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If you do that then you have to decide what the size of the image is forehand.
If you are on that layer – select – copy – new – then it will automatically make the correct sized "box" with which you can paste the copy onto.
When you create a new file, there’s a little trick that many people, even people who have been using Photoshop for a long time, often don’t know.
If you bring up the New dialog, then click on the Window menu and choose a file you already have open, the New dialog will automatically fill in the size of whatever file you have selected.
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