Gets the WriteableBitmap that the specified RasterImage is linked to.
image
The RasterImage specified for the image.
The Windows.UI.Xaml.Media.ImageSource that the specified RasterImage is linked to, otherwise it returns null.
Avoid making a copy of the actual image data when converting to / from a Windows.UI.Xaml.Media.ImageSource by using the ConvertToImageOptions.LinkImage flag.