Softly patterns an image by choosing a maximum or minimum color value for pixels in the specified radius. The result erodes or dilates the light or dark areas of your layer into soft, blocky regions.
Adjust this filter using the parameter controls in the Filters Inspector:
Mode: Sets the mode of the effect. The following modes are available: Minimum and Maximum.
Radius: Sets the radius of the effect.
Mix: Sets the percentage of the original image to be blended with the filtered image.