Public Function GetPixelColor( _
   ByVal row As Integer, _
   ByVal column As Integer _
) As RasterColor

Visual Basic (Usage)	Copy Code
Dim instance As RasterImage Dim row As Integer Dim column As Integer Dim value As RasterColor   value = instance.GetPixelColor(row, column)

public RasterColor GetPixelColor( 
   int row,
   int column
)

public:
RasterColor GetPixelColor( 
   int row,
   int column
) 

Parameters

row

The zero-based row number of the pixel.

column

The zero-based column number of the pixel.

Return Value

This example uses GetPixelColor and SetPixelColor to invert the colors of the pixels in a line in the upper left part of the displayed image.

Visual Basic

Copy Code

Public Sub GetPixelColorExample()    RasterCodecs.Startup()    Dim codecs As RasterCodecs = New RasterCodecs()    ' Load the image    Dim image As RasterImage = codecs.Load(LeadtoolsExamples.Common.ImagesPath.Path + "IMAGE1.CMP")    ' Specify a line of pixels.    Dim Offset As Point = New Point(image.Width \ 8, image.Height \ 8)    Dim XSize As Integer = image.Width \ 3    ' Invert the colors of pixels in the line.    Dim i As Integer = 0    Do While i < XSize       Dim OldOffset As Point = New Point(Offset.X, Offset.Y)       ' Adjust the XOffset and YOffset in case the view perspective is not TopLeft.       Offset = image.PointToImage(RasterViewPerspective.TopLeft, Offset)       Dim PixelColor As RasterColor = image.GetPixelColor(Offset.Y, Offset.X)       PixelColor.R = CByte(255 - PixelColor.R)       PixelColor.G = CByte(255 - PixelColor.G)       PixelColor.B = CByte(255 - PixelColor.B)       image.SetPixelColor(Offset.Y, Offset.X, PixelColor)       Offset = OldOffset ' Restore Offset       Offset.X = Offset.X + 1       i += 1    Loop    codecs.Save(image, LeadtoolsExamples.Common.ImagesPath.Path + "IMAGE1_GetPixelColor.BMP", RasterImageFormat.Bmp, 0)    image.Dispose()    codecs.Dispose()    RasterCodecs.Shutdown() End Sub

C#

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public void GetPixelColorExample()  {     RasterCodecs.Startup();     RasterCodecs codecs = new RasterCodecs();     // Load the image     RasterImage image = codecs.Load(LeadtoolsExamples.Common.ImagesPath.Path + "IMAGE1.CMP");       // Specify a line of pixels.     Point Offset = new Point(image.Width / 8, image.Height / 8);     int XSize = image.Width / 3;       // Invert the colors of pixels in the line.     for(int i = 0; i < XSize; i++)     {        Point OldOffset = new Point(Offset.X, Offset.Y);        // Adjust the XOffset and YOffset  in case the view perspective is not TopLeft.        Offset = image.PointToImage(Leadtools.RasterViewPerspective.TopLeft, Offset);        RasterColor PixelColor = image.GetPixelColor(Offset.Y, Offset.X);        PixelColor.R = (byte)(255 - PixelColor.R);        PixelColor.G = (byte)(255 - PixelColor.G);        PixelColor.B = (byte)(255 - PixelColor.B);        image.SetPixelColor(Offset.Y, Offset.X, PixelColor);          Offset = OldOffset; // Restore Offset        Offset.X = Offset.X + 1;     }       codecs.Save(image, LeadtoolsExamples.Common.ImagesPath.Path + "IMAGE1_GetPixelColor.BMP", RasterImageFormat.Bmp, 0);       image.Dispose();     codecs.Dispose();     RasterCodecs.Shutdown();  }

The standard Windows values for RasterColor represent either red, green, and blue color values, or an index into the image palette. A RasterColor value with the RGB value of 0x00BBGGRR represents the blue, green, and red color values for the specified pixel, where 0xBB is the blue value, 0xGG is the green value and 0xRR is the red value. If 0x01000000 is set in the RGB value of RasterColor (0x010000ZZ), the lower 8 bits (0xZZ) represent an index into the image palette which holds the color value.

You can use the SetPixelColor method to assign the returned value to another pixel.

This method uses image coordinates to specify the pixel. Therefore, you must account for the view perspective of the image.

If you specify a pixel that is outside the image or outside the region (if the image has one), this method throws an exception.

This method does not support signed images.

For more information, refer to Introduction to Image Processing With LEADTOOLS.

For more information refer to Accounting for View Perspective.

Target Platforms: Microsoft .NET Framework 3.0, Windows XP, Windows Server 2003 family, Windows Server 2008 family

Reference