code: def loadImage(fn=None):
      global pixels, imWidth, imHeight, wWidth, wHeight
      try:
          im = Image.open(fn)  # Open the image
      except IOError:
          print(
              "Usage:",
              os.path.basename(sys.argv[0]),
              "[IMAGE=defaultimage.jpg]",
          )
          print("Can't open", fn)
          sys.exit(1)
      imWidth, imHeight = im.size  # Window size is set to image size
      wWidth, wHeight = im.size
      im.draft("L", im.size)  # L-flag is for Luminance
      pixels = np.fromstring(
          im.tostring(), dtype=np.uint8
      )  # Got the array
      pixels.resize((imHeight, imWidth))  # Resize to 2d array
      print("Reading image:", fn, "size:", imWidth, "x", imHeight)
  
imports: from OpenGL.GL import *
  from OpenGL.GLUT import *
  from OpenGL.GLU import *
  from OpenGL.GL.ARB.vertex_buffer_object import *
  import numpy, Image
  import sys, time, os
  import pycuda.driver
  import pycuda.gl
  import pycuda
  from pycuda.compiler import SourceModule
label_desc: Use image node_id 5 for calling a global function with example usage: loadImage(fn) without return types