/// <summary>
/// Returns a gray scale image that contains intensity of the specified image.
/// </summary>
/// <param name="source">A <see cref="BitmapSource"/> to compute luminance.</param>
/// <returns>The new <see cref="ByteImage"/>.</returns>
/// <remarks>The coefficient is (1/3. 1/3. 1/3).</remarks>
public static ByteImage ToIntensityImage(this BitmapSource source)
{
var bmp = source.AsGray8();
var data = new byte[bmp.PixelWidth * bmp.PixelHeight];
bmp.CopyPixels(data, bmp.PixelWidth, 0);
return(new ByteImage(bmp.PixelWidth, bmp.PixelHeight, data));
}
