'Declaration
 
Public Function ConvertTo8BppGrayScaleAdv( _
   ByVal ImageID As Integer _
) As GdPictureStatus

public GdPictureStatus ConvertTo8BppGrayScaleAdv( 
   int ImageID
)

public function ConvertTo8BppGrayScaleAdv( 
    ImageID: Integer
): GdPictureStatus; 

public function ConvertTo8BppGrayScaleAdv( 
   ImageID : int
) : GdPictureStatus;

public: GdPictureStatus ConvertTo8BppGrayScaleAdv( 
   int ImageID
) 

public:
GdPictureStatus ConvertTo8BppGrayScaleAdv( 
   int ImageID
) 

Parameters

ImageID

GdPicture image identifier.

Return Value

The algorithm used uses the following formula based on the rgb color channel values 0.2126F * r + 0.7152F * g + 0.0722F * b.

Greyscaling narutal images works better with this method than with ConvertTo8BppGrayScale().

This method requires the Image Documents component to run.

Reference

GdPictureImaging Class
GdPictureImaging Members
ConvertTo8BppGrayScale Method