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BrightExtractEffect Class
See Also  Members  
Leadtools.Windows.Media.Effects Namespace : BrightExtractEffect Class



The BrightExtractEffect Class supports WPF/Silverlight.

Adjust the image brightness based on the given threshold. Supported in Silverlight

Object Model

BrightExtractEffect Class

Syntax

Visual Basic (Declaration) 
Public Class BrightExtractEffect 
   Inherits System.Windows.Media.Effects.ShaderEffect
   Implements IAnimatable 
Visual Basic (Usage)Copy Code
Dim instance As BrightExtractEffect
C# 
public class BrightExtractEffect : System.Windows.Media.Effects.ShaderEffect, IAnimatable 
C++/CLI 
public ref class BrightExtractEffect : public System.Windows.Media.Effects.ShaderEffect, IAnimatable 

Example

Visual BasicCopy Code
Class BrightExtractEffectExampleWindow
      Inherits Window
      Public Sub New()
         Dim sp As New StackPanel()
         Content = sp
         Dim theViewer As New ImageViewer()

         theViewer.HorizontalAlignment = HorizontalAlignment.Center
         theViewer.VerticalAlignment = VerticalAlignment.Top
         theViewer.ImageHorizontalAlignment = HorizontalAlignment.Left
         theViewer.ImageVerticalAlignment = VerticalAlignment.Top

         sp.Children.Add(theViewer)

         ' Create the slider
         Dim tb As New TextBlock()
         tb.HorizontalAlignment = HorizontalAlignment.Center
         tb.Text = "Threshold:"
         sp.Children.Add(tb)

         Dim theSlider As New Slider()
         theSlider.Minimum = -1.0
         theSlider.Maximum = 1.0
         theSlider.Width = 400
         theSlider.Orientation = Orientation.Horizontal
         theSlider.IsSnapToTickEnabled = True
         theSlider.TickPlacement = System.Windows.Controls.Primitives.TickPlacement.BottomRight
         theSlider.TickFrequency = 0.1
         theSlider.AutoToolTipPrecision = 2
         theSlider.AutoToolTipPlacement = System.Windows.Controls.Primitives.AutoToolTipPlacement.BottomRight

         sp.Children.Add(theSlider)

         ' Load an image into the viewer
         theViewer.Source = New BitmapImage(New Uri(System.IO.Path.Combine(LEAD_VARS.ImagesDir, "Cannon.jpg")))

         ' Create the effect
         Dim effect As New BrightExtractEffect()
         effect.Threshold = 0.7
         theViewer.ImageEffect = effect

         ' Bind the properties
         Dim bind As New Binding()
         bind.Source = effect
         bind.UpdateSourceTrigger = UpdateSourceTrigger.PropertyChanged
         bind.Path = New PropertyPath("Threshold")
         theSlider.SetBinding(Slider.ValueProperty, bind)

         Title = "Using BrightExtractEffect"
      End Sub
   End Class

Public NotInheritable Class LEAD_VARS
   Public Const ImagesDir As String = "C:\Users\Public\Documents\LEADTOOLS Images"
End Class
C#Copy Code
class BrightExtractEffectExampleWindow : Window
   {
      public BrightExtractEffectExampleWindow()
      {
         StackPanel sp = new StackPanel();
         Content = sp;
         ImageViewer theViewer = new ImageViewer();

         theViewer.HorizontalAlignment = HorizontalAlignment.Center;
         theViewer.VerticalAlignment = VerticalAlignment.Top;
         theViewer.ImageHorizontalAlignment = HorizontalAlignment.Left;
         theViewer.ImageVerticalAlignment = VerticalAlignment.Top;

         sp.Children.Add(theViewer);

         // Create the slider
         TextBlock tb = new TextBlock();
         tb.HorizontalAlignment = HorizontalAlignment.Center;
         tb.Text = "Threshold:";
         sp.Children.Add(tb);

         Slider theSlider = new Slider();
         theSlider.Minimum = -1.0;
         theSlider.Maximum = 1.0;
         theSlider.Width = 400;
         theSlider.Orientation = Orientation.Horizontal;
         theSlider.IsSnapToTickEnabled = true;
         theSlider.TickPlacement = System.Windows.Controls.Primitives.TickPlacement.BottomRight;
         theSlider.TickFrequency = 0.1;
         theSlider.AutoToolTipPrecision = 2;
         theSlider.AutoToolTipPlacement = System.Windows.Controls.Primitives.AutoToolTipPlacement.BottomRight;

         sp.Children.Add(theSlider);

         // Load an image into the viewer
         theViewer.Source = new BitmapImage(new Uri(System.IO.Path.Combine(LEAD_VARS.ImagesDir, "Cannon.jpg")));

         // Create the effect
         BrightExtractEffect effect = new BrightExtractEffect();
         effect.Threshold = 0.7;
         theViewer.ImageEffect = effect;

         // Bind the properties
         Binding bind = new Binding();
         bind.Source = effect;
         bind.UpdateSourceTrigger = UpdateSourceTrigger.PropertyChanged;
         bind.Path = new PropertyPath("Threshold");
         theSlider.SetBinding(Slider.ValueProperty, bind);

