Return a correctly shaped numpy array given the image bytes.

def unpack_rgb_image(plane):
    """Return a correctly shaped numpy array given the image bytes."""
    assert plane.bits_per_pixel == 24, "{} != 24".format(plane.bits_per_pixel)
    size = point.Point.build(plane.size)
    data = np.frombuffer(plane.data, dtype=np.uint8)
    return data.reshape(size.y, size.x, 3)