (L). This will automatically show you your selected image on the new background, so you can see exactly what it’ll look like before finalizing the selection.
by Matt Kloskowski