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InvertCommand Class
See Also  Members   Example 



Inverts the colors in the specified image, giving it the appearance of a photographic negative.

Syntax

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

Example

Run the InvertCommand on an image.

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

   Dim leadImage As RasterImage = codecs.Load(LeadtoolsExamples.Common.ImagesPath.Path + "Master.jpg")

   ' Prepare the command
   Dim command As InvertCommand = New InvertCommand
   'Invert the colors of the image.

   command.Run(leadImage)
   codecs.Save(leadImage, LeadtoolsExamples.Common.ImagesPath.Path + "Result.jpg", RasterImageFormat.Jpeg, 24)

   RasterCodecs.Shutdown()
End Sub
C#Copy Code
public void InvertCommandExample() 
{ 
   // Load an image 
   RasterCodecs.Startup(); 
   RasterCodecs codecs = new RasterCodecs(); 
   codecs.ThrowExceptionsOnInvalidImages = true; 
 
   RasterImage image = codecs.Load(LeadtoolsExamples.Common.ImagesPath.Path + "Master.jpg"); 
 
   // Prepare the command 
   InvertCommand command  = new InvertCommand(); 
   //Invert the colors of the image. 
   command.Run(image); 
   codecs.Save(image, LeadtoolsExamples.Common.ImagesPath.Path + "Result.jpg", RasterImageFormat.Jpeg, 24); 
 
   RasterCodecs.Shutdown(); 
}

Remarks

  • This class can also be used to invert the color of a 1-bit image, making the black white and the white black.
  • This class 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.
  • This command supports signed data images.

This command changes the image data. If the image has a LUT, the command will work on the LUT not the image data. If the image has a LUT and you want to work on the image data, first disable the use of the LUT by setting the UseLookupTable Property to FALSE. After you are finished applying the command, restore the use of the LUT by setting the UseLookupTable Property to TRUE again. See the following snippet:


image.UseLookupTable = FALSE;
InvertCmd.Run(image);
image.UseLookupTable = TRUE;
For more information, refer to Correcting Colors.

Inheritance Hierarchy

System.Object
   Leadtools.ImageProcessing.RasterCommand
      Leadtools.ImageProcessing.Color.InvertCommand

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