The Sharpen tool is used to make a specific area of an image sharper.
In the Tool Options pane, customize the Sharpen tool:
Brush Size: Drag the Brush Size slider to adjust the size of the Sharpen tool brush. Hold down thekey to extend the range of the Brush Size slider beyond 100%. You can also manually enter a value from 0% to 200%.
Tip: You can use theand keys on your keyboard to change the size of the Sharpen tool brush.
Softness: Drag the Softness slider to adjust the softness of the edges of the Sharpen tool brush. With softer edges, the sharpened areas will usually blend in better with the rest of the image.
Strength: Drag the Strength slider to adjust the intensity of the sharpening effect.
Select a tonal range to sharpen:
Brush over the area of your image you’d like to sharpen.
Show Original: Click the Show Original button or press thekey on your keyboard to see what the image looked like before you sharpened anything in it.
Click Reset to discard all the current changes made with the Sharpen tool.
Note: Images shot with digital cameras are often a bit soft in focus because of the demosaic filter applied by the camera’s processor. The Sharpen tool is designed to add focus to images that are already relatively sharp — as opposed to completely blurry or out of focus images. You can also use the Sharpen adjustment to reduce the softness of images taken with digital cameras.