With the space key held, moving the mouse will move the current size of the selection box around on the screen. In addition, if you start a selection of the screen with the cursor, you can adjust its location by holding the space key when the selection box is on the screen. If you press the space bar when the selection cursor appears, you can click individual windows (even if they are not in focus) to take a screenshot of them. The Shift-Command-4 keystroke has some additional options once invoked. Shift-Command-4: The "selection" mode will take a shot of the area outlined by dragging the cursor. Shift-Command-3: The basic screenshot will take an image of the full screen. Preview's screenshot capabilities may be convenient, but if you want a full set of screenshot options then your best bet is to either use Apple's keyboard shortcuts or the Grab utility (available in the /Applications/Utilities/ folder). When these functions in Preview are invoked, the resulting image will be placed in a new window from where you can annotate, crop, or otherwise edit with Preview's various utilities, and then save in the format of your choosing (PNG is the default). This is the classic screenshot option that most people may be accustomed to. This will take a full picture of the whole screen, which you can then select from and crop according to your needs. This is convenient for creating a full image of a single window, including its surrounding shadow, which can be nice for making presentations of screenshots. This option will make the mouse cursor highlight various windows onscreen, and when you click them, it will take a snapshot of the selected window. This is great if you want to use only a portion of the screen that includes multiple windows, without taking a full screenshot and then cropping at a later point.
This will display a crosshair cursor, which you can use to grab a section of your screen to include in the screenshot. To use Preview's screenshots function, open the program and go to the File > Take Screen Shot menu, followed by selecting one of the three options for taking a screenshot: Taking screenshots in Preview can be done from the File > Take Screen Shot submenu.
Generally this tool is used for viewing PDFs and image files, but it can also be used to scan documents, import files from cameras, and grab various types of screenshots. There are several options for creating screenshots in OS X, including Apple's "Grab" utility and the common keyboard shortcuts for doing so, but in addition to these, you can also use Preview.
If an error window pops up on screen, instead of describing it to a technician, it helps to snap a screenshot and send that to better show exactly what is going on. The ability to quickly save the content of your screen is a useful feature to have, especially if you are troubleshooting aspects of your system.
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