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WindowLevelExtCommand Class

Converts a 12 or 16-bit grayscale image to a 16-bit grayscale or a 48-bit RGB image. This class is available in Document/Medical toolkits only.
public class WindowLevelExtCommand : RasterCommand 
@interface LTWindowLevelExtCommand : LTRasterCommand 
public class WindowLevelExtCommand 
    extends RasterCommand 
public ref class WindowLevelExtCommand : public RasterCommand   
class WindowLevelExtCommand(RasterCommand): 
  • This command supports 12 and 16-bit grayscale. Support for 12 and 16-bit grayscale images is available only in the Document/Medical toolkits.
  • This command does not support 32-bit grayscale images.
  • RasterByteOrder.Gray is not supported by this command.

Only TIFF and DICOM file formats are capable of saving images that have been window-leveled. Images can be window-leveled by calling WindowLevelExtCommand and specifying RasterWindowLevelMode.PaintAndProcessing for the flags parameter, by using the WindowLevelExtCommand or by loading an image from a file format that supports Window Leveling. If a window-leveled image is saved as any other file format, the image data will be converted before being saved. For more information, refer to Saving Window-Leveled Images. See WindowLevelCommand for a version of this class using 8-bit lookup tables. LEADTOOLS supports two types of LUTs for 10-16-bit grayscale images (8-bit LUT and 16-bit LUT). Typical grayscale image display and processing is done using an 8-bit LUT. But, you can also use a 16-bit LUT, which offers more precision. Some special video cards and monitors also support display of grayscale images using a 16-bit LUT. For more information, refer to Introduction to Image Processing With LEADTOOLS. For more information, refer to Grayscale Images.


Run the WindowLevelExtCommand on an image.

using Leadtools; 
using Leadtools.Codecs; 
using Leadtools.ImageProcessing; 
using Leadtools.ImageProcessing.Core; 
public void WindowLevelExtCommandExample() 
   // 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; 
   int y; 
   int Size; 
   RasterColor16[] LookupTable; 
   MinMaxBitsCommand MinMaxBits = new MinMaxBitsCommand(); 
   MinMaxValuesCommand MinMaxValues = new MinMaxValuesCommand(); 
   WindowLevelExtCommand command = new WindowLevelExtCommand(); 
   Size = (1 << (MinMaxBits.MaximumBit - MinMaxBits.MinimumBit + 1)); 
   LookupTable = new Leadtools.RasterColor16[Size]; 
   // fill the first half of the LookupTable with RED. 
   for (x = 0; x < Size / 2; x++) 
      LookupTable[x] = new Leadtools.RasterColor16(Leadtools.RasterColor16.MaximumComponent, 0, 0); 
   // fill the rest with gray values. 
   for (x = Size / 2; x < Size; x++) 
      y = (int)((x - MinMaxValues.MinimumValue) * Leadtools.RasterColor16.MaximumComponent / (MinMaxValues.MaximumValue - MinMaxValues.MinimumValue)); 
      LookupTable[x] = new Leadtools.RasterColor16(y, y, y); 
   command.HighBit = MinMaxBits.MaximumBit; 
   command.LowBit = MinMaxBits.MinimumBit; 
   command.LookupTable = LookupTable; 
   command.Order = Leadtools.RasterByteOrder.Bgr; 
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.Test; 
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.core.*; 
public void windowLevelExtCommandExample() { 
    final String LEAD_VARS_IMAGES_DIR = "C:\\LEADTOOLS23\\Resources\\Images"; 
    // Load an image 
    RasterCodecs codecs = new RasterCodecs(); 
    RasterImage image = codecs.load(combine(LEAD_VARS_IMAGES_DIR, "beauty16.jpg")); 
    // Prepare the command 
    int x; 
    int y; 
    int size; 
    RasterColor16[] lookupTable; 
    MinMaxBitsCommand minMaxBits = new MinMaxBitsCommand(); 
    MinMaxValuesCommand minMaxValues = new MinMaxValuesCommand(); 
    WindowLevelExtCommand command = new WindowLevelExtCommand(); 
    size = (1 << (minMaxBits.getMaximumBit() - minMaxBits.getMinimumBit() + 1)); 
    lookupTable = new RasterColor16[size]; 
    // fill the first half of the LookupTable with RED 
    for (x = 0; x < size / 2; x++) { 
        lookupTable[x] = new RasterColor16(RasterColor16.MAXIMUM_COMPONENT, 0, 0); 
    // fill the rest with gray values 
    for (x = size / 2; x < size; x++) { 
        y = (int) (x - minMaxValues.getMinimumValue()) * RasterColor16.MAXIMUM_COMPONENT 
                / (minMaxValues.getMaximumValue() - minMaxValues.getMinimumValue()); 
        lookupTable[x] = new RasterColor16(y, y, y); 
    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 and image saved to: " + combine(LEAD_VARS_IMAGES_DIR, "Result.jpg")); 

Target Platforms

Help Version 23.0.2024.3.3
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Leadtools.ImageProcessing.Core Assembly

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© 1991-2023 LEAD Technologies, Inc. All Rights Reserved.