Unsharp Mask
Creates an effect similar to Sharpen, but provides more options to refine and control the amount of sharpening applied to the image.
Adjust this filter using the parameter controls in the Filters Inspector:
Radius: Sets the amount of the mask’s effect.
Amount: Sets the amount of the multiplier used to sharpen the layer’s edges.
Threshold: Sets the threshold of luminance difference to be considered as a high contrast range, between 0 and 1.
Horizontal: Sets the horizontal width of the unsharp mask.
Vertical: Sets the vertical scale of the unsharp mask.
Mix: Sets the percentage of the original image to be blended with the filtered image.