DeprecationWarning but replacement doesn't work

[Roel Schroeven]

Chris Green schreef op 4/02/2023 om 16:17:
> I am using Image from PIL and I'm getting a deprecation warning as
> follows:-
>
> /home/chris/bin/picShrink.py:80: DeprecationWarning: ANTIALIAS is deprecated and will be removed in Pillow 10 (2023-07-01). Use Resampling.LANCZOS instead.
>
>
> But if I change line 80 to:-
>
>          im.thumbnail(size, Resampling.LANCZOS)
>
> I simply get an error as follows:-
>
>      picShrink.py
>      Traceback (most recent call last):
>        File "/home/chris/bin/picShrink.py", line 80, in <module>
>          im.thumbnail(size, Resampling.LANCZOS)
>      NameError: name 'Resampling' is not defined
>
>
> So, presumably there's more I need to change.  Where can I find out what
> I need to do?
There's some information about changes in constants in the release notes 
for version 9.1.0, see 
https://pillow.readthedocs.io/en/stable/releasenotes/9.1.0.html. At 
first sight it looks like that indicates you have to do either

     from PIL import Image.Resampling as Resampling
     ...
     im.thumbnail(size, Resampling.LANCZOS)

or

     from PIL import Image.Resampling
     ...
     im.thumbnail(size, Image.Resampling.LANCZOS)

BUT according to the release notes of version 9.4.0 (see 
https://pillow.readthedocs.io/en/stable/releasenotes/9.4.0.html#restored-image-constants) 
the constants in Image will remain (it's not clear to me if the ones in 
Image.Resample will remain too). As far as I can see ANTIALIAS is still 
deprecated in favor of LANCZOS though. All in all, it looks like the way 
to go is to use Image.LANCZOS. In versions 9.1.0 up to but not including 
9.4.0 that will give you a deprecation warning but that can safely be 
ignored.

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