code: def posterize(x, level):
      level = 1 + int(level * 7.999)
      return ImageOps.posterize(x, level)
  
imports: import random
  from collections import namedtuple
  import numpy
  from PIL import Image, ImageOps, ImageEnhance, ImageFilter
label_desc: Use image node_id 15 for calling a global function with example usage: posterize(x, level) and returns: ImageOps