docs: def _fix_lsm_bitspersample(self, parent):
          """Correct LSM bitspersample tag.
  
          Old LSM writers may use a separate region for two 16-bit values,
          although they fit into the tag value element of the tag.
  
          """
          if self.code != 258 or self.count != 2:
              return
          # TODO: test this case; need example file
          log.warning('TiffTag %i: correcting LSM bitspersample tag', self.code)
          value = struct.pack('<HH', *self.value)
          self.valueoffset = struct.unpack('<I', value)[0]
          parent.filehandle.seek(self.valueoffset)
          self.value = struct.unpack('<HH', parent.filehandle.read(4))