PixelSetColor Method (GdPictureImaging) - GdPicture.NET API Reference

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

'Declaration
 
Public Function PixelSetColor( _
   ByVal ImageID As Integer, _
   ByVal DstLeft As Integer, _
   ByVal DstTop As Integer, _
   ByVal PixelColor As Color _
) As GdPictureStatus

public GdPictureStatus PixelSetColor( 
   int ImageID,
   int DstLeft,
   int DstTop,
   Color PixelColor
)

public function PixelSetColor( 
    ImageID: Integer;
    DstLeft: Integer;
    DstTop: Integer;
    PixelColor: Color
): GdPictureStatus;

public function PixelSetColor( 
   ImageID : int,
   DstLeft : int,
   DstTop : int,
   PixelColor : Color
) : GdPictureStatus;

public: GdPictureStatus PixelSetColor( 
   int ImageID,
   int DstLeft,
   int DstTop,
   Color PixelColor
)

public:
GdPictureStatus PixelSetColor( 
   int ImageID,
   int DstLeft,
   int DstTop,
   Color PixelColor
)

Parameters

ImageID: GdPicture image identifier.
DstLeft: Value that specifies the x-coordinate (column) of the pixel.
DstTop: Value that specifies the y-coordinate (row) of the pixel.
PixelColor: The color to apply, as Color object. A suitable color value can be obtained by using the ARGB() method.

Return Value

A member of the GdPictureStatus enumeration.

Getting the red channel histogram of a jpeg image and creating an image representing this histogram.

C#

using (GdPictureImaging gdpictureImaging = new GdPictureImaging())
{
    int imageID = gdpictureImaging.CreateGdPictureImageFromFile("image.jpg", false);
 
    // Get the red channel histogram and the image dimensions.
    int[] histo = new int[256];
    gdpictureImaging.HistogramGetRed(imageID, ref histo);
    int count = gdpictureImaging.GetWidth(imageID) * gdpictureImaging.GetHeight(imageID);
 
    gdpictureImaging.ReleaseGdPictureImage(imageID);
 
    // Create an image representing the histogram. 
    // The image has the same width as the histogram and its height is 1000.                
    int histogramID = gdpictureImaging.CreateNewGdPictureImage(256, 1000, 24, Color.White);
    for (int i = 0; i < 256; i++)
    {
        int value = histo[i] * 1000 / count;
        for (int j = 0; j < value; j++)
        {
            gdpictureImaging.PixelSetColor(histogramID, i, j, Color.Red);
        }
    }
 
    gdpictureImaging.SaveAsPNG(histogramID, "histo.png");
    gdpictureImaging.ReleaseGdPictureImage(histogramID);
}

Reference

GdPictureImaging Class
GdPictureImaging Members
PixelGetColor Method
ARGB(Byte,Byte,Byte,Byte) Method