DeprecationWarning but replacement doesn't work

[Chris Green]

Roel Schroeven <roel at roelschroeven.net> wrote:
> 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.
> 
Thank you Roel (and Chris in the previous reply) for your helpful
explanations, it's all cleared up now.

-- 
Chris Green
·