HalfToneCommand Class

Converts a 1-, 4-, 8-, 16-, 24-, or 32-bit image to a halftoned image, with a specified pattern rotation. A halftoned image is a 1-bit image that has been dithered for black and white printing or display.

Object Model

Syntax

Visual Basic
C#
WinRT C#
WinRT JavaScript
C++

public class HalfToneCommand : Leadtools.ImageProcessing.RasterCommand, Leadtools.ImageProcessing.IRasterCommand

'Declaration
 
Public Class HalfToneCommand 
   Inherits Leadtools.ImageProcessing.RasterCommand
   Implements Leadtools.ImageProcessing.IRasterCommand

'Usage
 
Dim instance As HalfToneCommand

public sealed class HalfToneCommand : Leadtools.ImageProcessing.IRasterCommand

function Leadtools.ImageProcessing.Core.HalfToneCommand()

public ref class HalfToneCommand : public Leadtools.ImageProcessing.RasterCommand, Leadtools.ImageProcessing.IRasterCommand

Remarks

For the HalfToneCommandType.UserDefined option, the number of images in the list must be at least equal to (Dimension * Dimension + 1). Images with higher indexes correspond to higher intensity values.
This command can process the whole image or a region of the image.
This command does not support 12 and 16-bit grayscale and 48 and 64-bit color images.
This command does not support signed data images.
This command supports 32-bit grayscale images.

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

Example

Visual Basic
C#
WinRT C#
WinRT JavaScript
Silverlight C#
Silverlight VB

Public Sub HalfToneCommandExample()
   Dim codecs As New RasterCodecs()
   codecs.ThrowExceptionsOnInvalidImages = True

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

   ' Prepare the command
   Try
      Dim command As HalfToneCommand = New HalfToneCommand
      command.Angle = 0
      command.Dimension = 2
      command.Type = HalfToneCommandType.View
      'Halftone the image.
      command.Run(leadImage)
   Catch ex As Exception
      MessageBox.Show(ex.Message, "HalfToneTest", MessageBoxButtons.OK, MessageBoxIcon.Exclamation)
   End Try

End Sub

Public NotInheritable Class LEAD_VARS
   Public Const ImagesDir As String = "C:\Users\Public\Documents\LEADTOOLS Images"
End Class

public void HalfToneCommandExample()
   {
      // Load an image
      RasterCodecs codecs = new RasterCodecs();
      codecs.ThrowExceptionsOnInvalidImages = true;

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

      // Prepare the command
      HalfToneCommand command = new HalfToneCommand();
      command.Angle = 0;
      command.Dimension = 2;
      command.Type = HalfToneCommandType.View;
      //Halftone the image.
      command.Run(image);

   }

static class LEAD_VARS
{
   public const string ImagesDir = @"C:\Users\Public\Documents\LEADTOOLS Images";
}

function HalfToneCommandExample()
{
   var codecs = new Leadtools.Codecs.RasterCodecs();
   codecs.throwExceptionsOnInvalidImages = true;

   // Load the image
   var srcFileName = "Assets\\Image1.cmp";
   return Tools.AppInstallFolder().getFileAsync(srcFileName).then(function (loadFile) {
      return codecs.loadAsync(Leadtools.LeadStreamFactory.create(loadFile));
   }).then(function (image) {
      // Prepare the command
      with (Leadtools.ImageProcessing.Core) {
         var command = new HalfToneCommand();
         command.angle = 0;
         command.dimension = 2;
         command.type = HalfToneCommandType.view;
         //Halftone the image.
         command.run(image);
      }
   });
}

[TestMethod]
public async Task HalfToneCommandExample()
{
   // Load an image
   RasterCodecs codecs = new RasterCodecs();
   codecs.ThrowExceptionsOnInvalidImages = true;
   // Load the image
   string srcFileName = @"Assets\Image1.cmp";
   StorageFile loadFile = await Tools.AppInstallFolder.GetFileAsync(srcFileName);
   RasterImage image = await codecs.LoadAsync(LeadStreamFactory.Create(loadFile));

   // Prepare the command
   HalfToneCommand command = new HalfToneCommand();
   command.Angle = 0;
   command.Dimension = 2;
   command.Type = HalfToneCommandType.View;
   //Halftone the image.
   command.Run(image);

}

Requirements

Target Platforms: Windows 7, Windows Vista SP1 or later, Windows XP SP3, Windows Server 2008 (Server Core not supported), Windows Server 2008 R2 (Server Core supported with SP1 or later), Windows Server 2003 SP2

Reference