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GammaCorrectCommandBitmapEffect Class
See Also  Members   Example 
Leadtools.Windows.Media.Effects.Color Namespace : GammaCorrectCommandBitmapEffect Class





Adjusts the intensity of colors in an image by changing the gamma constant that is used to map the intensity values.

Syntax

Visual Basic (Declaration) 
Public Class GammaCorrectCommandBitmapEffect 
   Inherits RasterCommandBitmapEffect
Visual Basic (Usage)Copy Code
Dim instance As GammaCorrectCommandBitmapEffect
C# 
public class GammaCorrectCommandBitmapEffect : RasterCommandBitmapEffect 
C++/CLI 
public ref class GammaCorrectCommandBitmapEffect : public RasterCommandBitmapEffect 
XAML Property Element Usage 

GammaCorrectCommandBitmapEffect ...

XAML Property Element Usage 

GammaCorrectCommandBitmapEffect ...

Example

Run the GammaCorrectCommandBitmapEffect on an image and apply gamma correction.

Visual BasicCopy Code
Public Sub GammaCorrectCommandBitmapEffectExample(ByVal element As FrameworkElement)
   ' Initialize Effect
   Dim effect As GammaCorrectCommandBitmapEffect = New GammaCorrectCommandBitmapEffect()
   effect.Gamma = 250
   element.BitmapEffect = effect

   ' Initialize Animations
   Dim animation1 As Int32Animation = New Int32Animation()
   animation1.From = 1
   animation1.To = 1000
   animation1.By = 1
   animation1.Duration = New Duration(TimeSpan.FromSeconds(2.0))
   animation1.AutoReverse = True
   animation1.RepeatBehavior = RepeatBehavior.Forever

   ' Initialize and run Storyboard
   Dim storyboard As Storyboard = New Storyboard()
   storyboard.SetTargetName(animation1, "AnimatedBitmapEffect")
   storyboard.SetTargetProperty(animation1, New PropertyPath(GammaCorrectCommandBitmapEffect.GammaProperty))
   element.RegisterName("AnimatedBitmapEffect", effect)
   storyboard.Children.Add(animation1)

   storyboard.Begin(element)
End Sub
C#Copy Code
public void GammaCorrectCommandBitmapEffectExample(FrameworkElement element) 

 
   // Initialize Effect 
   GammaCorrectCommandBitmapEffect effect = new GammaCorrectCommandBitmapEffect(); 
   effect.Gamma = 250; 
   element.BitmapEffect = effect; 
 
   // Initialize Animations 
   Int32Animation animation1 = new Int32Animation(); 
   animation1.From = 1; 
   animation1.To = 1000; 
   animation1.By = 1; 
   animation1.Duration = new Duration(TimeSpan.FromSeconds(2.0)); 
   animation1.AutoReverse = true; 
   animation1.RepeatBehavior = RepeatBehavior.Forever; 
 
   // Initialize and run Storyboard 
   Storyboard storyboard = new Storyboard(); 
   Storyboard.SetTargetName(animation1, "AnimatedBitmapEffect"); 
   Storyboard.SetTargetProperty(animation1, new PropertyPath(GammaCorrectCommandBitmapEffect.GammaProperty)); 
   element.RegisterName("AnimatedBitmapEffect", effect); 
   storyboard.Children.Add(animation1); 
 
   storyboard.Begin(element); 
}
XAMLCopy Code
<Page Title="CSAnimateEffect" Height="391" Width="300" xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" xmlns:lteffects="clr-namespace:Leadtools.Windows.Media.Effects.Color;assembly=Leadtools.Windows.Media.Effects"> 
  <Grid> 
    <Image Margin="10,10,10,10" HorizontalAlignment="Center" VerticalAlignment="Center" Source="C:\Program Files\LEAD Technologies, Inc\LEADTOOLS 16\Images\slave.jpg"> 
      <Image.BitmapEffect> 
        <lteffects:GammaCorrectCommandBitmapEffect x:Name="MyBitmapEffect" Gamma="1" /> 
      </Image.BitmapEffect> 
      <Image.Triggers> 
        <EventTrigger RoutedEvent="Image.Loaded"> 
          <BeginStoryboard> 
            <Storyboard> 
              <Int32Animation Storyboard.TargetName="MyBitmapEffect" Storyboard.TargetProperty="Gamma" From="1" To="1000" Duration="0:0:2" RepeatBehavior="Forever" AutoReverse="True" /> 
            </Storyboard> 
          </BeginStoryboard> 
        </EventTrigger> 
      </Image.Triggers> 
    </Image> 
  </Grid> 
</Page>

Remarks

  • Intensity values ideally follow a logarithmic progression, because the eye perceives changes in intensity as being equal when the ratio of change is equal. For example, we would see a change from 0.1 to 0.2 as being equal to a change from 0.2 to 0.4.
  • Gamma is a standard constant that is used to calculate the progression. For most CRTs the gamma constant is in the range of 2.2 to 2.5.

Inheritance Hierarchy

System.Object
   System.Windows.Threading.DispatcherObject
      System.Windows.DependencyObject
         System.Windows.Freezable
            System.Windows.Media.Animation.Animatable
               System.Windows.Media.Effects.BitmapEffect
                  Leadtools.Windows.Media.Effects.RasterCommandBitmapEffect
                     Leadtools.Windows.Media.Effects.Color.GammaCorrectCommandBitmapEffect

Requirements

Target Platforms: Microsoft .NET Framework 3.0, Windows XP, Windows Vista, Windows Server 2003 family, Windows Server 2008 family

See Also