docstr: png reading with itk, saving to nifti, then load with itk or nibabel or PIL
docstr_tok: ["png","reading","with","itk",",","saving","to","nifti",",","then","load","with","itk","or","nibabel","or","PIL"]
code: def test_png(self):
      """png reading with itk, saving to nifti, then load with itk or nibabel or PIL"""
  
      test_image = np.random.randint(0, 256, size=(256, 224, 3)).astype(
          "uint8"
      )
      with tempfile.TemporaryDirectory() as tempdir:
          filename = os.path.join(tempdir, "test_image.png")
          itk_np_view = itk.image_view_from_array(
              test_image, is_vector=True
          )
          itk.imwrite(itk_np_view, filename)
          output_name = "test_image/test_image_trans.png"
          self._cmp(
              filename,
              (3, 224, 256),
              "itkreader",
              "itkreader",
              output_name,
              ".png",
          )
          self._cmp(
              filename,
              (3, 224, 256),
              "itkreader",
              "PILReader",
              output_name,
              ".png",
          )
          self._cmp(
              filename,
              (3, 224, 256),
              "itkreader",
              "nibabelreader",
              output_name,
              ".png",
          )
  
imports: from __future__ import annotations
  import os
  import shutil
  import tempfile
  import unittest
  from pathlib import Path
  import nibabel
  import numpy
  import torch
  from parameterized import parameterized
  from monai.data import ITKReader
  from monai.data.meta_obj import set_track_meta
  from monai.data.meta_tensor import MetaTensor
  from monai.transforms import Compose, EnsureChannelFirstD, FromMetaTensord, LoadImaged, SaveImageD
  from monai.transforms.meta_utility.dictionary import ToMetaTensord
  from monai.utils import optional_import
  from tests.utils import assert_allclose
label_desc: Use image node_id 4 for calling the TestConsistency obj's underlying member method code with example usage: obj.test_png() without return types