Saving TIFF as JPEG fails with OSError: encoder error -2

[gverm]

What did you do?

Tried to convert TIFF to JPEG.

What did you expect to happen?

Converted image saved successfully.

What actually happened?

Bogus marker length
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "/home/gverm/Desktop/venv/lib/python3.10/site-packages/PIL/Image.py", line 2430, in save
    save_handler(self, fp, filename)
  File "/home/gverm/Desktop/venv/lib/python3.10/site-packages/PIL/JpegImagePlugin.py", line 803, in _save
    ImageFile._save(im, fp, [("jpeg", (0, 0) + im.size, 0, rawmode)], bufsize)
  File "/home/gverm/Desktop/venv/lib/python3.10/site-packages/PIL/ImageFile.py", line 517, in _save
    _encode_tile(im, fp, tile, bufsize, fh)
  File "/home/gverm/Desktop/venv/lib/python3.10/site-packages/PIL/ImageFile.py", line 547, in _encode_tile
    raise OSError(msg) from exc
OSError: encoder error -2 when writing image file

What are your OS, Python and Pillow versions?

• OS: EndeavourOS
• Python: 3.10 & 3.11
• Pillow: 9.4.0 & current git

from PIL import Image, ImageOps, TiffImagePlugin
src_img = Image.open("/home/gverm/ae213421281f00a1cbe6fa2a9eb9cea5-A65_02_048$02.tif")
exif = src_img.getexif()
del exif[TiffImagePlugin.STRIPOFFSETS]
dst_img = ImageOps.exif_transpose(src_img).convert("RGB")
dst_img.save("test.jpg", quality=95, exif=exif)

Link to image

[radarhere]

I find that if you add in

del exif[TiffImagePlugin.ICCPROFILE]

the error disappears.

[gverm]

@radarhere Is this something that is to be expected or is there actually a bug here?

[radarhere]

Without that workaround, the EXIF data you're trying to save is 417170 bytes long.

https://en.wikipedia.org/wiki/Exif

Exif metadata are restricted in size to 64 kB in JPEG images because according to the specification this information must be contained within a single JPEG APP1 segment.

So it is a restriction of the JPEG format.

[gverm]

Thanks for the explanation. Would it be possible to catch this case and display an error stating that this limitation has been hit?

[radarhere]

I've created PR #6939 to do so.

[fiksii-copilot]

Downgrade to 10.0.1 helped me