This is a sharpening technique that doesn’t use the Unsharp Mask filter, but still leaves you with a lot of control over the sharpening, even after it’s applied. It’s ideal to use when you have an image that can really hold a lot of sharpening (a photo with a lot of edges) or one that really needs a lot of sharpening.
Open a photo that needs edge sharpening.
Duplicate the Background layer by going under the Layer menu, under New, and choosing Layer via Copy (or pressing Ctrl-J [Mac: Command-J]). This will duplicate the Background layer onto a new layer (Layer 1).
Go under ...