code: def save_image(self, resolution=(1024, 768), **kwargs):
          
          from ..viewer import render_scene
          png = render_scene(scene=self,
                             resolution=resolution,
                             **kwargs)
          return png
docs: Get a PNG image of a scene.
  
          Parameters
          -----------
          resolution: (2,) int, resolution to render image
          **kwargs:  passed to SceneViewer constructor
  
          Returns
          -----------
          png: bytes, render of scene in PNG form