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HighPassCommand Class

Removes low frequency details in an image, resulting in a sharpened image.
public class HighPassCommand : RasterCommand 
Public Class HighPassCommand  
   Inherits RasterCommand 
@interface LTHighPassCommand : LTRasterCommand 
public class HighPassCommand extends RasterCommand 
public ref class HighPassCommand : public RasterCommand   
  • 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-bit and 16-bit grayscale and 48-bit and 64-bit color images. Support for 12-bit and 16-bit grayscale and 48-bit and 64-bit color images is available only in the Document/Medical toolkits.
  • This command does not support 32-bit grayscale images.

For more information, refer to Removing Noise.


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

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; 
   codecs.Save(image, Path.Combine(LEAD_VARS.ImagesDir, "Result.jpg"), RasterImageFormat.Jpeg, 24); 
static class LEAD_VARS 
   public const string ImagesDir = @"C:\LEADTOOLS21\Resources\Images"; 
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 
   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:\LEADTOOLS21\Resources\Images" 
End Class 

Target Platforms

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Leadtools.ImageProcessing.Effects Assembly