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GrayScaleExtendedCommand Class
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Converts any image to a gray scale image without changing its resolution. Supported in Silverlight, Windows Phone 7

Object Model

GrayScaleExtendedCommand Class

Syntax

Visual Basic (Declaration) 
Public Class GrayScaleExtendedCommand 
   Inherits Leadtools.ImageProcessing.RasterCommand
   Implements IRasterCommand 
Visual Basic (Usage)Copy Code
Dim instance As GrayScaleExtendedCommand
C# 
public class GrayScaleExtendedCommand : Leadtools.ImageProcessing.RasterCommand, IRasterCommand 
C++/CLI 
public ref class GrayScaleExtendedCommand : public Leadtools.ImageProcessing.RasterCommand, IRasterCommand 

Example

Run the Leadtools.ImageProcessing.Color.GrayScaleExtendedCommand on an image with RedFactor = 300, GreenFactor = 590, and BlueFactor = 110.

Visual BasicCopy Code
Public Sub GrayScaleExtendedCommandExample()
   Dim codecs As New RasterCodecs()
   codecs.ThrowExceptionsOnInvalidImages = True

   Dim leadImage As RasterImage = codecs.Load(Path.Combine(LEAD_VARS.ImagesDir, "Master.jpg"))

   ' Prepare the command
   Dim command As GrayScaleExtendedCommand = New GrayScaleExtendedCommand
   command.RedFactor = 300
   command.GreenFactor = 590
   command.BlueFactor = 110
   command.Run(leadImage)
   codecs.Save(leadImage, Path.Combine(LEAD_VARS.ImagesDir, "Result.jpg"), RasterImageFormat.Jpeg, 24)

End Sub

Public NotInheritable Class LEAD_VARS
   Public Const ImagesDir As String = "C:\Users\Public\Documents\LEADTOOLS Images"
End Class
C#Copy Code
public void GrayScaleExtendedCommandExample()
   {
      // Load an image
      RasterCodecs codecs = new RasterCodecs();
      codecs.ThrowExceptionsOnInvalidImages = true;

      RasterImage image = codecs.Load(Path.Combine(LEAD_VARS.ImagesDir, "Master.jpg"));

      // Prepare the command
      GrayScaleExtendedCommand command = new GrayScaleExtendedCommand();
      command.RedFactor   = 300;
      command.GreenFactor = 590;
      command.BlueFactor  = 110;
      command.Run(image);
      codecs.Save(image, Path.Combine(LEAD_VARS.ImagesDir, "Result.jpg"), RasterImageFormat.Jpeg, 24);

   }

static class LEAD_VARS
{
   public const string ImagesDir = @"C:\Users\Public\Documents\LEADTOOLS Images";
}
SilverlightCSharpCopy Code
public void GrayScaleExtendedCommandExample(RasterImage image, Stream outStream)
{
   // Prepare the command
   GrayScaleExtendedCommand command = new GrayScaleExtendedCommand();
   command.RedFactor   = 300;
   command.GreenFactor = 590;
   command.BlueFactor  = 110;
   command.Run(image);
   // Save result image
   RasterCodecs codecs = new RasterCodecs();
   codecs.Save(image, outStream, RasterImageFormat.Jpeg, 24);
   image.Dispose();
}
SilverlightVBCopy Code
Public Sub GrayScaleExtendedCommandExample(ByVal image As RasterImage, ByVal outStream As Stream)
   ' Prepare the command
   Dim command As GrayScaleExtendedCommand = New GrayScaleExtendedCommand()
   command.RedFactor = 300
   command.GreenFactor = 590
   command.BlueFactor = 110
   command.Run(image)
   ' Save result image
   Dim codecs As RasterCodecs = New RasterCodecs()
   codecs.Save(image, outStream, RasterImageFormat.Jpeg, 24)
   image.Dispose()
End Sub

Remarks

  • RedFactor + GreenFactor + BlueFactor must equal 1000. (Internally the values are divided by 1000).

  • For each pixel in the image the red, green and blue values are modified by the RedFactor, GreenFactor and BlueFactor properties, respectively. This allows the user to give more weight to one color, essentially enhancing that color, before the pixel is converted to grayscale.
  • For example, if an object of this class has the RedFactor set to 500, the GreenFactor set to 250 and the BlueFactor set to 250, the red value of each pixel will get 50 percent of the weight when determining the grayscale value. The green value will get 25 percent of the weight and the blue value will get 25 percent of the weight when determining the grayscale value. This highlights or enhances the red in the image, prior to conversion to grayscale.
  • This class supports 12 and 16-bit grayscale and 48 and 64-bit color images. Support for 12 and 16-bit grayscale and 48 and 64-bit color images is available only in the Document/Medical toolkits.
  • This command does not support signed images.
For more information, refer to Grayscale Images.

Inheritance Hierarchy

System.Object
   Leadtools.ImageProcessing.RasterCommand
      Leadtools.ImageProcessing.Color.GrayScaleExtendedCommand

Requirements

Target Platforms: Silverlight, Windows XP, Windows Server 2003 family, Windows Server 2008 family, Windows Vista, Windows 7, MAC OS/X (Intel Only)

See Also