One of the problems we face when trying to make things really sharp is that things tend to look oversharpened, or worse yet, our photos get halos (tiny glowing lines around edges in our images). So, how do we get our images to appear really sharp without damaging them? With a trick, of course. Here’s the one I use to make my photos look extraordinarily sharp without damaging the image:
Open your image, and then apply the Unsharp Mask filter (found under the Enhance menu) to your image, just as we’ve been doing all along. For this example, let’s try these settings—Amount: 65%, Radius: 4, and Threshold: 3—which will provide a nice, solid amount of sharpening.
Press Ctrl-J (Mac: ...