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WindowLevelEffect Class

Summary
Fills and applies window leveling on the specified image.
Syntax
C#
C++
public class WindowLevelEffect : ShaderEffect 
vb[VB Syntax] 
  
Public Class WindowLevelEffect  
   Inherits System.Windows.Media.Effects.ShaderEffect 
   Implements System.Windows.Media.Animation.IAnimatable 
public ref class WindowLevelEffect : public System.Windows.Media.Effects.ShaderEffect, System.Windows.Media.Animation.IAnimatable   
Remarks

Provides "on demand" window-leveling as an effect and does not alter the image data.

To learn more about window-leveling, refer to RasterImage.WindowLevel, RasterImage.WindowLevelExt, WindowLevelCommand, Leadtools.ImageProcessing.Core.WindowLevelExtCommand, Saving Window-Leveled Images , and Changing Brightness and Contrast.

Example
C#
using Leadtools; 
using Leadtools.Codecs; 
using Leadtools.ImageProcessing; 
using Leadtools.Windows.Controls; 
using Leadtools.Windows.Media; 
using Leadtools.Windows.Media.Effects; 
 
class WindowLevelEffectExampleWindow : Window 
{ 
   public WindowLevelEffectExampleWindow() 
   { 
      StackPanel sp = new StackPanel(); 
      Content = sp; 
 
      RasterImageViewer theViewer = new RasterImageViewer(); 
 
      theViewer.HorizontalAlignment = HorizontalAlignment.Center; 
      theViewer.VerticalAlignment = VerticalAlignment.Top; 
      theViewer.ImageHorizontalAlignment = HorizontalAlignment.Left; 
      theViewer.ImageVerticalAlignment = VerticalAlignment.Top; 
 
      sp.Children.Add(theViewer); 
 
      // Load an image into the viewer 
      using (RasterCodecs codecs = new RasterCodecs()) 
      { 
         theViewer.Image = codecs.Load(System.IO.Path.Combine(LEAD_VARS.ImagesDir, "Image3.dcm")); 
      } 
 
      // Create the sliders 
      TextBlock tb = new TextBlock(); 
      tb.HorizontalAlignment = HorizontalAlignment.Center; 
      tb.Text = "Window Width:"; 
      sp.Children.Add(tb); 
 
      Slider windowWidthSlider = new Slider(); 
      windowWidthSlider.Minimum = 0.0; 
      windowWidthSlider.Maximum = Math.Pow(2, theViewer.Image.BitsPerPixel - 1); 
      windowWidthSlider.Width = 400; 
      windowWidthSlider.Orientation = Orientation.Horizontal; 
      windowWidthSlider.IsSnapToTickEnabled = true; 
      windowWidthSlider.TickPlacement = System.Windows.Controls.Primitives.TickPlacement.BottomRight; 
      windowWidthSlider.TickFrequency = 0.1; 
      windowWidthSlider.AutoToolTipPrecision = 2; 
      windowWidthSlider.AutoToolTipPlacement = System.Windows.Controls.Primitives.AutoToolTipPlacement.BottomRight; 
 
      sp.Children.Add(windowWidthSlider); 
 
      tb = new TextBlock(); 
      tb.HorizontalAlignment = HorizontalAlignment.Center; 
      tb.Text = "Window Center:"; 
      sp.Children.Add(tb); 
 
      Slider windowCenterSlider = new Slider(); 
      windowCenterSlider.Minimum = 0.0; 
      windowCenterSlider.Maximum = Math.Pow(2, theViewer.Image.BitsPerPixel - 1); 
      windowCenterSlider.Width = 400; 
      windowCenterSlider.Orientation = Orientation.Horizontal; 
      windowCenterSlider.IsSnapToTickEnabled = true; 
      windowCenterSlider.TickPlacement = System.Windows.Controls.Primitives.TickPlacement.BottomRight; 
      windowCenterSlider.TickFrequency = 0.1; 
      windowCenterSlider.AutoToolTipPrecision = 2; 
      windowCenterSlider.AutoToolTipPlacement = System.Windows.Controls.Primitives.AutoToolTipPlacement.BottomRight; 
 
      sp.Children.Add(windowCenterSlider); 
 
      // Setup the effect 
      WindowLevelEffect effect = new WindowLevelEffect(); 
 
      // Set the texture 
      effect.FillGrayTexture(theViewer.Image); 
      effect.Start = Colors.Black; 
      effect.End = Colors.White; 
      effect.CurveType = CurveType.Linear; 
      effect.Factor = 0.0; 
 
      effect.WindowWidth = Math.Pow(2, theViewer.Image.MaxValue - theViewer.Image.MinValue); 
      effect.WindowCenter = effect.WindowWidth / 2; 
 
      theViewer.ImageEffect = effect; 
 
      // Bind the properties 
      Binding bind = new Binding(); 
      bind.Source = effect; 
      bind.UpdateSourceTrigger = UpdateSourceTrigger.PropertyChanged; 
      bind.Path = new PropertyPath("WindowWidth"); 
      windowWidthSlider.SetBinding(Slider.ValueProperty, bind); 
 
      bind = new Binding(); 
      bind.Source = effect; 
      bind.UpdateSourceTrigger = UpdateSourceTrigger.PropertyChanged; 
      bind.Path = new PropertyPath("WindowCenter"); 
      windowCenterSlider.SetBinding(Slider.ValueProperty, bind); 
 
      Title = "Using WindowLevelEffect"; 
   } 
} 
 
static class LEAD_VARS 
{ 
   public const string ImagesDir = @"C:\LEADTOOLS22\Resources\Images"; 
} 
Requirements

Target Platforms

Help Version 22.0.2022.4.4
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Leadtools.Windows.Media.Effects Assembly

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© 1991-2022 LEAD Technologies, Inc. All Rights Reserved.