AdjustContrast Exceptions


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; }
    if ( value != _contrast )
        _contrast = value;
        OnPropertyChanged( "Contrast" );

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
Message=Exception from HRESULT: 0x88980003
   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

Any help would be appreciated!


Rick B
Closed Jul 1, 2015 at 4:58 PM by teichgraf
Not an issue.


teichgraf wrote Jul 1, 2015 at 4:58 PM

This is not an issue with the lib. This is rather something for the discussion forums.
Anyway, make sure your OriginalImageSource instance is already initialized when you perform the operation. Check it's pixel width and height properties to make sure those are > 0.

wrote Jul 1, 2015 at 4:58 PM