
Next, click on "File" in the menu bar, then "Save As" to save the image as your desired format (JPEG, JIFF, etc.) and with your preferred size. Open the image in Preview by double-clicking it.
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Pressing Command-Shift-3 will take a screenshot of the entire screen, while Command-Shift-4 will let you take a screenshot of just a selected area of the screen instead.

This video demonstrates how easy it is to take a screenshot with shortcuts in Mac OS X.
