Use the Photoshop Unsharp Mask filter to sharpen your landscape photos

Let's start with the photograph we worked on in levels:

To use the Unsharp Mask filter, choose Filter in the menu bar, then Sharpen and Unsharp Mask

There are three settings in the Unsharp Mask filter. Amount, Radius, and Threshold. The Amount setting determines the percentage increase in contrast between the pixels. I like to keep it modest, between 20% and 40%.

The Radius setting determines how many pixels near the objects' edges will be changed. The value you choose depends on the size and resolution of the image, but you'll want to keep it low. Try a value between 1 and 3 to start.

The threshold setting determines where sharpening will occur. The lower the value, the greater the portion of the image that will be affected. Use a higher setting to restrict sharpening to areas with higher contrast. The larger your image, the higher a setting you'll want to use.