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Applies a soft edges effect to the current image.
The soft edges effect deflates all non-transparent areas of an image by a specified amount, then applies a Gaussian blur to make the border smooth.
public void ApplySoftEdges(Color? backColor, int inflationRadius = -6, int gaussianBlurRadius = 9)
Public Sub ApplySoftEdges(backColor As Color?, Optional inflationRadius As Integer = -6, Optional gaussianBlurRadius As Integer = 9)