Simplest way I can think of is to go to Image>Canvas size. Make sure your background colour is set to black(hit "d" and then "x") first.
Another way... Create a new layer on top of the pic's layer and fill that layer with black. Now hit "ctrl"-"a", it will slect everything in that layer. Go to Select>Modify>Contract and enter in how many pixels you want to contract your selection(how thick your border will be).
Call me Brian.
P.S. This is what part of the alphabet would look like if Q and R were eliminated.
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