code: def test_quantize():
      with Image.open("Tests/images/caption_6_33_22.png") as image:
          image = image.convert("RGB")
      converted = image.quantize()
      assert converted.mode == "P"
      assert_image_similar(converted.convert("RGB"), image, 1)
  
file_path: pillow/Tests/test_image_quantize.py
imports: from __future__ import annotations
  import pytest
  from packaging.version import parse
  from PIL import Image, features
  from .helper import assert_image_similar, hopper, is_ppc64le, skip_unless_feature
label_desc: Use image node_id 5 for calling a global function with example usage: test_quantize() without return types