HighPassCommand Class

• This command removes low-frequency detail in the image. The method is opposite to that of the Gaussian Blur method
• To increase the thickness of the edges, increase the value of radius. Usually a low value for radius is better.
• Unlike the UnsharpMaskCommand, when using this command, the low frequency features are removed from the image.
• As an example, if you use the following image:
  
  And you were to call HighPassCommand using the following settings:
  

  Parameter	Value
  Radius	6
  Opacity	100

  
  The following figure results:
  
• If the image has a region, the command will be applied on the region only.
• This command 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 32-bit grayscale images.

Run the HighPassCommand on an image and applies the HighPass filter.

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

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Imports Leadtools
Imports Leadtools.Codecs
Imports Leadtools.ImageProcessing.Effects

   
Public Sub HighPassCommandExample()
   Dim codecs As New RasterCodecs()
   codecs.ThrowExceptionsOnInvalidImages = True
   Dim leadImage As RasterImage = codecs.Load(Path.Combine(LEAD_VARS.ImagesDir, "sample5.cmp"))

   ' Prepare the command
   Dim command As HighPassCommand = New HighPassCommand
   command.Radius = 6
   command.Opacity = 100
   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

using Leadtools;
using Leadtools.Codecs;
using Leadtools.ImageProcessing.Effects;

      
public void HighPassCommandExample()
{
   // Load an image
   RasterCodecs codecs = new RasterCodecs();
   codecs.ThrowExceptionsOnInvalidImages = true;
   RasterImage image = codecs.Load(Path.Combine(LEAD_VARS.ImagesDir, "sample5.cmp"));

   // Prepare the command
   HighPassCommand command = new HighPassCommand () ;
   command.Radius = 6 ;
   command.Opacity = 100 ;
   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";
}

using Leadtools;
using Leadtools.Codecs;
using Leadtools.ImageProcessing.Effects;
using Leadtools.ImageProcessing;

      
public async Task HighPassCommandExample()
{
   // 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
   HighPassCommand command = new HighPassCommand () ;
   command.Radius = 6 ;
   command.Opacity = 100 ;
   command.Run(image);
   //Save as BMP
   string destFileName = @"result.bmp";
   StorageFile saveFile = await Tools.AppLocalFolder.CreateFileAsync(destFileName);
   await codecs.SaveAsync(image, LeadStreamFactory.Create(saveFile), RasterImageFormat.Bmp, 24);

}

using Leadtools;
using Leadtools.Codecs;
using Leadtools.ImageProcessing.Effects;
using Leadtools.Examples;

public void HighPassCommandExample(RasterImage image, Stream outStream)
{
   // Prepare the command
   HighPassCommand command = new HighPassCommand();
   command.Radius = 6;
   command.Opacity = 100;
   command.Run(image);
   // Save result image
   RasterCodecs codecs = new RasterCodecs();
   codecs.Save(image, outStream, RasterImageFormat.Jpeg, 24);
   image.Dispose();
}

Imports Leadtools
Imports Leadtools.Codecs
Imports Leadtools.ImageProcessing.Effects

Public Sub HighPassCommandExample(ByVal image As RasterImage, ByVal outStream As Stream)
   ' Prepare the command
   Dim command As HighPassCommand = New HighPassCommand()
   command.Radius = 6
   command.Opacity = 100
   command.Run(image)
   ' Save result image
   Dim codecs As RasterCodecs = New RasterCodecs()
   codecs.Save(image, outStream, RasterImageFormat.Jpeg, 24)
   image.Dispose()
End Sub

Target Platforms

Reference

HighPassCommand Members
Leadtools.ImageProcessing.Effects Namespace
Removing Noise
SharpenCommand Class
Leadtools.ImageProcessing.Color.PosterizeCommand
MosaicCommand Class
EmbossCommand Class
Leadtools.ImageProcessing.Core.MedianCommand
AddNoiseCommand Class
Leadtools.ImageProcessing.Color.IntensityDetectCommand
SpatialFilterCommand Class
BinaryFilterCommand Class
Leadtools.ImageProcessing.Color.SolarizeCommand
Leadtools.ImageProcessing.Core.WindowLevelCommand
UnsharpMaskCommand Class
GaussianCommand Class