[Filter] - [Diffuse]
Apply the Diffuse effect on an image.
[Diffuse] dialog box lets you set up the Diffuse intensity on an image.
Proceed to apply the Diffuse effect by clicking [OK].
Specify the maximum distance of Diffuse effect in pixel.
Specify the drawing mode when applying the Diffuse.
You can select from [Normal]・[Darken]・[Lighten].
Specify the range shape of Diffuse effect, either with a rectangluar or a circle.
If you check, the range shape will become circle. If you do not check, the range shape will become a rectangluar.