utils.py

def image_to_byte_array(image: Image) -> bytes:
    # BytesIO is a fake file stored in memory
    imgByteArr = io.BytesIO()
    # image.save expects a file as a argument, passing a bytes io ins
    image.save(imgByteArr, format='png')  # image.format
    # Turn the BytesIO object back into a bytes object
    imgByteArr = imgByteArr.getvalue()
    return imgByteArr