TypeError on getexif().tobytes()

[deepio]

What did you do?

Saved a tiff with same exif.

What did you expect to happen?

saved file

What actually happened?

Traceback (most recent call last):
  File "/Users/deepio/Desktop/test/ape.py", line 4, in <module>
    im.save("testing.tiff", format=im.format, exif=im.getexif().tobytes())
  File "/Users/deepio/.pyenv/versions/3.9.13/lib/python3.9/site-packages/PIL/Image.py", line 2353, in save
    save_handler(self, fp, filename)
  File "/Users/deepio/.pyenv/versions/3.9.13/lib/python3.9/site-packages/PIL/JpegImagePlugin.py", line 747, in _save
    exif = exif.tobytes()
  File "/Users/deepio/.pyenv/versions/3.9.13/lib/python3.9/site-packages/PIL/Image.py", line 3628, in tobytes
    return b"Exif\x00\x00" + head + ifd.tobytes(offset)
  File "/Users/deepio/.pyenv/versions/3.9.13/lib/python3.9/site-packages/PIL/TiffImagePlugin.py", line 878, in tobytes
    data = ifd.tobytes(offset)
  File "/Users/deepio/.pyenv/versions/3.9.13/lib/python3.9/site-packages/PIL/TiffImagePlugin.py", line 887, in tobytes
    "<table: %d bytes>" % len(data) if len(data) >= 16 else str(values)
TypeError: object of type 'int' has no len()

So I traced it:

> /Users/deepio/Desktop/ape.py(11)go()
-> print(im.getexif().tobytes())
(Pdb) b /Users/deepio/.pyenv/versions/3.9.1/lib/python3.9/site-packages/PIL/TiffImagePlugin.py:864
Breakpoint 1 at /Users/deepio/.pyenv/versions/3.9.1/lib/python3.9/site-packages/PIL/TiffImagePlugin.py:864
(Pdb) condition 1 tag==5
New condition set for breakpoint 1.
(Pdb) commands 1
(com) print(f"tag: {tag}\nvalue: {value}")
(com) end
(Pdb) c
tag: 5
value: 0
> /Users/deepio/.pyenv/versions/3.9.1/lib/python3.9/site-packages/PIL/TiffImagePlugin.py(864)tobytes()
-> if tag == STRIPOFFSETS:

(Pdb) is_ifd
False
(Pdb) values = value if isinstance(value, tuple) else (value,)
(Pdb) values
(0,)
(Pdb) self._write_dispatch[typ](self, *values)
0

<same traceback as above>

So a possible fix could be to do the same isinstance on data as it is done on values above it.

What are your OS, Python and Pillow versions?

• OS: recreated on MacOS 12.5.1 / Ubuntu 18.04
• Python: (3.9.1/3.9.13)/3.9.9
• Pillow: 9.3.0

from PIL import Image

im = Image.open("38bfc38a_a51a_c735def5ae62.tiff")
# saving is not required to trigger the same failure.
im.getexif().tobytes()

[deepio]

Possibly a type of regression with #1524 but it's not with saving

[radarhere]

Would you be able to upload a copy of the image?

[deepio]

Here we go:

[radarhere]

Thanks. I've created PR #6740 to resolve this.

[huynd26]

seem the error still appears although I updated to version 9.3.0

    transposed_image.info["exif"] = transposed_exif.tobytes()
  File "PIL/Image.py", line 3628, in tobytes
    return b"Exif\x00\x00" + head + ifd.tobytes(offset)
  File "PIL/TiffImagePlugin.py", line 878, in tobytes
    data = ifd.tobytes(offset)
  File "PIL/TiffImagePlugin.py", line 887, in tobytes
    "<table: %d bytes>" % len(data) if len(data) >= 16 else str(values)

[radarhere]

PR #6740 will be part of Pillow 9.4.0, due out on January 2.

If you do have the same error, it should be fixed then.

[huynd26]

Thank you, expect to be released soon

[radarhere]

Pillow 9.4.0 has now been released.