code: def test_subtract_scale_offset():
      # Arrange
      with Image.open("Tests/images/imagedraw_chord_RGB.png") as im1:
          with Image.open(
              "Tests/images/imagedraw_outline_chord_RGB.png"
          ) as im2:
              # Act
              new = ImageChops.subtract(im1, im2, scale=2.5, offset=100)
  
      # Assert
      assert new.getbbox() == (0, 0, 100, 100)
      assert new.getpixel((50, 50)) == (100, 202, 100)
  
imports: from __future__ import annotations
  from PIL import Image, ImageChops
  from .helper import assert_image_equal, hopper
label_desc: Use image node_id 23 for calling a global function with example usage: test_subtract_scale_offset() without return types