Leadtools.ImageProcessing.Effects Send comments on this topic. | Back to Introduction - All Topics | Help Version 16.5.9.25
ColorHalftoneCommand Class
See Also  Members   Example 
Leadtools.ImageProcessing.Effects Namespace : ColorHalftoneCommand Class



Shows the effect of using an enlarged halftone screen on each image channel. The filter divides the image into rectangles and replaces each rectangle with circles. Each channel has a separate grid of circles, and has its own angle setting. The size of each circle is proportional to the brightness of the rectangle that it is replacing. This method is available in the Document/Medical toolkits.

Syntax

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

Example

Run the ColorHalftoneCommand on an image.

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

   Dim leadImage As RasterImage = codecs.Load(LeadtoolsExamples.Common.ImagesPath.Path + "Beauty16.jpg", 16, CodecsLoadByteOrder.BgrOrGray, 1, 1)

   ' Prepare the command
   Dim command As New ColorHalftoneCommand
   command.MaximumRadius = 15
   command.CyanAngle = 10800
   command.MagentaAngle = 16200
   command.YellowAngle = 9000
   command.BlackAngle = 4500
   command.Run(leadImage)
   codecs.Save(leadImage, LeadtoolsExamples.Common.ImagesPath.Path + "Result.jpg", RasterImageFormat.Jpeg, 24)

   RasterCodecs.Shutdown()
End Sub
C#Copy Code
public void ColorHalftoneCommandExample() 
{ 
   // Load an image 
   RasterCodecs.Startup(); 
   RasterCodecs codecs = new RasterCodecs(); 
   codecs.ThrowExceptionsOnInvalidImages = true; 
 
   RasterImage image = codecs.Load(LeadtoolsExamples.Common.ImagesPath.Path + "Beauty16.jpg",16,CodecsLoadByteOrder.BgrOrGray,1,1); 
 
 
   // Prepare the command 
   ColorHalftoneCommand command  = new ColorHalftoneCommand(); 
   command.MaximumRadius = 15; 
   command.CyanAngle = 10800; 
   command.MagentaAngle = 16200; 
   command.YellowAngle = 9000; 
   command.BlackAngle = 4500; 
   command.Run(image); 
   codecs.Save(image, LeadtoolsExamples.Common.ImagesPath.Path + "Result.jpg", RasterImageFormat.Jpeg, 24); 
 
   RasterCodecs.Shutdown(); 
}

Remarks

  • This method 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.
  • If the image has a region, this method works only on the region. If the image does not have a region, this method works on the entire image.
  • This method does not support signed data images.
  • This command does not support 32-bit grayscale images.

Inheritance Hierarchy

System.Object
   Leadtools.ImageProcessing.RasterCommand
      Leadtools.ImageProcessing.Effects.ColorHalftoneCommand

Requirements

Target Platforms: Microsoft .NET Framework 2.0, Windows 98, Windows NT 4.0, Windows Millennium Edition, Windows 2000, Windows XP Home Edition, Windows XP Professional, Windows Server 2003 family

See Also