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You set the inches and the number of pixels in each of those inches. Photoshop removes or adds data to fit the number of pixels in each of the inches you specified. Note: The original image used in the examples below is 4x4 inches, 100 ppi, 400x400 pixels at 468.8 KB.
For a 4 x 6 print, the image resolution should be 640 x 480 pixels minimum. For a 5 x 7 print, the image resolution should be 1024 x 768 pixels minimum. For an 8 x 10 print, the image resolution should be 1536 x 1024 pixels minimum. For a 16 x 20 print, the image resolution should be 1600 x 1200 pixels minimum. For a 20 x 30 print, the image resolution should be 1600 x 1200 pixels minimum. For a Wallet-size print, the image resolution should be 320 x 240 pixels minimum. Quality vs file size. This guide shows you the kind of quality you can expect when you're printing out your photos.