Move the "Center" of a Desktop Background

Is there a way to move the desktop background when choosing the "Fill Screen" option? I have a portrait oriented picture of two standing people with their faces being near the top. When I set this picture as the background and chose "Fill Screen" it zooms in to the center of the picture, which is at chest level. Is there any way to move the picture up so it focuses on the faces, sort of like when chosing a Facebook profile picture?