What you learned: Sharpen a photo using the Unsharp Mask filter
How sharpening works
Sharpening works by increasing contrast at edges in the image.
Zoom to 100%
Double-click the Zoom tool in the Tools panel to zoom in to 100%, so you can accurately judge sharpness.
Convert for Smart Filters
Tip: Almost every photo will benefit from sharpening, but be careful not to over-sharpen.
![](https://i.ytimg.com/vi/vsnTthQ7ADo/mqdefault.jpg)