Lock Screen Screenshots

I want to take a screenshot of my Lion lock screen to highlight the new circular user portraits.

Is there an easy way to take a screenshot of the OS X lock screen?

You can do this via the command line if you can ssh into the machine, using the screencapture command.

Take a look at this question for some more info.

I know this is old but this is a suitable solution for Lion through to Yosemite and it's pretty obvious.

The commands is:

sleep 5 && screencapture -t jpg -S ~/Desktop/screenshot.jpg

This will take a screencapture in 5 seconds and save it to ~/Desktop/screenshot.jpg.

You can quickly jump to the lock screen with Ctrl+Shift+Power or for older macbooks Ctrl+Shift+Eject.