code: def generate_tile(self, region, size):
          
          r = IIIFRequest(identifier=self.identifier,
                          api_version=self.api_version)
          if (region == 'full'):
              r.region_full = True
          else:
              r.region_xywh = region  # [rx,ry,rw,rh]
          r.size_wh = size  # [sw,sh]
          r.format = 'jpg'
          self.generate_file(r, True)
docs: Generate one tile for this given region, size of this image.