code: def dimensionNames(self):
          
          if self._array is None:
              return []
  
          if self._array.ndim == 2:
              return ['Y', 'X']
          elif self._array.ndim == 3:
              return ['Y', 'X', 'Band']
          else:
              # Defensive programming: fall back on default names
              msg = "Expected 3D image. Got: {}".format(self._array.ndim)
              if DEBUGGING:
                  raise ValueError(msg)
              logger.warn(msg)
              return super(PillowFileRti, self).dimensionNames
docs: Returns ['Y', 'X', 'Band'].
              The underlying array is expected to be 3-dimensional. If this is not the case we fall
              back on the default dimension names ['Dim-0', 'Dim-1', ...]