code: def test_mode_F():
      im = get_image("F")
      for factor in remarkable_factors:
          compare_reduce_with_reference(im, factor, 0, 0)
          compare_reduce_with_box(im, factor)
  
file_path: pillow-simd/Tests/test_image_reduce.py
imports: import pytest
  from PIL import Image, ImageMath, ImageMode
  from .helper import convert_to_comparable, skip_unless_feature
label_desc: Use image node_id 15 for calling a global function with example usage: test_mode_F() without return types