code: def write_png(filename, image):
      """image must be numpy array H X W X channels"""
      import zlib, struct
  
      buf = image.flatten().tobytes()
      width = image.shape[1]
      height = image.shape[0]
  
      # reverse the vertical line order and add null bytes at the start
      width_byte_4 = width * 4
      raw_data = b"".join(
          b"\x00" + buf[span : span + width_byte_4]
          for span in range(
              (height - 1) * width_byte_4, -1, -width_byte_4
          )
      )
  
      def png_pack(png_tag, data):
          chunk_head = png_tag + data
          return (
              struct.pack("!I", len(data))
              + chunk_head
              + struct.pack("!I", 0xFFFFFFFF & zlib.crc32(chunk_head))
          )
  
      png_bytes = b"".join(
          [
              b"\x89PNG\r\n\x1a\n",
              png_pack(
                  b"IHDR",
                  struct.pack("!2I5B", width, height, 8, 6, 0, 0, 0),
              ),
              png_pack(b"IDAT", zlib.compress(raw_data, 9)),
              png_pack(b"IEND", b""),
          ]
      )
  
      write_file(filename, png_bytes)
  
imports: import numpy
  import math
  import time
  import sys
  import os
  import inspect
  import re
  import uuid
  from collections import abc
  import textwrap
  from functools import wraps
  import gc
  import timeit
label_desc: Use image node_id 23 for calling a global function with example usage: write_png(filename, image) and returns: unknown