To take a screenshot on Mac OS X, there are several solutions.
The first is to simultaneously press the keys "apple" + "Shift" + "3" (above the letters and not the numeric keypad). A PDF file (with "image") is automatically created on the desktop.
To capture a portion of the screen, press the keys "apple" + "Shift" + "4". The mouse cursor turns into a cross. Maintaining the mouse button pressed, the location of the screen to save. When you release the button, a PDF file is created on the desktop.
To keep a snapshot of the screen to the clipboard, add the "Ctrl", eg "Apple" + "Shift" + "Ctrl" + "3".
Finally, a utility screenshot is also available. Unroll Go / Applications / Utilities / Capture. Then select the Capture menu / selection or screen. You can save in Tiff format via the menu File / Save As.
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