code: def netpbm_available():
      return bool(shutil.which("ppmquant") and shutil.which("ppmtogif"))
  
imports: import logging
  import os
  import shutil
  import sys
  import sysconfig
  import tempfile
  from io import BytesIO
  import pytest
  from packaging.version import parse
  from PIL import Image, ImageMath, features
label_desc: Use image node_id 19 for calling a global function with example usage: netpbm_available() and returns: bool