ConvertTo8BppGrayScale Method (GdPictureImaging)

In This Topic

Converts a GdPicture image to an 8-bit gray-scaled indexed color image. The color table has 256 entries.

Syntax

Visual Basic
C#
Delphi
JScript
Managed Extensions for C++
C++/CLI

'Declaration
 
Public Function ConvertTo8BppGrayScale( _
   ByVal ImageID As Integer _
) As GdPictureStatus

public GdPictureStatus ConvertTo8BppGrayScale( 
   int ImageID
)

public function ConvertTo8BppGrayScale( 
    ImageID: Integer
): GdPictureStatus;

public function ConvertTo8BppGrayScale( 
   ImageID : int
) : GdPictureStatus;

public: GdPictureStatus ConvertTo8BppGrayScale( 
   int ImageID
)

public:
GdPictureStatus ConvertTo8BppGrayScale( 
   int ImageID
)

Parameters

ImageID: GdPicture image identifier.

Return Value

A member of the GdPictureStatus enumeration.

Remarks

This method uses a basic grayscale color reduction algorithm, where all three color channels rgb have the weight.

Example

Converts selected image to an 8-bit gray-scaled indexed color image, and saves result into a TIF file.

using (GdPictureImaging gdpictureImaging = new GdPictureImaging())
{
    // Open an image file. An empty string allows the control to prompt for selecting a file.
    int imageID = gdpictureImaging.CreateGdPictureImageFromFile("");
 
    gdpictureImaging.ConvertTo8BppGrayScale(imageID);
    gdpictureImaging.SaveAsTIFF(imageID, "output.tif", TiffCompression.TiffCompressionAUTO);
 
    // Release used resources.
    gdpictureImaging.ReleaseGdPictureImage(imageID);
}

Reference

GdPictureImaging Class
GdPictureImaging Members
ConvertTo8BppGrayScaleAdv Method