How to resize the new uploaded images using PIL before saving?

Question

I want to resize the new images in a height and width of 800px and save them. And the app mustn\'t store the real image. Any help?

This is my code, it saves the orig

Answer 1

here is what worked for me, inspired a little from django-resized

@receiver(pre_save, sender=MyUser)
@receiver(pre_save, sender=Gruppo)
def ridimensiona_immagine(sender, instance=None, created=False, **kwargs):
    foto = instance.foto

    foto.file.seek(0)
    thumb = PIL.Image.open(foto.file)
    thumb.thumbnail((
        200, 
        200
        ), PIL.Image.ANTIALIAS)


    buffer = StringIO.StringIO()
    thumb.save(buffer, "PNG")
    image_file = InMemoryUploadedFile(buffer, None, 'test.png', 'image/png', buffer.len, None)

    instance.foto.file = image_file