When you enable bezel correction, a bezel-corrected version of each surround resolution is added to the list of available resolutions - both within games as well as within the NVIDIA Control Panel. It is similar to looking through a cockpit window where the window frames block your view. This produces a more continuous image across the displays and provides a more realistic experience. With bezel correction, part of the game view is hidden behind the display bezel so that the bezel appears to be part of the game.
