Gets or sets the gray texture to use with this effect. This is a dependency property.
A System.Windows.Media.Brush that specifies the gray texture to use with this effect. Default value is null (Nothing in VB).
You don't usually provide the gray texture manually. Instead, use the WindowLevelEffect(RasterImage image) or FillGrayTexture methods to create the texture from a LEADTOOLS Leadtools.RasterImage.