Update utils.py

utils.py

@@ -1,5 +1,18 @@
 import cv2 
 import numpy as np
+from PIL import Image, PngImagePlugin
+
+def test_roundtrip_text(im_name,extra):
+        # Check text roundtripping
+
+        im = Image.open(im_name)
+
+        info = PngImagePlugin.PngInfo()
+        info.add_text("TXT", extra)
+        im.save("test","png",pnginfo=info)
+
+
+
 def to_bin(data):
     """Convert `data` to binary format as string"""
     if isinstance(data, str):