code: def test_autocontrast_cutoff():
      # Test the cutoff argument of autocontrast
      with Image.open("Tests/images/bw_gradient.png") as img:
  
          def autocontrast(cutoff):
              return ImageOps.autocontrast(img, cutoff).histogram()
  
          assert autocontrast(10) == autocontrast((10, 10))
          assert autocontrast(10) != autocontrast((1, 10))
  
imports: from __future__ import annotations
  import pytest
  from PIL import Image, ImageDraw, ImageOps, ImageStat, features
  from .helper import assert_image_equal, assert_image_similar, assert_image_similar_tofile, assert_tuple_approx_equal, hopper
label_desc: Use image node_id 19 for calling a global function with example usage: test_autocontrast_cutoff() and returns: ImageOps