code: def _native_size(self):
          
          EMU_PER_INCH = 914400
          horz_dpi, vert_dpi = self._dpi
          width_px, height_px = self._px_size
  
          width = EMU_PER_INCH * width_px / horz_dpi
          height = EMU_PER_INCH * height_px / vert_dpi
  
          return width, height
docs: A (width, height) 2-tuple representing the native dimensions of the
          image in EMU, calculated based on the image DPI value, if present,
          assuming 72 dpi as a default.