'Describe a ProfitBricks image
:param      ex_href: The href for the image you are describing
:type       ex_href: ``str``
:param      ex_image_id: The ID for the image you are describing
:type       ex_image_id: ``str``
:return:    Instance of class ``Image``
:rtype:     :class:`Image`'

def ex_describe_image(self, ex_href=None, ex_image_id=None):

    use_full_url = True
    if (ex_href is None):
        if (ex_image_id is None):
            raise ValueError('The    image    ID    is    required.')
        else:
            use_full_url = False
            ex_href = 'images/{image_id}'.format(image_id=ex_image_id)
    response = self.connection.request(action=ex_href, method='GET', with_full_url=use_full_url)
    return self._to_image(response.object)
