Return QPImage without background correction

def get_qpimage_raw(self, idx):
        """Return QPImage without background correction"""
        with self._qpseries() as qps:
            qpi = qps.get_qpimage(index=idx).copy()
        # Remove previously performed background correction
        qpi.set_bg_data(None)
        # Force meta data
        for key in self.meta_data:
            qpi[key] = self.meta_data[key]
        # set identifier
        qpi["identifier"] = self.get_identifier(idx)
        return qpi