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Need to know how large you can print your photo? Or how to save a high resolution file? Or why you have to crop your image if you want to print a 4x6 as an 8x10? The answers are all here!
To make a document the same size as another open document, Go to the Image Size or Canvas Size dialog boxes (Image Image Size or Canvas Size). Then while the dialog box is open, go to Window and select any other open document which will be displayed at the bottom of the Window menu and Photoshop will automatically fill in the values for that image. Press OK and the image will resize.