Pillow: TypeError on ImageOps.exif_transpose(image)

[czrcbl]

What did you do?

I was trying to process a dataset on the Detectron2 framework.

What did you expect to happen?

I expected the code to run with no exception.

What actually happened?

TypeError: object of type 'int' has no len()

Here the complete stacktrace:

/home/cezar/Programs/anaconda3/envs/detectron/lib/python3.7/site-packages/PIL/TiffImagePlugin.py:603: UserWarning: Metadata Warning, tag 282 had too many entries: 2, expected 1
  % (tag, len(values))
/home/cezar/Programs/anaconda3/envs/detectron/lib/python3.7/site-packages/PIL/TiffImagePlugin.py:603: UserWarning: Metadata Warning, tag 283 had too many entries: 2, expected 1
  % (tag, len(values))
/home/cezar/Programs/anaconda3/envs/detectron/lib/python3.7/site-packages/PIL/TiffImagePlugin.py:603: UserWarning: Metadata Warning, tag 34853 had too many entries: 9, expected 1
  % (tag, len(values))
Traceback (most recent call last):
  File "test.py", line 21, in <module>
    image = ImageOps.exif_transpose(image)
  File "/home/cezar/Programs/anaconda3/envs/detectron/lib/python3.7/site-packages/PIL/ImageOps.py", line 549, in exif_transpose
    transposed_image.info["exif"] = exif.tobytes()
  File "/home/cezar/Programs/anaconda3/envs/detectron/lib/python3.7/site-packages/PIL/Image.py", line 3213, in tobytes
    return b"Exif\x00\x00" + head + ifd.tobytes(offset)
  File "/home/cezar/Programs/anaconda3/envs/detectron/lib/python3.7/site-packages/PIL/TiffImagePlugin.py", line 837, in tobytes
    count = len(data)
TypeError: object of type 'int' has no len()

What are your OS, Python and Pillow versions?

• OS: Ubuntu 19.10
• Python: 3.7.5
• Pillow: 6.2.1

from PIL import Image, ImageOps
file_name = 'path/to/image/pt59.png'

with open(file_name, "rb") as f:
    image = Image.open(f)
    image = ImageOps.exif_transpose(image)

Here the link to the file:
https://www.dropbox.com/s/z5tc5zddqw20n15/pt59.zip?dl=0
This problem happened to 3 files from the whole dataset, since the images were proprocessed by the same script and taken from the same camera, I don't understand what might be wrong, or if it is a problem on the image or on the PIL library itself.

[radarhere]

4009 helps by changing this error to struct.error: argument out of range.

3980 will fix that remaining error.

[Mapiarz]

Hi! Any ETA on when this makes a release? I'm encountering the very same issue and it's blocking me from releasing to production. Thanks!

[hugovk]

Pillow releases quarterly, the next one is due 2020-01-01: https://github.com/python-pillow/Pillow/issues/4210.

[radarhere]

3980 has been merged, so this is now resolved. The fix will be available as part of Pillow 7.0

[rodrigoruiz]

I'm still having the same error on Pillow 7.0.0.

The UserWarning: Metadata Warning, tag 282 had too many entries: 2, expected 1 I mean

[radarhere]

@rodrigoruiz do you have an image to demonstrate the warnings, that could be added to the test suite under the Pillow license?

[radarhere]

@rodrigoruiz the warning on tag 282 should now be fixed in Pillow master, and will be part of the next Pillow release, due out on July 1.

[amiantos]

Did this fix make it into Pillow 7.2.0? It was released June 30, not July 1, so not sure... I've attached a good test photo that triggers the error for me in pillow-simd 7.0.0

White dog looking at camera.jpg.zip

For people who land here and are using pillow-simd, the code in this PR is a solid workaround for this issue if you want to continue to use pillow-simd: https://github.com/facebookresearch/detectron2/pull/1666

[hugovk]

Yep, https://github.com/python-pillow/Pillow/pull/4637 was merged on June 10 so made it into 7.2.0.