def _check_color_image(image):
    """ verify proper image

    :param ndarray image:
    :return bool:

    >>> _check_color_image(np.zeros((200, 250, 1)))  # doctest: +ELLIPSIS
    Traceback (most recent call last):
    ...
    ValueError: image is not RGB with dims (200, 250, 1)
    """
    if image.ndim != 3 or image.shape[2] != 3:
        raise ValueError('image is not RGB with dims %s' % repr(image.shape))
    return True