Add metadata png PIL

from PIL.PngImagePlugin import PngImageFile, PngInfo

targetImage = PngImageFile("pathToImage.png")

metadata = PngInfo()
metadata.add_text("MyNewString", "A string")
metadata.add_text("MyNewInt", str(1234))

targetImage.save("NewPath.png", pnginfo=metadata)
targetImage = PngImageFile("NewPath.png")

print(targetImage.text)

>>> {'MyNewString': 'A string', 'MyNewInt': '1234'}

Source: stackoverflow.com

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