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I want to send a book in the mail, and I need to know how many stamps I need to put on it without putting too many and wasting stamps.

So photoshop wizzards can replace a bland background with a more exciting one. How do they do this? I know one way is by keeping the background white or green and adding an image, but I don't even know how they do that. I'd really like to learn this, so the person that gives me instructions...