         Title = "Using BrightExtractEffect";
      }
   }

static class LEAD_VARS
{
   public const string ImagesDir = @"C:\Users\Public\Documents\LEADTOOLS Images";
}
SilverlightCSharpCopy Code
class BrightExtractEffectExampleWindow : UserControl
{
   public BrightExtractEffectExampleWindow()
   {
      StackPanel sp = new StackPanel();
      Content = sp;
      ImageViewer theViewer = new ImageViewer();

      theViewer.HorizontalAlignment = HorizontalAlignment.Center;
      theViewer.VerticalAlignment = VerticalAlignment.Top;
      theViewer.ImageHorizontalAlignment = HorizontalAlignment.Left;
      theViewer.ImageVerticalAlignment = VerticalAlignment.Top;

      sp.Children.Add(theViewer);

      // Create the slider
      TextBlock tb = new TextBlock();
      tb.HorizontalAlignment = HorizontalAlignment.Center;
      tb.Text = "Threshold:";
      sp.Children.Add(tb);

      Slider theSlider = new Slider();
      theSlider.Minimum = -1.0;
      theSlider.Maximum = 1.0;
      theSlider.Width = 400;
      theSlider.Orientation = Orientation.Horizontal;

      sp.Children.Add(theSlider);

      // Load an image into the viewer
      theViewer.Source = new BitmapImage(new Uri(LeadtoolsExamples.Common.ImagesPath.Path + "Cannon.jpg"));

      // Create the effect
      BrightExtractEffect effect = new BrightExtractEffect();
      effect.Threshold = 0.7;
      theViewer.ImageEffect = effect;

      // Bind the properties
      Binding bind = new Binding();
      bind.Source = effect;
      bind.UpdateSourceTrigger = UpdateSourceTrigger.Default;
      bind.Path = new PropertyPath("Threshold");
      theSlider.SetBinding(Slider.ValueProperty, bind);
   }
}
SilverlightVBCopy Code
Class BrightExtractEffectExampleWindow
   Inherits UserControl
   Public Sub New()
      Dim sp As New StackPanel()
      Content = sp
      Dim theViewer As New ImageViewer()

      theViewer.HorizontalAlignment = HorizontalAlignment.Center
      theViewer.VerticalAlignment = VerticalAlignment.Top
      theViewer.ImageHorizontalAlignment = HorizontalAlignment.Left
      theViewer.ImageVerticalAlignment = VerticalAlignment.Top

      sp.Children.Add(theViewer)

      ' Create the slider
      Dim tb As New TextBlock()
      tb.HorizontalAlignment = HorizontalAlignment.Center
      tb.Text = "Threshold:"
      sp.Children.Add(tb)

      Dim theSlider As New Slider()
      theSlider.Minimum = -1.0
      theSlider.Maximum = 1.0
      theSlider.Width = 400
      theSlider.Orientation = Orientation.Horizontal

      sp.Children.Add(theSlider)

      ' Load an image into the viewer
      theViewer.Source = New BitmapImage(New Uri(LeadtoolsExamples.Common.ImagesPath.Path + "Cannon.jpg"))

      ' Create the effect
      Dim effect As New BrightExtractEffect()
      effect.Threshold = 0.7
      theViewer.ImageEffect = effect

      ' Bind the properties
      Dim bind As New Binding()
      bind.Source = effect
      bind.UpdateSourceTrigger = UpdateSourceTrigger.Default
      bind.Path = New PropertyPath("Threshold")
      theSlider.SetBinding(Slider.ValueProperty, bind)

   End Sub
End Class
XAMLCopy Code
<Window x:Class="BrightExtractEffectExample" Height="600" Width="800" xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" xmlns:leadControls="clr-namespace:Leadtools.Windows.Controls;assembly=Leadtools.Windows.Controls" xmlns:leadEffects="clr-namespace:Leadtools.Windows.Media.Effects;assembly=Leadtools.Windows.Media.Effects">
  <StackPanel>
    <leadControls:ImageViewer HorizontalAlignment="Center" VerticalAlignment="Top" ImageHorizontalAlignment="Left" ImageVerticalAlignment="Top" Source="file:///c:\users\Public\Documents\LEADTOOLS Images\cannon.jpg">
      <leadControls:ImageViewer.ImageEffect>
        <leadEffects:BrightExtractEffect Threshold="{Binding Value, ElementName=ThresholdSlider, UpdateSourceTrigger=PropertyChanged}"></leadEffects:BrightExtractEffect>
      </leadControls:ImageViewer.ImageEffect>
    </leadControls:ImageViewer>
    <TextBlock HorizontalAlignment="Center" Text="Threshold:" />
    <Slider x:Name="ThresholdSlider" Minimum="-1.0" Maximum="1.0" TickFrequency="0.1" Width="400" Orientation="Horizontal" IsSnapToTickEnabled="True" TickPlacement="BottomRight" AutoToolTipPrecision="2" AutoToolTipPlacement="BottomRight"></Slider>
  </StackPanel>
</Window>

Inheritance Hierarchy

System.Object
   System.Windows.Threading.DispatcherObject
      System.Windows.DependencyObject
         System.Windows.Freezable
            System.Windows.Media.Animation.Animatable
               System.Windows.Media.Effects.Effect
                  System.Windows.Media.Effects.ShaderEffect
                     Leadtools.Windows.Media.Effects.BrightExtractEffect

Requirements

Target Platforms: Silverlight 3.0, Windows XP, Windows Server 2003 family, Windows Server 2008 family, Windows Vista, Windows 7, MAC OS/X (Intel Only)

See Also