code: def imsave(filename, im, format=None):
      
      # Import imageio or PIL
      imageio, PIL = _check_img_lib()
      if imageio is not None:
          return imageio.imsave(filename, im, format)
      elif PIL is not None:
          pim = PIL.Image.fromarray(im)
          pim.save(filename, format)
      else:
          raise RuntimeError("imsave requires the imageio or PIL package.")
docs: Save image data to disk
  
      Requires imageio or PIL.
  
      Parameters
      ----------
      filename : str
          Filename to write.
      im : array
          Image data.
      format : str | None
          Format of the file. If None, it will be inferred from the filename.
  
      See also
      --------
      imread, read_png, write_png