protected async override void OnNavigatedTo(NavigationEventArgs e)
{
WriteableBitmap bitmap = await BitmapFactory.New(1, 1).FromContent(new Uri("ms-appx:///Assets/Image.jpg"));
bitmap = bitmap.AdjustContrast(50.0);
bitmap = bitmap.AdjustBrightness(50);
bitmap = bitmap.Flip(WriteableBitmapExtensions.FlipMode.Vertical);
bitmap.FillRectangle(10, 10, 30, 30, Colors.DarkBlue);
bitmap.FillRectangle(
bitmap.PixelWidth - 30,
bitmap.PixelHeight - 30,
bitmap.PixelWidth - 10,
bitmap.PixelHeight - 10,
Colors.RoyalBlue);
Photo.Source = bitmap;
}