Sharpening increases the contrast of neighboring pixels. The Sharpen Brush Tool gives you full control over the areas that are sharpened and has a cumulative affect. You can easily apply clarity and unsharp mask sharpening selectively with a few strokes of a brush!
Settings
The following settings can be adjusted from the context toolbar:
Width—the brush (stroke) size in pixels. Type directly in the text box or drag the pop-up slider to set the value.
Opacity—how see through the brush is. Type directly in the text box or drag the pop-up slider to set the value.
Flow—how fast the brush effect is applied (1% is very slow, 100% is immediate). Type directly in the text box or drag the pop-up slider to set the value.
Hardness—how hard the edges of the brush are. The brush appears softer as the percentage decreases. Type directly in the text box or drag the pop-up slider to set the value.
More—click to display the Brushes dialog to access advanced brush settings.
Force pressure to control size—Click to control brush size with pressure if using a pressure-sensitive device. This overrides brush defaults.
Mode—determines the sharpening effect to be applied. Select from the pop-up menu.
About the sharpening modes
The three modes available from the context toolbar have slightly different effects on the underlying pixels.