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Opacity Mask from Drawing

<Window x:Class="Workspace.DockExample"     xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"     xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"     Title="Workspace" Width="640" Height="480">     <Image Height="150" Width="200" Source="c:\image.jpg">       <Image.OpacityMask>         <DrawingBrush>           <DrawingBrush.Drawing>             <GeometryDrawing>               <GeometryDrawing.Brush>                 <RadialGradientBrush>                   <RadialGradientBrush.GradientStops>                     <GradientStop Offset="0" Color="Black" />                     <GradientStop Offset="1" Color="Transparent" />                   </RadialGradientBrush.GradientStops>                 </RadialGradientBrush>               </GeometryDrawing.Brush>               <GeometryDrawing.Geometry>                 <RectangleGeometry Rect="0.05,0.05 0.9,0.9" />               </GeometryDrawing.Geometry>               <GeometryDrawing.Pen>                 <Pen Thickness="0.1" Brush="Black" />               </GeometryDrawing.Pen>             </GeometryDrawing>           </DrawingBrush.Drawing>         </DrawingBrush>       </Image.OpacityMask>     </Image> </Window>