On the fly image resize

Hi all,
I'm new to django and also python but have already some programming experience. I'm currently creating my first application in django and get stucked because I'm looking for the best way to resize uploaded images.
I'm already so far that I can upload/delete/update my images and show them in my view. Now I want to resize the images for my view and thought about the best way?

First question: Is it possible to resize the images on the fly? For example I uploaded an image in 1920x1080px and now want to transform it to 400x200 or something similar when the view is being loaded? Is this a convenient way in django or not?

The only other way in my opinion could be to resize the image during the file is being uploaded. What I don't like about this is that I have more than one copy of one image only because of different image sizes.

Any other thoughs?

I know that there are some nice packages out there where such problems are already solved. But since I'm new to django I want to learn by myself how to accomplish the basic stufff :)

Thanks in advance

Regards nymo

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