code: def greyInput(self):
          
  
          self.d.update(dict(profileclass='scnr',
                             colourspace='GRAY', pcs='XYZ '))
          return self
docs: Adjust ``self.d`` dictionary for greyscale input device.
          ``profileclass`` is 'scnr', ``colourspace`` is 'GRAY', ``pcs``
          is 'XYZ '.