You're new to the Mac, and searching in vain for the 'print screen' key, but your iMac keyboard is frustratingly devoid of an 'iGrab' button.

You decide Macs aren't all they're cracked up to be, and are about to hurl yours out of the window. But wait - it doesn't have to be that way.

Follow our OS X screengrab tips guide and you'll find out how to take perfect grabs - and if you're an old-hand at the Mac, read on anyway, and discover there's more to grabbing screens on the Mac than Command, Shift and 3.

Shortcuts to success

On the Mac, the magical shortcut for taking a screengrab is Command+Shift+3 (although this can be changed in the 'Screen Shots' sub-section of 'Keyboard Shortcuts' within the Keyboard & Mouse System Preferences pane).

By default, this takes a grab of the entire screen and places the resulting PNG file on your Desktop.

Although Apple doesn't provide a GUI for amending the grab file-format and save location, it's possible to change these settings. In our article Unlock Mac OS X apps' hidden features, we showed how you can use Terminal commands to change the format of grabs, toggle drop-shadow inclusion, and amend the save location.

However, you can instead use TinkerTool to do this - set your options in its General pane and logout.

Tinkertool

EASY TWEAKING: TinkerTool makes it simple to amend Mac OS X screengrab defaults

If you only want to grab a portion of the screen, press Command+Shift+4. The cursor will become a crosshair. Click-drag and then release and the selected selection will be sent to the Desktop.

Alternatively, if you require a grab of a component (window, menu, the Dock, etc.), press Space after Command+Shift+4. The crosshair will become a camera, which you move over an item to highlight it. Escape cancels the grab, and clicking an item confirms it.

Note that components are grabbed along with their drop-shadows, and you can hold Control when beginning a grab process (Command+Shift+3 or Command+Shift+4) to send the resulting image to the clipboard rather than the Desktop.

Cropped grabs

CROPPING: By pressing Space after Command+Shift+4, you can grab an individual screen component

Further shortcuts were introduced in Leopard: on dragging a selection, keep the mouse button held and then also hold Space to lock and move the selection; hold Option to resize with the centre of the selection as the anchor point; hold Shift to lock an axis based on the next cursor movement you make; and Shift+Option enables you to lock an axis and resize the selection with its centre as the anchor point.