ImageOps.exif_transpose not expected behaviour for TIFF images

[bsekachev]

What did you do?

I have a simple tiff image 150x100px rotated 90 degrees according to exif tag:

sample-out.zip

exiftool -n sample-out.tif
...
Image Width                     : 150
Image Height                    : 100
Orientation                     : 6
...

I tried to rotate the image in Pillow according to EXIF Orientation tag.

What did you expect to happen?

New resolution is 100x150, correct orientation

What actually happened?

New resolution is 150x100, image transposed wrong way

What are your OS, Python and Pillow versions?

• OS: Ubuntu
• Python: 3.10
• Pillow: 9.3.0

from PIL import Image, ImageOps
im = Image.open('sample-out.tif') 
print(im.size) # (150, 100) - correct
im = ImageOps.exif_transpose(im)
print(im.size) # (150, 100) - not correct
im.save('output.tif') # you may save and see that now image rotated 540 degrees and does not contain

exiftool -n output.tif
...
Image Width                     : 150
Image Height                    : 100
# there is not Orientation tag anymore
...

Reason

Image.transpose calls Image.load().
Image.load()calls TiffImageFile.load()
TiffImageFile.load() calls ImageFile.load()
ImageFile.load() calls TiffImageFile.load_end()
load_end() transposes image.

After Image.load() is done, image is transposed again.

[radarhere]

I've created PR #7383 to resolve this.

[bsekachev]

@radarhere

Thanks for a quick response :)