code: def main():
      image = ia.data.quokka()
      image_gray = np.average(image, axis=2).astype(np.uint8)
      image_gray_3d = image_gray[:, :, np.newaxis]
  
      ia.imshow(image)
      ia.imshow(image / 255.0)
      ia.imshow(image_gray)
      ia.imshow(image_gray_3d)
  
label_desc: Use image node_id 1 for calling a global function with example usage: main() without return types