code: def set_image_colormap(self, cmap_name: str):
      print(f"Changing image colormap to {cmap_name}")
      self.image.cmap = cmap_name
  
imports: import time
  from math import sin, pi
  import numpy
  from PyQt5 import QtWidgets, QtCore
  from vispy.scene import SceneCanvas, visuals
  from vispy.app import use_app, Timer
label_desc: Use image node_id 2 for calling the CanvasWrapper obj's underlying member method code with example usage: obj.set_image_colormap(cmap_name) without return types