docs: def ndpi_tags(self):
          """Return consolidated metadata from Hamamatsu NDPI as dict."""
          if not self.is_ndpi:
              return None
          tags = self.tags
          result = {}
          for name in ('Make', 'Model', 'Software'):
              result[name] = tags[name].value
          for code, name in TIFF.NDPI_TAGS.items():
              code = str(code)
              if code in tags:
                  result[name] = tags[code].value
                  # del tags[code]
          return result