Performs black & white effect on a GdPicture image or into an area of a GdPicture image defined by SetROI() function.

public GdPictureStatus FxBlackNWhite(
    int ImageID, 
    BitonalReduction Mode
);

Public Function FxBlackNWhite(
    ByVal ImageID As Integer, 
    ByVal Mode As BitonalReduction
) As GdPictureStatus

A member of the GdPictureStatus enumeration.