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Halftone Method

Summary

Converts a 1-bit, 4-bit, 8-bit, 16-bit, 24-bit, 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.

Syntax

C#
VB
C++
[FaultContractAttribute(System.Type)] 
[OperationContractAttribute(Action="Halftone", 
   AsyncPattern=false, 
   IsOneWay=false, 
   IsInitiating=true, 
   IsTerminating=false)] 
public CommandResponse Halftone( 
   HalftoneRequest request 
) 
  
<OperationContractAttribute("Halftone")> 
<FaultContractAttribute(DetailType=Leadtools.Services.Raster.FaultContracts.RasterFault,  
   Action="",  
   Name="",  
   Namespace="",  
   ProtectionLevel=ProtectionLevel.None,  
   HasProtectionLevel=False)> 
Function Halftone( _ 
   ByVal request As Leadtools.Services.Imageprocessing.Datacontracts.HalftoneRequest _ 
) As Leadtools.Services.Imageprocessing.Datacontracts.CommandResponse 
[OperationContractAttribute("Halftone")] 
[FaultContractAttribute(DetailType=Leadtools.Services.Raster.FaultContracts.RasterFault,  
   Action="",  
   Name="",  
   Namespace="",  
   ProtectionLevel=ProtectionLevel.None,  
   HasProtectionLevel=false)] 
Leadtools.Services.Imageprocessing.Datacontracts.CommandResponse^ Halftone(  
   Leadtools.Services.Imageprocessing.Datacontracts.HalftoneRequest^ request 
)  

Parameters

request
A System.Runtime.Serialization.DataContractAttribute containing the data that will be used in this Halftone operation.

Return Value

A System.Runtime.Serialization.DataContractAttribute containing the modified image resulting from the Halftone operation.

Remarks
  • For the Leadtools.Services.ImageProcessing.DataContracts.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.
Example

C#
VB
using Leadtools.Services; 
 
public void HalftoneExample() 
{ 
   ColorProcessingServiceClient client = new ColorProcessingServiceClient(); 
 
   RawBinaryData sourceBinaryData = new RawBinaryData(); 
   sourceBinaryData.Data = File.ReadAllBytes(Path.Combine(LEAD_VARS.ImagesDir, "image1.cmp")); 
 
   RasterConvertOptions convertOptions = new RasterConvertOptions(); 
 
   convertOptions.Source = sourceBinaryData; 
   convertOptions.Destination = null; 
   convertOptions.Format = RasterImageFormat.Bmp; 
   convertOptions.FirstPage = 1; 
   convertOptions.LastPage = 1; 
   convertOptions.BitsPerPixel = 24; 
   convertOptions.QualityFactor = 2; 
 
   HalftoneRequest request = new HalftoneRequest(); 
 
   request.ConvertOptions = convertOptions; 
   request.RegionData = null; 
   request.Angle = 0; 
   request.Dimension = 2; 
   request.Type = HalftoneCommandType.View; 
 
   CommandResponse response = client.Halftone(request); 
   if (response.Destination != null) 
   { 
      if (response.Destination is RawBinaryData) 
         File.WriteAllBytes(Path.Combine(LEAD_VARS.ImagesDir, "Halftone.bmp"), (response.Destination as RawBinaryData).Data); 
   } 
 
   client.Close(); 
} 
 
static class LEAD_VARS 
{ 
   public const string ImagesDir = @"C:\Users\Public\Documents\LEADTOOLS Images"; 
} 
Imports Leadtools.Services 
Imports Leadtools.Services.datacontracts._2009._01 
Imports Leadtools.Services.raster.datacontracts._2009._01 
Imports Leadtools.Services.ImageProcessing.datacontracts._2009._01 
 
Public Sub HalftoneExample() 
   Dim client As ColorProcessingServiceClient = New ColorProcessingServiceClient() 
 
   Dim sourceBinaryData As RawBinaryData = New RawBinaryData() 
   sourceBinaryData.Data = File.ReadAllBytes(Path.Combine(LEAD_VARS.ImagesDir, "image1.cmp")) 
 
   Dim convertOptions As RasterConvertOptions = New RasterConvertOptions() 
 
   convertOptions.Source = sourceBinaryData 
   convertOptions.Destination = Nothing 
   convertOptions.Format = RasterImageFormat.Bmp 
   convertOptions.FirstPage = 1 
   convertOptions.LastPage = 1 
   convertOptions.BitsPerPixel = 24 
   convertOptions.QualityFactor = 2 
 
   Dim request As HalftoneRequest = New HalftoneRequest() 
 
   request.ConvertOptions = convertOptions 
   request.RegionData = Nothing 
   request.Angle = 0 
   request.Dimension = 2 
   request.Type = HalftoneCommandType.View 
 
   Dim response As CommandResponse = client.Halftone(request) 
   If Not response.Destination Is Nothing Then 
      If TypeOf response.Destination Is RawBinaryData Then 
         File.WriteAllBytes(Path.Combine(LEAD_VARS.ImagesDir, "Halftone.bmp"), (TryCast(response.Destination, RawBinaryData)).Data) 
      End If 
   End If 
 
   client.Close() 
End Sub 
 
Public NotInheritable Class LEAD_VARS 
   Public Const ImagesDir As String = "C:\Users\Public\Documents\LEADTOOLS Images" 
End Class 

Requirements

Target Platforms

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