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The pre-process section lets you set a threshold for controlling where the Starglow effect appears, and lets you use a built-in circular mask to restrict the glow area.
Threshold defines the minimum level for the highlights. A low value will give more glow in the image, and a high value will make only the very bright areas glow. The images below show Starglow output using a shot of the sun on water with different Threshold values.
Threshold Soft: This controls the softness of the border between lowlights and highlights.
Use Mask: Check this to enable the internal circular mask.
Mask Radius: This control sets the size of the internal circular mask in pixels.
Mask Feather: The Mask Feather value sets the softness of the internal circular mask.
Mask Position: Define the center point of the circular mask with this control.