>how is there an image waiting behind the person you just photoshopped out?
There isn’t. Part of learning to be proficient at using Photoshop is learning to recreate missing parts of an image by copying other parts (or even parts of completely different photos) and blending them together. Photoshop can try to do some of that for you, but the best results are obtained by an actual, skilled person.
Photoshop has a number of tools that help with this, probably one of the more useful ones is the clone tool. The reconstruction of what’s behind doesn’t come from the photo (unless it’s available). Very often what these artists do is come up with something reasonable and believable using the tools Photoshop offers.
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