The amount of blur to be applied to the alpha channel of the image. You can compute the blur radius of the kernel by multiplying the standard deviation by 3. The units of both the standard deviation and blur radius are DIPs. This property is the same as the Gaussian Blur standard deviation property.

'宣言
 
Public Property BlurStandardDeviation As System.Single

public System.float BlurStandardDeviation {get; set;}