LookupTable Property

Summary

Gets or sets an optional lookup table that can be used to implement a user defined conversion.

Syntax

Objective-C

C++/CLI

Java

Python

public RasterColor[] LookupTable { get; set; }

@property (nonatomic, strong) NSMutableArray<LTRasterColor *> *lookupTable;

public RasterColor[ getLookupTable(); 
public void setLookupTable( 
   RasterColor[] rasterColor[ 
);

public: 
property array<RasterColor>^ LookupTable { 
   array<RasterColor>^ get(); 
   void set (    array<RasterColor>^ ); 
}

LookupTable # get and set (WindowLevelCommand)

Property Value

Optional lookup table that can be used to implement a user defined conversion. For every intensity value between 0 and 2 raised to the power of (HighBit - LowBit + 1) - 1 there should be a corresponding entry in the lookup table that contains an RGB quad. If LookupTable is null, the conversion is a normal shift (right or left) and the output image is 8-bit grayscale. If LookupTable is not null, the output image is a 24-bit image.

Example

Java

using Leadtools; 
using Leadtools.Codecs; 
using Leadtools.ImageProcessing; 
using Leadtools.ImageProcessing.Core; 
 
public void WindowLevelCommandExample() 
{ 
   // Load an image 
   RasterCodecs codecs = new RasterCodecs(); 
   codecs.ThrowExceptionsOnInvalidImages = true; 
 
   RasterImage image = codecs.Load(Path.Combine(LEAD_VARS.ImagesDir, "IMAGE3.dcm")); 
 
   // Prepare the command 
   int x; 
   byte y; 
   int Size; 
   RasterColor[] LookupTable; 
 
   //Change the image to 16-bit grayscale 
   GrayscaleCommand graycommand = new GrayscaleCommand(16); 
   MinMaxBitsCommand MinMaxBits = new MinMaxBitsCommand(); 
   MinMaxValuesCommand MinMaxValues = new MinMaxValuesCommand(); 
   WindowLevelCommand command = new WindowLevelCommand(); 
 
   graycommand.Run(image); 
   MinMaxBits.Run(image); 
   MinMaxValues.Run(image); 
 
   Size = (1 << (MinMaxBits.MaximumBit - MinMaxBits.MinimumBit + 1)); 
   LookupTable = new Leadtools.RasterColor[Size]; 
 
   // fill the first half of the LookupTable with RED. 
   for (x = 0; x < Size / 2; x++) 
      LookupTable[x] = new Leadtools.RasterColor(255, 0, 0); 
 
   // fill the rest with gray values. 
   for (x = Size / 2; x < Size; x++) 
   { 
      y = (byte)((x - MinMaxValues.MinimumValue) * 255 / (MinMaxValues.MaximumValue - MinMaxValues.MinimumValue)); 
      LookupTable[x] = new Leadtools.RasterColor(y, y, y); 
   } 
 
   command.HighBit = MinMaxBits.MaximumBit; 
   command.LowBit = MinMaxBits.MinimumBit; 
   command.LookupTable = LookupTable; 
   command.Order = Leadtools.RasterByteOrder.Bgr; 
 
   command.Run(image); 
 
} 
 
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.*; 
import leadtools.imageprocessing.core.*; 
 
 
public void windowLevelCommandExample() { 
   final String LEAD_VARS_IMAGES_DIR = "C:\\LEADTOOLS23\\Resources\\Images"; 
 
   // Load an image 
   RasterCodecs codecs = new RasterCodecs(); 
   codecs.setThrowExceptionsOnInvalidImages(true); 
 
   RasterImage image = codecs.load(combine(LEAD_VARS_IMAGES_DIR, "DICOM\\IMAGE3.dcm")); 
 
   // Prepare the command 
   int x; 
   byte y; 
   int size; 
   RasterColor[] lookupTable; 
 
   // Change the image to 16-bit grayscale 
   GrayscaleCommand grayCommand = new GrayscaleCommand(16); 
   MinMaxBitsCommand minMaxBits = new MinMaxBitsCommand(); 
   MinMaxValuesCommand minMaxValues = new MinMaxValuesCommand(); 
   WindowLevelCommand command = new WindowLevelCommand(); 
 
   grayCommand.run(image); 
   minMaxBits.run(image); 
   minMaxValues.run(image); 
 
   size = (1 << (minMaxBits.getMaximumBit() - minMaxBits.getMinimumBit() + 1)); 
   lookupTable = new leadtools.RasterColor[size]; 
 
   // fill the first half of the LookupTable with RED. 
   for (x = 0; x < size / 2; x++) 
      lookupTable[x] = new leadtools.RasterColor(255, 0, 0); 
 
   // fill the rest with gray values. 
   for (x = size / 2; x < size; x++) { 
      y = (byte) ((x - minMaxValues.getMinimumValue()) * 255 
            / (minMaxValues.getMaximumValue() - minMaxValues.getMinimumValue())); 
      lookupTable[x] = new leadtools.RasterColor(y, y, y); 
   } 
 
   command.setHighBit(minMaxBits.getMaximumBit()); 
   command.setLowBit(minMaxBits.getMinimumBit()); 
   command.setLookupTable(lookupTable); 
   command.setOrder(RasterByteOrder.BGR); 
 
   int change = command.run(image); 
   assertTrue(change != RasterImageChangedFlags.NONE); 
 
   codecs.save(image, combine(LEAD_VARS_IMAGES_DIR, "Result.jpg"), RasterImageFormat.JPEG, 24); 
   System.out.println("Command run, image saved to " + combine(LEAD_VARS_IMAGES_DIR, "Result.jpg")); 
}

Requirements

Target Platforms

Reference

WindowLevelCommand Class

WindowLevelCommand Members

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Help Version 23.0.2024.3.3

Leadtools.ImageProcessing.Core Assembly

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