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Screenshot is a simple utility that lets you take pictures of your computer screen. Screenshots can be of your whole screen, any specific application, or a selected rectangular area. You can also copy the captured screenshot directly into the GNOME clipboard and paste it into other applications.
Screenshot allows you to take screenshots even when it’s not open: just press the PrtSc button on your keyboard, and a snapshot of your whole screen will be saved to your Pictures folder. Hold Alt while pressing PrtSc and you will get a screenshot of only the currently selected window.