On Mon, 20 Dec 2010, Zane H. Healy wrote:
  The problem is not that it is letterboxed, as it
isn't.  It is at a strange
 aspect ratio.  If you've filled in the missing areas with dark blueish
 boarders the you have already letterboxed it. 
Isn't that just a matter of opinion? ;-)
An image with that strange aspect ratio is always displayed letterboxed on
my monitor, with or without filled borders...
Christian