The Sharpen tool improves the clarity of an image by increasing the color contrast between pixels. To quickly access this tool and switch between the Blur, Sharpen, and Smudge tools press R.
The tool's parameters will be shown in a floating box over an image (by right-clicking the mouse) and also in the Settings Panel.
To change a parameter enter a numerical value in the parameter's field and press Enter (Mac: Return) or adjust the slider.
|Hardness = 30%||Hardness = 95%|
|Changing Sharpness By Adjusting Contrast|
|Amount = 20%||Amount = 210%|
|Increasing Clarity by Adjusting the Amount of Edge Sharpness|
|Radius = 3.0||Radius = 18.0|
To enhance sharpness along a straight line, select a starting point with the left mouse button, then, while keeping Shift pressed, move the cursor to the end point and release Shift. If Shift is not released, a new line will be drawn each time the mouse is clicked over the image.