QOI support

[Max1Truc]

What did you do?

Tried to open a QOI image ( https://qoiformat.org/ ) with Pillow (Image.open("picture.qoi"))

The picture is in this zip file (a 2-seconds stick-man) : picture.zip

What did you expect to happen?

I would love Pillow to recognize the file type and open the image.

What actually happened?

Pillow can't recognize the QOI format.

>>> from PIL import Image
>>> Image.open("picture.qoi")
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "/usr/lib/python3.10/site-packages/PIL/Image.py", line 3186, in open
    raise UnidentifiedImageError(
PIL.UnidentifiedImageError: cannot identify image file 'picture.qoi'

What are your OS, Python and Pillow versions?

• OS: Manjaro Linux
• Python: 3.10.8
• Pillow: 9.3.0

To replicate

from PIL import Image
Image.open("picture.qoi")

[Max1Truc]

I would be happy to contribute to Pillow by implementing QOI support btw (if in scope of pillow)

[radarhere]

Thanks for the test image, that was a helpful reference point.

I've created PR #6852 to add support for reading QOI images.

[Max1Truc]

Oh thanks, just had a look and this seems like a very clean implementation