Created Unassigned: AdjustContrast Exceptions [21932]

I am trying to use the ContrastAdjust filter by tying a WPF Slider control to an image.

In the snippet below, the Value property of the slider is bound to the Contrast property in the ViewModel.
In addition ImageSource is a BitmapSource that the Image control's Source property is bound to.

public double Contrast
{
get { return _contrast; }
set
{
if ( value != _contrast )
{
_contrast = value;
OnPropertyChanged( "Contrast" );
}
CreateConvertedImage();
}
}

protected override void CreateConvertedImage()
{
if ( OriginalImageSource != null )
{
WriteableBitmap writeable = new WriteableBitmap( OriginalImageSource );
ImageSource = writeable.AdjustContrast( Contrast );
}
}

When I grab and drag the slider I get the following exception:

System.Runtime.InteropServices.COMException was unhandled by user code
HResult=-2003304445
Message=Exception from HRESULT: 0x88980003
Source=PresentationCore
ErrorCode=-2003304445
StackTrace:
at System.Windows.Media.Imaging.WriteableBitmap..ctor(Int32 pixelWidth, Int32 pixelHeight, Double dpiX, Double dpiY, PixelFormat pixelFormat, BitmapPalette palette)
at System.Windows.Media.Imaging.BitmapFactory.New(Int32 pixelWidth, Int32 pixelHeight) in d:\My Projects\Visual Studio 2013\Projects\FilterPlay\FilterPlay\Extensions\BitmapFactory.cs:line 47
at System.Windows.Media.Imaging.WriteableBitmapExtensions.AdjustContrast(WriteableBitmap bmp, Double level) in d:\My Projects\Visual Studio 2013\Projects\FilterPlay\FilterPlay\Extensions\WriteableBitmapFilterExtensions.cs:line 290
at FilterPlay.ContrastFilterViewModel.CreateConvertedImage() in d:\My Projects\Visual Studio 2013\Projects\FilterPlay\FilterPlay\ContrastFilterViewModel.cs:line 49
at FilterPlay.ContrastFilterViewModel.set_Contrast(Double value) in d:\My Projects\Visual Studio 2013\Projects\FilterPlay\FilterPlay\ContrastFilterViewModel.cs:line 32
InnerException:

Any help would be appreciated!

Thanks,

Rick B