exif_transpose raises TypeError: object of type 'IFDRational' has no len()

[dkbarn]

What did you do?

Ran ImageOps.exif_transpose on this image: https://i1.sndcdn.com/avatars-000133622422-vmk8sz-original.jpg

What did you expect to happen?

The image to be transposed

What actually happened?

A TypeError exception was raised:

Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "/share/venv-pillow/lib/python3.10/site-packages/PIL/ImageOps.py", line 641, in exif_transpose
    exif_image.info["exif"] = exif.tobytes()
  File "/share/venv-pillow/lib/python3.10/site-packages/PIL/Image.py", line 3798, in tobytes
    return b"Exif\x00\x00" + head + ifd.tobytes(offset)
  File "/share/venv-pillow/lib/python3.10/site-packages/PIL/TiffImagePlugin.py", line 898, in tobytes
    data = ifd.tobytes(offset)
  File "/share/venv-pillow/lib/python3.10/site-packages/PIL/TiffImagePlugin.py", line 898, in tobytes
    data = ifd.tobytes(offset)
  File "/share/venv-pillow/lib/python3.10/site-packages/PIL/TiffImagePlugin.py", line 907, in tobytes
    "<table: %d bytes>" % len(data) if len(data) >= 16 else str(values)
TypeError: object of type 'IFDRational' has no len()

What are your OS, Python and Pillow versions?

• OS: Ubuntu 22.04.3
• Python: 3.10.12
• Pillow: 10.2.0

import io
from PIL import Image, ImageOps
import requests

response = requests.get("https://i1.sndcdn.com/avatars-000133622422-vmk8sz-original.jpg")
image = Image.open(io.BytesIO(response.content))
ImageOps.exif_transpose(image)

[radarhere]

The problem is the InteropVersion tag. It should have an undefined type, and looking through our test images, it is b'0100' in them.

In your image though, it is 3 rationals. Pillow tries to save it back as undefined, and fails to handle that.

I've created #7840 to resolve this.