PaletteGetColorsCount Method (GdPictureImaging)

In This Topic

Returns the number of colors contained into the color palette of a GdPicture image.

Syntax

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

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

public int PaletteGetColorsCount( 
   int ImageID
)

public function PaletteGetColorsCount( 
    ImageID: Integer
): Integer;

public function PaletteGetColorsCount( 
   ImageID : int
) : int;

public: int PaletteGetColorsCount( 
   int ImageID
)

public:
int PaletteGetColorsCount( 
   int ImageID
)

Parameters

ImageID: GdPicture image identifier.

Return Value

Number of Imaging.Colors.

Example

Determining the palette entries count of the selected image.

Getting information about the palette entries count of the selected image and showing the result on the screen.

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("");
 
    if (gdpictureImaging.IsPixelFormatIndexed(imageID))
    {
        int entriesCount = gdpictureImaging.PaletteGetColorsCount(imageID);
        Console.WriteLine("Image contains palete with {0} color entries.", entriesCount.ToString());
    }
    else Console.WriteLine("Image do not contain indexed colors!");
 
    // Release used resources.
    gdpictureImaging.ReleaseGdPictureImage(imageID);
}

Getting information about the specific palette entry of the selected image and showing the result on the screen.

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("");
 
    if (gdpictureImaging.IsPixelFormatIndexed(imageID))
    {
        int entriesCount = gdpictureImaging.PaletteGetColorsCount(imageID);
 
        if (entriesCount > 255)
        {
            System.Drawing.Color entryColor = gdpictureImaging.PaletteGetEntry(imageID, 130);
            Console.WriteLine("Color value of palette entry [130] is: {0}", entryColor.ToString());
        }
        else Console.WriteLine("Image do not contain palette with 256 colors!");
    }
    else Console.WriteLine("Image do not contain indexed colors!");
 
    // Release used resources.
    gdpictureImaging.ReleaseGdPictureImage(imageID);
}

Reference

GdPictureImaging Class
GdPictureImaging Members