'Declaration

<DefaultValueAttribute(1)>
<DescriptionAttribute("The alpha (transparency) value that must be used when the image, which is received after the highpass filtering of source image, must be overlayed on the source image.")>
Public Property OverlayAlpha As Single

[DefaultValue(1)]
[Description("The alpha (transparency) value that must be used when the image, which is received after the highpass filtering of source image, must be overlayed on the source image.")]
public float OverlayAlpha { get; set; }

[DefaultValue(1)]
[Description("The alpha (transparency) value that must be used when the image, which is received after the highpass filtering of source image, must be overlayed on the source image.")]
public: __property float get_OverlayAlpha();
public: __property void set_OverlayAlpha(
   float value
);

[DefaultValue(1)]
[Description("The alpha (transparency) value that must be used when the image, which is received after the highpass filtering of source image, must be overlayed on the source image.")]
public:
property float OverlayAlpha {
   float get();
   void set(float value);
}

1 - the image, which is received after the highpass filtering of source image, must be overlayed on the source image without transparency;
otherwise - the image, which is received after the highpass filtering of source image, must be overlayed on the source image with transparency, which is specified by this property.
Default value is 1.