The entire window does not need to be visible for you to capture it. As you move the cursor over an application window, the window will be highlighted. The cursor will change to a camera, and you can move it around the screen.

To capture a specific application window, press and hold Command-Shift-4 then tap on the Spacebar.

When you release the mouse button, you can paste the screen shot to another application. A cross-hair cursor will appear and you can click and drag to select the area you wish to capture.

To copy a portion of the screen to the clipboard, press Command-Control-Shift-4.When you release the mouse button, the screen shot will be automatically saved as a PNG file on your desktop following the same naming convention as explained on the first tip above. To capture a portion of the screen, press Command-Shift-4.The screen shot will be placed on your clipboard for you to paste into another program like PowerPoint, Word, Photoshop, etc. To copy the entire screen, press Command-Control-Shift-3.The screen shot will be automatically saved as a PNG file on your desktop with the filename starting with “Picture” followed by a number, example Picture 1, Picture 2, and so on. To c apture the entire screen, press Command-Shift-3.Here's a summary of all the keyboard shortcuts you can use to capture your screen in Mac OS X. A screen shot is an image of your computer desktop or an active window. The Macintosh operating system has always made it easy to capture a screen shot.

Mac os paste shortcut