code: def multiply_color(clip, factor):
      """
      Multiplies the clip's colors by the given factor, can be used
      to decrease or increase the clip's brightness (is that the
      right word ?)
      """
      return clip.image_transform(
          lambda frame: np.minimum(255, (factor * frame)).astype(
              "uint8"
          )
      )
  
label_desc: Use image node_id 1 for calling a global function with example usage: multiply_color(clip, factor) and returns: clip