In the high quality cubic interpolation mode, the sharpness level of the scaling filter as a float between 0 and 1. The values are unitless. You can use sharpness to adjust the quality of an image when you scale the image down. The sharpness factor affects the shape of the kernel. The higher the sharpness factor, the smaller the kernel.

'宣言
 
Public Property Sharpness As System.Single

public System.float Sharpness {get; set;}