How can I resize an image file uploaded with Django using an ImageField Model?

Question

What is the most straightforward method to resize an image file uploaded via a Django form as an ImageField?

Use PIL for the job: http://stackoverflow.com/questions/273946/how-do-i-resize-an-image-using-pil-and-maintain-its-aspect-ratio — Krzysztof Szularz, Mar 20 '13 at 09:34
you need to use an external library or an app to achieve that as django does not have any pre-defined methods for what you are looking to do. — Amyth, Mar 20 '13 at 11:38
Is there any way to re-open this closed question so that I can share my modern solution? (Django 2.0 and Python3.6). — Nostalg.io, Jun 11 '18 at 20:08

Ivan Š · Accepted Answer · 2014-02-18T00:04:50.907

I was annoyed that I couldn't find a complete working example, only bits here and there. I managed to put the solution together myself. Here is the complete example, I put it in clean() method of the form (you can also override models save() method, in the completely same way - changing ImageField's file property).

import StringIO
from PIL import Image

image_field = self.cleaned_data.get('image_field')
image_file = StringIO.StringIO(image_field.read())
image = Image.open(image_file)
w, h = image.size

image = image.resize((w/2, h/2), Image.ANTIALIAS)

image_file = StringIO.StringIO()
image.save(image_file, 'JPEG', quality=90)

image_field.file = image_file

Thanks for this example but I don't understand everything... What is "info" ? Otherwise, in python 3.x it's io.StringIO(...) — HydrUra, Sep 27 '13 at 10:15

score 7 · Answer 2 · edited May 23 '17 at 12:34

7

You could use PIL and resize the image in YourModel.save() method.

Examples:

resize image on save

http://djangosaur.tumblr.com/post/422589280/django-resize-thumbnail-image-pil

http://davedash.com/2009/02/21/resizing-image-on-upload-in-django/

edited May 23 '17 at 12:34

Community

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answered Mar 20 '13 at 09:33

Efrin

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Do you have a code example? – Ivan Š Mar 20 '13 at 09:36
Yeah, added in my post :) – Efrin Mar 20 '13 at 09:50
+1 for suggesting PIL – Amyth Mar 20 '13 at 11:36
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Not a single link is a complete example for my use case, I had problems integrating the code in my previous attempts. – Ivan Š Mar 20 '13 at 12:23
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This answer would be better with code examples in the answer and not just links to other websites that may be down at the time you try to click the link. – teewuane Jul 13 '15 at 21:06

How can I resize an image file uploaded with Django using an ImageField Model?

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