IsBitonal(Int32) Method

In This Topic

Determines whether a GdPicture image or the area defined by SetROI() method is composed of black and white pixels only. This method uses a linear formula to determine the color intent. To obtain more accurate result the ColorDetection() method should be used instead.

Syntax

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

'Declaration
 
Public Overloads Function IsBitonal( _
   ByVal ImageID As Integer _
) As Boolean

public bool IsBitonal( 
   int ImageID
)

public function IsBitonal( 
    ImageID: Integer
): Boolean;

public function IsBitonal( 
   ImageID : int
) : boolean;

public: bool IsBitonal( 
   int ImageID
)

public:
bool IsBitonal( 
   int ImageID
)

Parameters

ImageID: GdPicture image identifier.

Return Value

True if it is a bitonal image, else False.

Remarks

Use the GetStat() method to check if this method has completed successfully.

This method uses a linear formula to determine the color intent. To obtain more accurate result the ColorDetection() method should be used instead.

Example

Saving an image to tiff ccitt IV or jpeg depending whether it is bitonal or not.

using (GdPictureImaging gdpictureImaging = new GdPictureImaging())
{
    int imageID = gdpictureImaging.CreateGdPictureImageFromFile("image.bmp");
 
    // Save the image to tiff ccitt iv in case it is bitonal otherwise save to jpeg.
    if (gdpictureImaging.IsBitonal(imageID))
    {
        gdpictureImaging.SaveAsTIFF(imageID, "image.tif", TiffCompression.TiffCompressionCCITT4);
    }
    else
    {
        gdpictureImaging.SaveAsJPEG(imageID, "image.jpg", 75);
    }
 
    gdpictureImaging.ReleaseGdPictureImage(imageID);
}

Reference

GdPictureImaging Class
GdPictureImaging Members
Overload List
ColorDetection Method