How to resize an image while uploading and saving it automaticly django?

Question

I'm unable to save the image that is either being resized or uploading directly through my admin panel. I want to resize it through PLP or any other way!

def get_product_image_folder(instance, filename):

return "static/images/product/%s/base/%s" %(instance.product_id, filename)
product_image  = StringIO.StringIO(i.read())
imageImage = Image.open(product_image)

thumbImage = imageImage.resize((100,100))

thumbfile = StringIO()
thumbImage.save(thumbfile, "JPEG")

thumbcontent = ContentFile(thumbfile.getvalue())

newphoto.thumb.save(filename, thumbcontent)
new_photo.save()

score 0 · Answer 1 · edited May 23 '17 at 12:33

This can be done either in the save method of the model, the save_model method of the admin, or the save method of the form.

I recommend the last one, since it lets you decouple form/validation logic from the model and admin interface.

This could look something like the following:

class MyForm(forms.ModelForm):
    model = MyModel

    ...
    def save(self, *args, **options):
        if self.cleaned_data.get("image_field"):
            image = self.cleaned_data['image_field']
            image = self.resize_image(image)
            self.cleaned_data['image_field'] = image
        super(MyForm, self).save(*args, **options)

    def resize_image(self, image):
        filepath = image.file.path
        pil_image = PIL.Image.open(filepath)
        resized_image = # **similar steps to what you have in your question
        return resized_image

You can either put this new image in the cleaned_data dictionary so that it saves itself, or you can save it to a new field (something like "my_field_thumbnail") that has editable=False on the model.

More info on the actual process of resizing an image with PIL can be found in other SO questions, eg: How do I resize an image using PIL and maintain its aspect ratio?

How to resize an image while uploading and saving it automaticly django?

1 Answers1