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WindowLevelCommand Class

Summary

Converts a 12 or 16-bit grayscale image to an 8-bit grayscale or a 24-bit RGB image. This class is available in Medical toolkits only.

Syntax

Java

Objective-C

WinRT C#

C++

public class WindowLevelCommand : RasterCommand

Public Class WindowLevelCommand  
   Inherits Leadtools.Imageprocessing.Leadtools.ImageProcessing.RasterCommand 
   Implements Leadtools.Imageprocessing.Leadtools.ImageProcessing.IRasterCommand

public sealed class WindowLevelCommand : Leadtools.Imageprocessing.Leadtools.ImageProcessing.IRasterCommand

@interface LTWindowLevelCommand : LTRasterCommand

public class WindowLevelCommand extends RasterCommand

function Leadtools.ImageProcessing.Core.WindowLevelCommand()

public ref class WindowLevelCommand : public Leadtools.Imageprocessing.Leadtools.ImageProcessing.RasterCommand, Leadtools.Imageprocessing.Leadtools.ImageProcessing.IRasterCommand

Remarks

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.Romm and RasterByteOrder.Gray are 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 WindowLevel and specifying RasterWindowLevelMode.PaintAndProcessing for the flags parameter, by using the WindowLevelCommand 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 WindowLevelExtCommand for a version of this class using 16-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. In Silverlight versions of LEADTOOLS, this image processing command will fail if the image data for the RasterImage object is stored internally using a Silverlight WriteableBitmap object. For more information, refer to Image Processing Command Limitations in Silverlight.

Example

Silverlight C#

Silverlight VB

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:\Users\Public\Documents\LEADTOOLS Images"; 
}

Imports Leadtools 
Imports Leadtools.Codecs 
Imports Leadtools.ImageProcessing 
Imports Leadtools.ImageProcessing.Core 
      Leadtools.Examples.Support.SetLicense() 
 
Public Sub WindowLevelCommandExample() 
   Dim codecs As New RasterCodecs() 
   codecs.ThrowExceptionsOnInvalidImages = True 
 
   Dim leadImage As RasterImage = codecs.Load(Path.Combine(LEAD_VARS.ImagesDir, "IMAGE3.dcm")) 
 
   ' Prepare the command 
   'Change the image to 16-bit grayscale 
   Dim graycommand As GrayscaleCommand = New GrayscaleCommand(16) 
   Dim command As WindowLevelCommand = New WindowLevelCommand 
   graycommand.Run(leadImage) 
 
   Dim minValue As Integer = leadImage.MinValue 
   Dim maxValue As Integer = leadImage.MaxValue 
   Dim minBit As Integer = leadImage.LowBit 
   Dim maxBit As Integer = leadImage.HighBit 
 
   Dim Size As Integer = (1 << (maxBit - minBit + 1)) 
   Dim LookupTable() As RasterColor 
   ReDim LookupTable(Size - 1) 
 
   ' fill the first half of the LookupTable with RED. 
   Dim x As Integer 
   For x = 0 To Size \ 2 - 1 
      LookupTable(x) = New RasterColor(255, 0, 0) 
   Next 
 
   ' fill the rest with gray values. 
   For x = Size \ 2 To Size - 1 
      Dim y As Byte = Convert.ToByte((x - minValue) * 255 / (maxValue - minValue)) 
      LookupTable(x) = New RasterColor(y, y, y) 
   Next 
 
   command.HighBit = maxBit 
   command.LowBit = minBit 
 
   command.LookupTable = LookupTable 
   command.Order = RasterByteOrder.Bgr 
   command.Run(leadImage) 
 
End Sub 
 
Public NotInheritable Class LEAD_VARS 
   Public Const ImagesDir As String = "C:\Users\Public\Documents\LEADTOOLS Images" 
End Class

using Leadtools; 
using Leadtools.Examples; 
using Leadtools.Codecs; 
using Leadtools.ImageProcessing; 
using Leadtools.ImageProcessing.Core; 
 
public void WindowLevelCommandExample(RasterImage image, Stream outStream) 
{ 
   // 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); 
   // Save result image 
   RasterCodecs codecs = new RasterCodecs(); 
   codecs.Save(image, outStream, RasterImageFormat.Jpeg, 24); 
   image.Dispose(); 
}

Imports Leadtools 
Imports Leadtools.Codecs 
Imports Leadtools.ImageProcessing 
Imports Leadtools.ImageProcessing.Core 
 
Public Sub WindowLevelCommandExample(ByVal image As RasterImage, ByVal outStream As Stream) 
   ' Prepare the command 
   Dim x As Integer 
   Dim y As Byte 
   Dim Size As Integer 
   Dim LookupTable As RasterColor() 
 
   'Change the image to 16-bit grayscale 
   Dim graycommand As GrayscaleCommand = New GrayscaleCommand(16) 
   Dim MinMaxBits As MinMaxBitsCommand = New MinMaxBitsCommand() 
   Dim MinMaxValues As MinMaxValuesCommand = New MinMaxValuesCommand() 
   Dim command As WindowLevelCommand = New WindowLevelCommand() 
 
   graycommand.Run(image) 
   MinMaxBits.Run(image) 
   MinMaxValues.Run(image) 
 
   Size = (1 << (MinMaxBits.MaximumBit - MinMaxBits.MinimumBit + 1)) 
   LookupTable = New RasterColor(Size - 1) {} 
 
   ' fill the first half of the LookupTable with RED. 
   x = 0 
   Do While x < Size / 2 
      LookupTable(x) = New RasterColor(255, 0, 0) 
      x += 1 
   Loop 
 
   ' fill the rest with gray values. 
   x = Size / 2 
   Do While x < Size 
      y = CByte((x - MinMaxValues.MinimumValue) * 255 / (MinMaxValues.MaximumValue - MinMaxValues.MinimumValue)) 
      LookupTable(x) = New RasterColor(y, y, y) 
      x += 1 
   Loop 
 
   command.HighBit = MinMaxBits.MaximumBit 
   command.LowBit = MinMaxBits.MinimumBit 
   command.LookupTable = LookupTable 
   command.Order = RasterByteOrder.Bgr 
 
   command.Run(image) 
   ' Save result image 
   Dim codecs As RasterCodecs = New RasterCodecs() 
   codecs.Save(image, outStream, RasterImageFormat.Jpeg, 24) 
   image.Dispose() 
End Sub