code: def run_command(self, input_file, output_dir=None):
          
          base_name = os.path.basename(input_file)
          name, suffix = base_name.split('.', 1)
          output_file = '{}{}.tif'.format(name, self.split_pattern)
          if output_dir:
              output_file = os.path.join(output_dir, output_file)
          return ['bfconvert', input_file, output_file]
docs: Return the command for running bfconvert as a list.
          
          :param input_file: path to microscopy image to be converted
          :param ouput_dir: directory to write output tiff files to
          :returns: list