CountUniqueColors Method (GdPictureImaging)

In This Topic

Counts the number of unique colors in a GdPicture image or into an area of a GdPicture image defined by SetROI() method.

Syntax

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

'Declaration
 
Public Function CountUniqueColors( _
   ByVal ImageID As Integer _
) As Integer

public int CountUniqueColors( 
   int ImageID
)

public function CountUniqueColors( 
    ImageID: Integer
): Integer;

public function CountUniqueColors( 
   ImageID : int
) : int;

public: int CountUniqueColors( 
   int ImageID
)

public:
int CountUniqueColors( 
   int ImageID
)

Parameters

ImageID: GdPicture image identifier.

Return Value

The number of unique colors.

Remarks

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

This method requires the Image Documents component to run.

Example

Showing the number of unique colors on a GdPicture image.

using (GdPictureImaging gdpictureImaging = new GdPictureImaging())
{
    int imageID = gdpictureImaging.CreateGdPictureImageFromFile("image.jpg", false);
 
    // Count and display the number of colors.
    int colorCount = gdpictureImaging.CountUniqueColors(imageID);
    MessageBox.Show("Number of unique colors is " + colorCount, "Colors count", MessageBoxButtons.OK, MessageBoxIcon.Information);
    gdpictureImaging.ReleaseGdPictureImage(imageID);
}

Reference

GdPictureImaging Class
GdPictureImaging Members
SetROI Method
ResetROI Method