def blank(self, width, height, background=None):
        if not isinstance(width, numbers.Integral) or width < 1:
            raise TypeError('width must be a natural number, not ' +
                            repr(width))
        if not isinstance(height, numbers.Integral) or height < 1:
            raise TypeError('height must be a natural number, not ' +
                            repr(height))
        if background is not None and not isinstance(background, Color):
            raise TypeError('background must be a wand.color.Color '
                            'instance, not ' + repr(background))
        if background is None:
            background = Color('transparent')
        with background:
            r = library.MagickNewImage(self.wand, width, height,
                                       background.resource)
            if not r:
                self.raise_exception()
        return self
Get a list of all the keys used in the run_metadata table
dataset/ETHPy150Open dahlia/wand/wand/image.py/Image.blank--crossover with--dataset/ETHPy150Open openstack-infra/subunit2sql/subunit2sql/db/api.py/get_all_run_metadata_keys