One of the nice things about the app is that it lets you save several "Punch Shots" for use later. This way, you can even paste multiple Punch Shots onto a single background.
For backgrounds for your Punch Shots, Photo Punch lets you choose from your gallery, take a new photo, or even search the Web for images using the built-in search tool.
Photo Punch's auto-selection works best when your foreground item is clearly differentiated from its background. Here, you can see an accurate selection.
Here, you can see Photo Punch having some trouble differentiating a dark-colored shoe from the carpet. What's more, the unpredictable manual adjustment tool was unable to capture the shoe as well.