docs: def from_stream(cls, stream):
          """
          Return |Exif| instance having header properties parsed from Exif
          image in *stream*.
          """
          markers = _JfifMarkers.from_stream(stream)
          # print('\n%s' % markers)
  
          px_width = markers.sof.px_width
          px_height = markers.sof.px_height
          horz_dpi = markers.app1.horz_dpi
          vert_dpi = markers.app1.vert_dpi
  
          return cls(px_width, px_height, horz_dpi, vert_dpi)