Division by zero error when using ImageOps.exif_transpose since Pillow 11.0

[fabienarnaud]

Hi,

Some jpg images are returning a "division by zero" error since the Pillow version 11.0 was released when using the ImageOps.exif_transpose() function.

Below is for example 1 of these images with its exif information, using Pillow version 10.4:

The same image and code, now with Pillow 11.0.0:

Some more error details:

[radarhere]

Hi. If you would like to attach an image, then we could test it and know exactly what the problem is - or at the very least, could we have the EXIF data provided in text format here, rather than a screenshot of the EXIF data?

Apart from that, this sounds like a duplicate of #8471.

#8474 has already been merged to resolve this in main.

[fabienarnaud]

Thank you for your outstanding reactivity!
Sure, here is the EXIF data in text:
{296: 2, 282: 72.0, 256: 4096, 257: 3072, 270: '\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00', 271: 'samsung\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00', 272: 'SM-A022F\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00', 274: 6, 531: 2, 283: 72.0, 544: 0, 545: 0, 546: 0, 547: 0, 548: 0, 549: '\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00', 34853: 952, 34665: 450, 305: 'A022FXXS3BWH1\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00', 306: '2024:10:15 14:35:26'}

And here is the image leading to the division by zero:

[radarhere]

Thanks. Yes, this has been fixed in main already.

If you would like to patch your code so that it works for the moment, you could do the following -

from PIL import Image, ImageOps, TiffImagePlugin

# Patch
def _limit_rational(val, max_val):
    inv = abs(val) > 1
    n_d = TiffImagePlugin.IFDRational(1 / val if inv else val).limit_rational(max_val)
    return n_d[::-1] if inv else n_d
TiffImagePlugin._limit_rational = _limit_rational

with Image.open('in.jpg') as im:
    ImageOps.exif_transpose(im)

[fabienarnaud]

Happy to hear that! And thank you for the patch!

[radarhere]

Pillow 11.1.0 has now been released with the fix for this.

[fabienarnaud]

Brilliant! Thank you so much for your support!