This is an excellent technique when you want to focus on some unique portion of an image. Standard techniques in Photoshop for doing something similar include selecting a new layer above the Background Layer of the image, feathering the selection, then inverting the selection, and then filling the inverted selection with a color, thus creating a sort of vignette. The method I'm going to show is a lot less task oriented and uses the Lighting Effects Filter in Photoshop. Let's begin....