Sharpness and Blur
Activate the Sharpness/Blur effect, either from the <Editing> drop down in the Recipe panel or by pressing [U].
The editing gauges are:
0% to 100%
This will add more sharpness to the overall image.
This will add more sharpness but only to the lighter colors of the image. The level of the sharpness applied depends on the tone of each pixel. The lighter the pixel, the more sharpening is applied.
This will make sharp edges look smoother.
This will blur the image