[users] OF lowers the resolution of exported bitmaps

[Maier Matthew P C2C USAFA/CS40]

I'm using version 2.2.1
I'm trying to combine multiple screenshots from Google Maps into a single 
image.  I've got them all lined up and each is of sufficient resolution to read 
the street names.  However, when I select them all and export them the 
resolution of the resulting image is too low to read the text.  This happens 
with BMP, JPEG, GIF, PNG, etc.
However, if I export them as a PDF, it retains the high resolution.  Also, if I 
export only one of the screen captured images it also retains the high 
resolution.
I've gone through the help file, the issue tracker, and the wiki but I can't 
find any information on this problem.