versatileimagefield/registry.py
def unregister_filter(self, attr_name):
        """
        Unregister the FilteredImage subclass currently assigned to attr_name.

        If a FilteredImage subclass isn't already registered to filters.
        `attr_name` NotRegistered will raise.
        """
        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]
def unregister_filter(self, attr_name):
        """
        Unregister the FilteredImage subclass currently assigned to attr_name.

        If a FilteredImage subclass isn't already registered to filters.
        `attr_name` NotRegistered will raise.
        """
        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 attr_name.

        If a FilteredImage subclass isn't already registered to filters.
        `attr_name` NotRegistered will raise.