Screenshots, pictures of a computer screen, are often used to illustrate software reviews and workflow tutorials. They’re particularly useful to the Ask Different community. It’s sometimes difficult to explain multiple settings in a preference pane or application dialog box. Many questions and answers can be improved by including images. Best of all, it’s free and easy. Mac OS X includes all of the tools you need to take great screenshots and the process is painless once you develop an efficient workflow.
The specifics of this tutorial are geared towards Mac OS X 10.7 Lion. The basic steps for taking a screenshot are the same for previous versions of Mac OS X going back as far as I can recall, but some details and the capabilities of Preview will vary according the version of the OS you’re using.
Taking a picture of the entire desktop is simple. Press ⌘(command) + shift + 3 simultaneously on the keyboard and you’ll hear a shutter click (assuming your Macintosh audio isn’t muted). In a moment, an image file will appear on the desktop. If you want to copy the captured image directly into the clipboard without creating a file—to paste directly into another application—use ⌃(control) + ⌘(command) + shift + 3.
This is a screenshot of my desktop. That’s a screenshot file in the upper right corner.