How to: Apply an Effect to Part of an Image
This example demonstrates how to apply a BitmapEffect to a portion of an Image using the BitmapEffectInput property.
Example
The following example shows two ways to apply an effect to a portion of the visual content.
<Page xmlns="https://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="https://schemas.microsoft.com/winfx/2006/xaml">
<Page.Resources>
<BitmapImage x:Key="sourceImage" UriSource="/images/WaterLilies.jpg"/>
</Page.Resources>
<StackPanel>
<DockPanel>
<StackPanel DockPanel.Dock="Left">
<TextBlock>AreaToApplyEffect=".25,.25,.50,.50"</TextBlock>
<TextBlock>AreaToApplyEffectUnits="RelativeToBoundingBox"</TextBlock>
</StackPanel>
<Image Width="360" Source="{StaticResource sourceImage}" Margin="10" DockPanel.Dock="Left">
<Image.BitmapEffect>
<!-- <BitmapEffectGroup> would go here if you wanted to apply more
then one effect to the TextBox. However, in this example only
one effect is being applied so BitmapEffectGroup does not need
to be included. -->
<!-- Effect to Apply to the Image -->
<EmbossBitmapEffect Relief="0.8" LightAngle="320" />
</Image.BitmapEffect>
<Image.BitmapEffectInput>
<!-- BitmapEffectInput is used to apply the bitmap effect to a specified
region of the visual. When this property is not used, the effect
is applied to the entire visual.
AreaToApplyEffect is a rectangular area in which to apply the effect.
- When AreaToApplyEffectUnits is "Absolute", the rectangle is read as
pixel coordinates within the visual.
- When AreaToApplyEffectUnits is "RelativeToBoundingBox",
the rectangle values are relative to the entire bounding box.
Values range between 0 and 1, where (0,0) is the top-left corner
and (1,1) is the bottom-right corner. -->
<BitmapEffectInput AreaToApplyEffect=".25,.25,.50,.50" AreaToApplyEffectUnits="RelativeToBoundingBox"/>
</Image.BitmapEffectInput>
</Image>
</DockPanel>
<DockPanel>
<StackPanel DockPanel.Dock="Left">
<TextBlock>AreaToApplyEffect="90,66,180,135"</TextBlock>
<TextBlock>AreaToApplyEffectUnits="Absolute"</TextBlock>
</StackPanel>
<Image Width="360" Source="{StaticResource sourceImage}" Margin="10" DockPanel.Dock="Left">
<Image.BitmapEffect>
<!-- <BitmapEffectGroup> would go here if you wanted to apply more
then one effect to the TextBox. However, in this example only
one effect is being applied so BitmapEffectGroup does not need
to be included. -->
<!-- Effect to Apply to the Image -->
<EmbossBitmapEffect Relief="0.8" LightAngle="320" />
</Image.BitmapEffect>
<Image.BitmapEffectInput>
<!-- BitmapEffectInput is used to apply the bitmap effect to a specified
region of the visual. When this property is not used, the effect
is applied to the entire visual.
AreaToApplyEffect is a rectangular area in which to apply the effect.
- When AreaToApplyEffectUnits is "Absolute", the rectangle is read as
pixel coordinates within the visual.
- When AreaToApplyEffectUnits is "RelativeToBoundingBox",
the rectangle values are relative to the entire bounding box.
Values range between 0 and 1, where (0,0) is the top-left corner
and (1,1) is the bottom-left corner. -->
<BitmapEffectInput AreaToApplyEffect="90,66,180,135" AreaToApplyEffectUnits="Absolute"/>
</Image.BitmapEffectInput>
</Image>
</DockPanel>
</StackPanel>
</Page>
The following illustration shows an emboss effect applied to only the middle of an image.
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