Image Window Position and Zoom
 
 
 
  Press: To:
  Ctrl+up arrow Zoom in
  Ctrl+down arrow Zoom out
  Ctrl+Shift+up arrow Nudge image window up
  Ctrl+Shift+down arrow Nudge image window down
  Ctrl+Shift+left arrow Nudge image window left
  Ctrl+Shift+right arrow Nudge image window right
  spacebar-drag Pan image window
  Home Toggle between current and default pan and view settings
  Ctrl-click (Home button) Frame the current image in the current viewport