code: def roundtrip(im, **options):
      out = BytesIO()
      im.save(out, "PNG", **options)
      out.seek(0)
      return Image.open(out)
  
imports: import re
  import sys
  import zlib
  from io import BytesIO
  import pytest
  from PIL import Image, ImageFile, PngImagePlugin, features
  from .helper import PillowLeakTestCase, assert_image, assert_image_equal, assert_image_equal_tofile, hopper, is_win32, mark_if_feature_version, skip_unless_feature
label_desc: Use image node_id 3 for calling a global function with example usage: roundtrip(im) and returns: Image