RemapIntensityCommand Class

Summary

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

Syntax

Objective-C

C++/CLI

Java

Python

public class RemapIntensityCommand : RasterCommand

@interface LTRemapIntensityCommand : LTRasterCommand

public class RemapIntensityCommand 
    extends RasterCommand

public ref class RemapIntensityCommand : public RasterCommand

class RemapIntensityCommand(RasterCommand):

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 can be used to implement end user features such as Photoshop Curves.
This command supports signed data images.
This command does not support 32-bit grayscale images.

For more information, refer to Changing Brightness and Contrast.

Remap Intensity Function - Before

Remap Intensity Function - After

View additional platform support for this Remap Intensity function.

Example

Run the RemapIntensityCommand on an image.

Java

using Leadtools; 
using Leadtools.Codecs; 
using Leadtools.ImageProcessing; 
using Leadtools.ImageProcessing.Color; 
using Leadtools.ImageProcessing.Effects; 
 
 
public void RemapIntensityCommandExample() 
{ 
   // Load an image 
   RasterCodecs codecs = new RasterCodecs(); 
   codecs.ThrowExceptionsOnInvalidImages = true; 
 
   RasterImage image = codecs.Load(Path.Combine(LEAD_VARS.ImagesDir, "sample5.cmp")); 
 
   // 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:\LEADTOOLS23\Resources\Images"; 
}

 
import java.io.File; 
import java.io.IOException; 
 
import org.junit.*; 
import org.junit.runner.JUnitCore; 
import org.junit.runner.Result; 
import org.junit.runner.notification.Failure; 
import static org.junit.Assert.*; 
 
import leadtools.*; 
import leadtools.codecs.*; 
import leadtools.imageprocessing.color.*; 
import leadtools.imageprocessing.effects.*; 
 
 
public void remapIntensityCommandExample() { 
 
    final String LEAD_VARS_IMAGES_DIR = "C:\\LEADTOOLS23\\Resources\\Images"; 
    final String outputFileName = combine(LEAD_VARS_IMAGES_DIR, "Result.jpg"); 
 
    // Load an image 
    RasterCodecs codecs = new RasterCodecs(); 
    codecs.setThrowExceptionsOnInvalidImages(true); 
 
    RasterImage image = codecs.load(combine(LEAD_VARS_IMAGES_DIR, "sample5.cmp")); 
 
    // 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.setFlags(RemapIntensityCommandFlags.MASTER.getValue()); 
    command.setLookupTable(lookupTable); 
    command.run(image); 
    codecs.save(image, outputFileName, RasterImageFormat.JPEG, 24); 
 
    System.out.println("Command run and image saved to " + outputFileName); 
    assertTrue(new File(outputFileName).exists()); 
 
}