code: def serialize_image(self, image):
      s_px = image.load()
      return "\n".join(
          " ".join(f"{s_px[x, y]:02x}" for x in range(image.size[0]))
          for y in range(image.size[1])
      )
  
imports: from __future__ import annotations
  from contextlib import contextmanager
  import pytest
  from PIL import Image, ImageDraw
  from .helper import assert_image_equal, assert_image_similar, hopper, mark_if_feature_version
label_desc: Use image node_id 4 for calling the TestImagingCoreResampleAccuracy obj's underlying member method code with example usage: obj.serialize_image(image) and returns: str