ValueError Image has wrong mode when accessing renditions of this particular image.

[salty-ivy]

Description

On a successful upload of this image, it bypasses the image rendition generation.

and on web when trying to access this via CMS admin we get a ValueError and image has wrong mode down from willow/pillow as wagtail tries to regenerate the renditions if not found.

after deleting the wagtail.images.Image instance and corresponding renditions it seems to work.

the Image

Ideas and thoughts

Whole page /admin/images/ becomes inaccessible which is a big issues cause there's no warning at the time of upload.

May be wagtail/willow should throw some error/warning or reject the upload if renditions don't get generated on upload?

[Stormheg]

I tried uploading this file and can confirm I'm seeing the same error (Willow==1.8.0 and wagtail==6.2.1)

[Stormheg]

I've investigated and this is an issue upstream in Pillow 10.3.0. There is an issue open about it already and I've commented on it with my findings here: python-pillow/Pillow#8333 (comment)

Let's wait and see what happens.

---

As a workaround you can install Pillow==10.2.0 in the mean time.

[salty-ivy]

@Stormheg thanks!

[Stormheg]

The issue is fixed in Pillow 11.0, which is not currently supported by Willow. I created #158 for that.

I suggest we keep this open until #158 is merged and released.

[zerolab]

https://github.com/wagtail/Willow/releases/tag/v1.9.0 is now out, so closing this