hey ms leopard..... what are you refering to as a background image... you can save a chart using save under the the files tab, or save as html...... if your wanting to create an image of your entire screen, which would make an image of eveything on the monitor, you can use the keyboard 'print screen' key.....
are you trying to create a watermark for copyright protection..... really not sure what your trying to do, holler back.....h