code: def brightness_list(var, images):
      """
      Perform color brightness on the given list of images.
      Args:
          var (float): variance.
          images (list): list of images to perform color brightness.
      Returns:
          (array): list of images that performed color brightness.
      """
      alpha = 1.0 + np.random.uniform(-var, var)
  
      out_images = []
      for image in images:
          img_bright = np.zeros(image.shape).astype(image.dtype)
          out_images.append(blend(image, img_bright, alpha))
      return out_images
  
imports: import math
  import numpy
  import cv2
label_desc: Use image node_id 29 for calling a global function with example usage: brightness_list(var, images) and returns: out_images