On Mon, 20 Dec 2010, Christian Corti wrote:
  I don't think so, no software can fill the missing
top and bottom parts
 (and the image already *is* letterboxed...). I don't want to crop the left
 and right sides, and I don't want to stretch the image vertically. For
 now, I've filled the borders with a dark blueish color. 
So, is anybody here good enough at PhotoShop or equivalent to add some
more content to extend it?  Maybe some Space Invaders ships above?