ColorHalftoneCommand Class

Summary

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

Objective-C

C++

Java

public class ColorHalftoneCommand : RasterCommand

Public Class ColorHalftoneCommand  
   Inherits RasterCommand

@interface LTColorHalftoneCommand : LTRasterCommand

public class ColorHalftoneCommand extends RasterCommand

public ref class ColorHalftoneCommand : public RasterCommand

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.

Example

Run the ColorHalftoneCommand on an image.

using Leadtools; 
using Leadtools.Codecs; 
using Leadtools.ImageProcessing.Effects; 
 
public void ColorHalftoneCommandExample() 
{ 
   // Load an image 
   RasterCodecs codecs = new RasterCodecs(); 
   codecs.ThrowExceptionsOnInvalidImages = true; 
 
   RasterImage image = codecs.Load(Path.Combine(LEAD_VARS.ImagesDir, @"ImageProcessingDemo\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, Path.Combine(LEAD_VARS.ImagesDir, "Result.jpg"), RasterImageFormat.Jpeg, 24); 
 
} 
 
static class LEAD_VARS 
{ 
   public const string ImagesDir = @"C:\Users\Public\Documents\LEADTOOLS Images"; 
}

Imports Leadtools 
Imports Leadtools.Codecs 
Imports Leadtools.ImageProcessing.Effects 
 
Public Sub ColorHalftoneCommandExample() 
   Dim codecs As New RasterCodecs() 
   codecs.ThrowExceptionsOnInvalidImages = True 
 
   Dim leadImage As RasterImage = codecs.Load(Path.Combine(LEAD_VARS.ImagesDir, "ImageProcessingDemo\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, 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#[Silverlight C# Example] 
using Leadtools; 
using Leadtools.Codecs; 
using Leadtools.ImageProcessing.Effects; 
using Leadtools.Examples; 
 
public void ColorHalftoneCommandExample(RasterImage image, Stream outStream) 
{ 
   // 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); 
   // Save result image 
   RasterCodecs codecs = new RasterCodecs(); 
   codecs.Save(image, outStream, RasterImageFormat.Jpeg, 24); 
   image.Dispose(); 
} 
vb[Silverlight VB Example] 
Imports Leadtools 
Imports Leadtools.Codecs 
Imports Leadtools.ImageProcessing.Effects 
 
Public Sub ColorHalftoneCommandExample(ByVal image As RasterImage, ByVal outStream As Stream) 
   ' Prepare the command 
   Dim command As ColorHalftoneCommand = New ColorHalftoneCommand() 
   command.MaximumRadius = 15 
   command.CyanAngle = 10800 
   command.MagentaAngle = 16200 
   command.YellowAngle = 9000 
   command.BlackAngle = 4500 
   command.Run(image) 
   ' Save result image 
   Dim codecs As RasterCodecs = New RasterCodecs() 
   codecs.Save(image, outStream, RasterImageFormat.Jpeg, 24) 
   image.Dispose() 
End Sub