BrightExtractEffect Class

Adjust the image brightness based on the given threshold.

Object Model

Syntax

Visual Basic
C#
Objective-C
Java
C++

public class BrightExtractEffect : System.Windows.Media.Effects.ShaderEffect, System.Windows.Media.Animation.IAnimatable

'Declaration
 
Public Class BrightExtractEffect 
   Inherits System.Windows.Media.Effects.ShaderEffect
   Implements System.Windows.Media.Animation.IAnimatable

'Usage
 
Dim instance As BrightExtractEffect

ObjectiveC Syntax

Java Syntax

public ref class BrightExtractEffect : public System.Windows.Media.Effects.ShaderEffect, System.Windows.Media.Animation.IAnimatable

Example

Visual Basic
C#
WinRT C#
WinRT JavaScript
Silverlight C#
Silverlight VB

Copy 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

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";
}

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);
   }
}

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

<Window x:Class="BrightExtractEffectExample"
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"
Height="600" Width="800">
   <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>

Requirements

Target Platforms: Windows 7, Windows Vista SP1 or later, Windows XP SP3, Windows Server 2008 (Server Core not supported), Windows Server 2008 R2 (Server Core supported with SP1 or later), Windows Server 2003 SP2

Reference

BrightExtractEffect Members
Leadtools.Windows.Media.Effects Namespace
Introduction