title: Convert a dynamic BitmapImage to a grayscale BitmapImage in a Windows Phone application
body: <p>I would like to Convert a BitmapImage to a Grayscale BitmapImage: Which I get from a method and therefore - the Width and Height are unknown to me. I have tried looking into options such as WritableBitmapEx and static extension methods but they haven't been helpful to me as I would like the return data type to be a BitmapImage as well as I then need to add it to List.</p>
  
  <p>Is this possible in a Windows Phone app using C#? I would really appreciate if someone would shed some light into this. Thank you.</p>