TIFF EXIF data is not updated when saving image

[gverm]

What did you do?

Tried to add 'Artist' and 'Copyright' exif fields to artwork.tiff

What did you expect to happen?

Exif to be saved and viewable for artwork.tiff.

What actually happened?

Exif data was not updated and loading the image with Pillow again also didn't show the updated data.

What are your OS, Python and Pillow versions?

• OS: Linux
• Python: 3.10.4
• Pillow: 9.1.1

img = Image.open("artwork.tiff")
exif = img.getexif()
exif[0x8298] = "test"
exif[0x013B] = "test"
img.save("artwork.tiff", exif=exif)

artwork.zip
The tiff in the zip above was created by converting the svg I will attach below using ImageMagick.
artwork-00.svg

Pillow saved the image successfully, no failure messages were shown.

[radarhere]

Hi. If you'd like an immediate workaround, adding in img.load() saves the data correctly.

from PIL import Image
img = Image.open("artwork.tiff")
exif = img.getexif()
img.load()
exif[0x8298] = "test"
exif[0x013B] = "test"
img.save("artwork.tiff", exif=exif)

[radarhere]

I've created PR #6335 to resolve this.

[gverm]

@radarhere Thank you for the very fast response. I can confirm your workaround works.