docs: def _series_uniform(self):
          """Return all images in file as single series."""
          page = self.pages[0]
          shape = page.shape
          axes = page.axes
          dtype = page.dtype
          validate = not (page.is_scanimage or page.is_nih)
          pages = self.pages._getlist(validate=validate)
          lenpages = len(pages)
          if lenpages > 1:
              shape = (lenpages,) + shape
              axes = 'I' + axes
          if page.is_scanimage:
              kind = 'ScanImage'
          elif page.is_nih:
              kind = 'NIHImage'
          else:
              kind = 'Uniform'
          return [TiffPageSeries(pages, shape, dtype, axes, kind=kind)]