screen grab for screenshot

[Peter S Galbraith <GalbraithP@dfo-mpo.gc.ca>]

How does one grab an image of the root window (containing many
window) while the mouse is in the process of selecting in a menu?

- Using ImageMagick's display's grab function, I enter a time
  delay and select a menu in Emacs.  I get the error:

   display: Unable to grab the mouse.

  (I think I'd get only the Emacs window if it worked anyway)

- Using xv's grab function, I enter a delay and select a menu in
  Emacs.  I get an image of the Emacs window without even the
  menu I'll pulling down.

Can gimp do this? (It's not installed yet, but that's easy to
remedy)

Thanks,
-- 
Peter Galbraith, research scientist          <GalbraithP@dfo-mpo.gc.ca>
Maurice Lamontagne Institute, Department of Fisheries and Oceans Canada
P.O. Box 1000, Mont-Joli Qc, G5H 3Z4 Canada. 418-775-0852 FAX: 775-0546
    6623'rd GNU/Linux user at the Counter - http://counter.li.org/