If you want to focus attention on something within your image, applying a wide vignette that acts like a soft light is a great way to do this (which is really just an alternative to the previous tutorial). What you’re doing is creating a dark border that will burn in the edges of your image. Here’s how to do just that:
Open the photo to which you want to apply a burned-in edge effect. Just so you know, what we’re doing here is focusing attention through the use of light—we’re burning in all the edges of the photo (not just the corners, like lens vignetting, which I usually try to avoid), leaving the visual focus in the center of the image.
Go to the Layers palette and add a ...