How to take screenshots on the iPhone, iPad, and in Mac OS X
On the iPhone / iPad
Taking screenshots on an iPhone running software 2.* (or an iPad) is easy: Simply press the Sleep / Wake and Home buttons simultaneously to save an image of the screen to your Photo Library.
To download the images from your iPhone, you can use iPhoto, Image Capture, or a similar photo management application. Alternatively, you can email them to yourself.
On the Mac
To take screenshots in Mac OS X you can use the "Grab" application in your "/Applications/Utilities" folder, the built-in keyboard shortcuts, or the command line screencapture utility.
Like Grab, the screencapture command line utility gives you the option of taking Selection, Window, Screen, or Timed screenshots, but it expands upon Grab's functionality somewhat by letting you specify a timer interval, mute the screen capture sound effect, specify where the output image should be saved, etc.
Strangely, the keyboard shortcuts for taking screenshots in Mac OS X are a little unintuitive. However, you can find (and change) all the screenshot key combinations in the "Keyboard & Mouse" preference pane in System Preferences.
By default, the shortcuts are:
⇧⌘-3 (shift-command-3):
Save a picture of the screen as a file on your Desktop.
⌃⇧⌘-3 (control-shift-command-3):
Copy a picture of the screen to the clipboard.
⇧⌘-4 (shift-command-4):
Save a picture of the selected area as a file on your Desktop.
⌃⇧⌘-4 (control-shift-command-4):
Copy a picture of the selected area to the clipboard.
⇧⌘-4, followed by space (shift-command-4, followed by space):
Save a picture of the selected window as a file on your Desktop.
⌃⇧⌘-4, followed by space (control-shift-command-4, followed by space):
Copy a picture of the selected window to the clipboard.
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