Soft Focus
Creates an effect similar to duplicating an object, applying the Screen blend mode to composite the object against itself, then blurring an overlapping layer—within a single filter. The Strength parameter controls how much of the blurred image is added back to the original image.
Adjust this filter using the parameter controls in the Filters Inspector:
Amount: Sets the radius of the blur.
Strength: Sets the amount of opacity of the blurred composite.
Horizontal: Sets the percentage of the maximum horizontal blur.
Vertical: Sets the percentage of the maximum vertical blur.
Crop: Sets whether the filtered image is sharply cropped at its original boundaries. When this checkbox is deselected, the filter affects the edges of the image.
Mix: Sets the percentage of the original image to be blended with the blurred image.