Use Slider to control the Emboss
<Window x:Class="BitmapEffects.Window4"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
Title="Bitmap Effects" Height="538" Width="600"
>
<StackPanel>
<Border Grid.Column="0" Grid.Row="4" Grid.ColumnSpan="2"
Width="300" Height="150">
<Border.BitmapEffect>
<EmbossBitmapEffect
Relief="{Binding Path=Value, ElementName=sliderEmboss}"
/>
</Border.BitmapEffect>
<TextBlock Foreground="White" FontSize="18">EMBOSS</TextBlock>
</Border>
<Slider Minimum="0" Maximum="1" Name="sliderEmboss" Value=".5"
TickFrequency=".1"/>
<TextBox Text="{Binding ElementName=sliderEmboss, Path=Value}"/>
</StackPanel>
</Window>
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