code: def _getProcessedImage(self):
          
          if self.imageDisp is None:
              self.imageDisp = self.image
              self.levelMin, self.levelMax = self._quickLevels(
                  self.imageDisp)
              #list( map(float, self._quickLevels(self.imageDisp)))
          return self.imageDisp
docs: Returns the image data after it has been processed by any normalization options in use.
          This method also sets the attributes self.levelMin and self.levelMax 
          to indicate the range of data in the image.