Erodes black pixels on a GdPicture image or into an area of a GdPicture image defined by SetROI() function. 

This filter retains the black pixels surrounded in the 8 directions: E, NE, SE, S, SW, W, NW, N. His action is more sensitive than FxErode4. 

This function should be use only on bitonal images.

public GdPictureStatus FxBitonalErode8(
    int ImageID
);

Public Function FxBitonalErode8(
    ByVal ImageID As Integer
) As GdPictureStatus

A member of the GdPictureStatus enumeration.