def unregister_filter(self, attr_name):
        if attr_name not in self._filter_registry:
            raise NotRegistered(
                'No FilteredImage subclass is registered to %s' % attr_name
            )
        else:
            del self._filter_registry[attr_name]
Unregister the FilteredImage subclass currently assigned to
dataset/ETHPy150Open WGBH/django-versatileimagefield/versatileimagefield/registry.py/VersatileImageFieldRegistry.unregister_filter