public static Bitmap Apply(string input, ImageFilters.Filter filter)
 {
   return Apply(new Bitmap(input), filter);
 }
 public static Bitmap Apply(Bitmap input, ImageFilters.Filter filter)
 {
   List<ImageFilters.Filter> filters = new List<ImageFilters.Filter>(1);
   filters.Add(filter);
   return Apply(input, filters);
 }