You can take a snapshot of your screen or an individual application window using any of the following methods:
You can add the button to any panel. For information on how to do this, see Section 1.3.4, “Adding Applets and Applications to the Panel”. After you have added the button, click the button to take a snapshot of the entire desktop.
Press the Print Screen button to take a screen shot of the entire desktop. Press Alt+Print Screen to takes a screen shot of the currently active window or dialog box.
Click +++.
You can use the gnome-panel-screenshot command to take a screen shot. This command takes a screen shot of the entire screen, and displays the dialog box, which you can use to save the screen shot.
You can use the following options with the gnome-panel-screenshot command:
When you take a screen shot, the dialog box opens. To save the screen shot as an image file, enter the filename for the screen shot and choose a location from the drop-down list.
You can also use The GIMP to take screen shots. In The GIMP, click ++, select or , then click .