RemapIntensityCommand Class

Uses a lookup table to change an image's intensity values. You can apply the change to red, green, blue, or all color channels.

Object Model

Syntax

Visual Basic
C#
WinRT C#
WinRT JavaScript
C++

public class RemapIntensityCommand : Leadtools.ImageProcessing.RasterCommand, Leadtools.ImageProcessing.IRasterCommand

'Declaration
 
Public Class RemapIntensityCommand 
   Inherits Leadtools.ImageProcessing.RasterCommand
   Implements Leadtools.ImageProcessing.IRasterCommand

'Usage
 
Dim instance As RemapIntensityCommand

public sealed class RemapIntensityCommand : Leadtools.ImageProcessing.IRasterCommand

function Leadtools.ImageProcessing.Color.RemapIntensityCommand()

public ref class RemapIntensityCommand : public Leadtools.ImageProcessing.RasterCommand, Leadtools.ImageProcessing.IRasterCommand

Remarks

The current intensity values correspond to the table indexes. The values of the entries are the new values to be applied.
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.
The image intensity level range depends on the resolution of the image. For 64-bit, 48-bit, and 16-bit images, the intensity levels range from 0 to 2^16-1. For 12-bit images, the intensity levels range from 0 to 2^12-1. For other resolutions, the intensity levels range from 0 to 255.
Be sure that LookupTable property contains the number of the image intensity levels. For example if the image is 16-bit (the maximum image intensity level is 2^16 - 1).
This command supports signed data images.
This command does not support 32-bit grayscale images.

For more information, refer to Changing Brightness and Contrast.

Example

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

Public Sub RemapIntensityCommandExample()
   Dim codecs As New RasterCodecs()
   codecs.ThrowExceptionsOnInvalidImages = True

   Dim leadImage As RasterImage = codecs.Load(Path.Combine(LEAD_VARS.ImagesDir, "Master.jpg"))

   ' Prepare the command
   'This example will darken loaded image by using lookup table affected by exponential function.
   Dim LookupTable() As Integer ' Array to hold lookup table.
   ReDim LookupTable(255)

   'Get Lookup table where the array calculated by the linear function for all the items of the array is from 0 - 255.
   LookupTable(0) = 255
   LookupTable(255) = 0

   EffectsUtilities.GetFunctionalLookupTable(LookupTable, 0, 255, 5, FunctionalLookupTableFlags.Linear)

   Dim command As RemapIntensityCommand = New RemapIntensityCommand
   command.Flags = RemapIntensityCommandFlags.Master
   command.LookupTable = LookupTable

   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

public void RemapIntensityCommandExample()
   {
      // Load an image
      RasterCodecs codecs = new RasterCodecs();
      codecs.ThrowExceptionsOnInvalidImages = true;

      RasterImage image = codecs.Load(Path.Combine(LEAD_VARS.ImagesDir, "Master.jpg"));

      // Prepare the command
      //This example will darken loaded image by using lookup table affected by exponential function.
      int[] LookupTable = new int[256]; // Array to hold lookup table.

      //Get Lookup table where the array calculated by the linear function for all the items of the array is from 0 - 255.
      LookupTable[0] = 255;
      LookupTable[255] = 0; 

      EffectsUtilities.GetFunctionalLookupTable(LookupTable, 0, 255, 5, FunctionalLookupTableFlags.Linear);

      RemapIntensityCommand command = new RemapIntensityCommand();
      command.Flags = RemapIntensityCommandFlags.Master;
      command.LookupTable = LookupTable;
      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";
}

[TestMethod]
public async Task RemapIntensityCommandExample()
{
   // 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
   //This example will darken loaded image by using lookup table affected by exponential function.
   int[] LookupTable = new int[256]; // Array that contains the initialized lookup table.

   //Get Lookup table where the array calculated by the linear function for all the items of the array is from 0 - 255.
   LookupTable[0] = 255;
   LookupTable[255] = 0;

   int[] retLookupTable = EffectsUtilities.GetFunctionalLookupTable(LookupTable, 0, 255, 5, FunctionalLookupTableFlags.Linear);

   RemapIntensityCommand command = new RemapIntensityCommand();
   command.Flags = RemapIntensityCommandFlags.Master;
   command.LookupTable = retLookupTable;
   command.Run(image);

   string destFileName = @"result.jpg";
   StorageFile saveFile = await Tools.AppLocalFolder.CreateFileAsync(destFileName);
   await codecs.SaveAsync(image, LeadStreamFactory.Create(saveFile), RasterImageFormat.Jpeg, 0);
}

public void RemapIntensityCommandExample(RasterImage image, Stream outStream)
{
   // Prepare the command
   //This example will darken loaded image by using lookup table affected by exponential function.
   int[] LookupTable = new int[256]; // Array to hold lookup table.
   //Get Lookup table where the array calculated by the linear function for all the items of the array is from 0 - 255.
   LookupTable[0] = 255;
   LookupTable[255] = 0;

   EffectsUtilities.GetFunctionalLookupTable(LookupTable, 0, 255, 5, FunctionalLookupTableFlags.Linear);
   RemapIntensityCommand command = new RemapIntensityCommand();
   command.Flags = RemapIntensityCommandFlags.Master;
   command.LookupTable = LookupTable;
   command.Run(image);

   // Save result image
   RasterCodecs codecs = new RasterCodecs();
   codecs.Save(image, outStream, RasterImageFormat.Jpeg, 24);
   image.Dispose();
}

Public Sub RemapIntensityCommandExample(ByVal image As RasterImage, ByVal outStream As Stream)
   ' Prepare the command
   'This example will darken loaded image by using lookup table affected by exponential function.
   Dim LookupTable As Integer() = New Integer(255){} ' Array to hold lookup table.
   'Get Lookup table where the array calculated by the linear function for all the items of the array is from 0 - 255.
   LookupTable(0) = 255
   LookupTable(255) = 0

   EffectsUtilities.GetFunctionalLookupTable(LookupTable, 0, 255, 5, FunctionalLookupTableFlags.Linear)
   Dim command As RemapIntensityCommand = New RemapIntensityCommand()
   command.Flags = RemapIntensityCommandFlags.Master
   command.LookupTable = LookupTable
   command.Run(image)

   ' Save result image
   Dim codecs As RasterCodecs = New RasterCodecs()
   codecs.Save(image, outStream, RasterImageFormat.Jpeg, 24)
   image.Dispose()
End Sub

Requirements

Target Platforms: Windows 7, Windows Vista SP1 or later, Windows XP SP3, Windows Server 2008 (Server Core not supported), Windows Server 2008 R2 (Server Core supported with SP1 or later), Windows Server 2003 SP2

Reference