@abstractmethod
    def get_blue_primaries(self):
        pass
:meth:`get_identity` is always called with no arguments,
dataset/ETHPy150Open mikrosimage/ColorPipe-tools/utils/colorspaces.py/AbstractColorspace.get_blue_primaries--crossover with--dataset/ETHPy150Open dcrosta/dabble/dabble/__init__.py/IdentityProvider.get_identity