docs: def render_to_image_file(
          self, image_out_path, width_pixels=None, height_pixels=None, dpi=90
      ):
          """Render the SubjectInfo to an image file.
  
          Args:
              image_out_path : str
                  Path to where image image will be written. Valid extensions are
                  ``.svg,`` ``.pdf``, and ``.png``.
  
              width_pixels : int
                  Width of image to write.
  
              height_pixels : int
                  Height of image to write, in pixels.
  
              dpi:
                  Dots Per Inch to declare in image file. This does not change the
                  resolution of the image but may change the size of the image when
                  rendered.
  
          Returns:
              None
  
          """
          self._render_type = "file"
          self._tree.render(
              file_name=image_out_path,
              w=width_pixels,
              h=height_pixels,
              dpi=dpi,
              units="px",
              tree_style=self._get_tree_style(),
          )