How can I take a snapshot of scope block after simulation & save it as JPG file from script

Hello, I have a xls file using which I am generating a signal builder. Once simulation is over,I want to compare the expected results(which are comong from signal builder) against actual results graphically(in scope as graphs)I am getting actual results from the model under test. Can anybody tell me how can I take screenshot/snap shot of the scope block & save it as JPG. If there is any command or script one can suggest it would be very helpful Thanks in advance Sameer.