I have been migrating away from https://github.com/ciotto/pyheif-pillow-opener and got an error that .heic extension was not supported. After looking into it, it seems pillow-opener registered the extensions. I think it would be good to add it to this plugin as well:

https://github.com/ciotto/pyheif-pillow-opener/blob/5cf38718bcfb07edb9ac56e0a6dc13ff7b4e9830/pyheif_pillow_opener/__init__.py#L84-L88

Image.register_extensions(HeifImageFile.format, ['.heic', '.heif'])

Describe the bug

Does not work with Pillow 10.1. The attribute ImageFile.mode can no longer be set directly.

This is the same issue as: imageio/imageio#1044

I can get it work by monkeypatching the HeifImageFile._open function, changing the line:

self.mode = heif_file.mode

to

self._mode = heif_file.mode

but would be good to have a proper fix.

Steps to reproduce

import HeifImagePlugin
from PIL import Image, ImageOps

with Image.open('some-heic-file.heic') as image:
    # raises exception here

Code / screenshots

  File "/opt/venvs/python/lib/python3.11/site-packages/PIL/Image.py", line 3284, in open
    im = _open_core(fp, filename, prefix, formats)
         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/opt/venvs/python/lib/python3.11/site-packages/PIL/Image.py", line 3270, in _open_core
    im = factory(fp, filename)
         ^^^^^^^^^^^^^^^^^^^^^
  File "/opt/venvs/python/lib/python3.11/site-packages/PIL/ImageFile.py", line 117, in __init__
    self._open()
  File "/opt/venvs/python/lib/python3.11/site-packages/HeifImagePlugin.py", line 117, in _open
    self.mode = heif_file.mode
    ^^^^^^^^^
AttributeError: property 'mode' of 'HeifImageFile' object has no setter

Environment

• Library version: heif-image-plugin==0.6.0
• Language/framework version: Python 3.11.5
• OS version: CentOS 7.9

Describe the bug

using the plugin with Pillow (used by sigal, static image gallery generator ) it crashes:

Collecting albums, done.
Sorting albums [####################################] 100%
Sorting media [####################################] 100%
Collecting files [####################################] 100%
Processing files [------------------------------------] 0/2
Traceback (most recent call last):
File "/home/simon/python_virt_sigal/env/bin/sigal", line 8, in
sys.exit(main())
File "/home/simon/python_virt_sigal/env/lib/python3.9/site-packages/click/core.py", line 1128, in call
return self.main(*args, **kwargs)
File "/home/simon/python_virt_sigal/env/lib/python3.9/site-packages/click/core.py", line 1053, in main
rv = self.invoke(ctx)
File "/home/simon/python_virt_sigal/env/lib/python3.9/site-packages/click/core.py", line 1659, in invoke
return _process_result(sub_ctx.command.invoke(sub_ctx))
File "/home/simon/python_virt_sigal/env/lib/python3.9/site-packages/click/core.py", line 1395, in invoke
return ctx.invoke(self.callback, **ctx.params)
File "/home/simon/python_virt_sigal/env/lib/python3.9/site-packages/click/core.py", line 754, in invoke
return __callback(*args, **kwargs)
File "/home/simon/python_virt_sigal/env/lib/python3.9/site-packages/sigal/init.py", line 157, in build
gal.build(force=force)
File "/home/simon/python_virt_sigal/env/lib/python3.9/site-packages/sigal/gallery.py", line 756, in build
for status in self.pool.imap_unordered(worker, media_list):
File "/usr/lib/python3.9/multiprocessing/pool.py", line 870, in next
raise value
File "/usr/lib/python3.9/multiprocessing/pool.py", line 537, in _handle_tasks
put(task)
File "/usr/lib/python3.9/multiprocessing/connection.py", line 211, in send
self._send_bytes(_ForkingPickler.dumps(obj))
File "/usr/lib/python3.9/multiprocessing/reduction.py", line 51, in dumps
cls(buf, protocol).dump(obj)
TypeError: cannot pickle 'module' object

i do generate image gallery with sigal, which uses Pillow

i do generate image gallery with sigal, which uses Pillow

Expected behavior

Pillow can handle heif images with this plugin and the gallery generates

Code / screenshots

Environment

• Library version:
• Language/framework version:
• OS version: