docs: 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