How to save image to database after resizing it on Django?

Question

I'm trying to resize a file while the image is uploaded, but I'm have some issue trying to save it into my model's ImageField.

Here is my models.py :

try:
    from PIL import Image, ImageOps
except ImportError:
    import Image
    import ImageOps

class IMGResize(models.Model):
    image = models.ImageField(upload_to='images', blank=True)

    def save(self, *args, **kwargs):
        if self.image:
            img = Image.open(self.image) #<PIL.JpegImagePlugin.JpegImageFile image mode=RGB size=980x490 at 0x59E4B38>

            imageresize = img.resize((200, 200), Image.ANTIALIAS) #<PIL.Image.Image image mode=RGB size=200x200 at 0x4D5F630>
            imageresize.save('newname.jpg', 'JPEG', quality=75) #not being saved here to my models
        super(IMGResize, self).save(*args, **kwargs)

How can I resolve this so I can save the resized image into my model ?

Community · Accepted Answer · 2017-05-23 11:54:16Z

2

I found the answer on this post by madzohana, which works without any issue.

from PIL import Image
from io import BytesIO
from django.core.files.base import ContentFile

def save(self, *args, **kwargs):
    img = Image.open(self.image)
    resized  = img.resize((200, 200), Image.ANTIALIAS)
    new_image_io = BytesIO()

    if img.format == 'JPEG' :
        resized .save(new_image_io, format='JPEG')
    elif img.format == 'PNG' :
        resized.save(new_image_io, format='PNG')

    temp_name = self.image.name
    self.image.delete(save=False)

    self.image.save(
        temp_name,
        content=ContentFile(new_image_io.getvalue()),
        save=False
    )

    super(IMGResize, self).save(*args, **kwargs)

edited May 23, 2017 at 11:54

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answered Apr 13, 2017 at 20:51

Horai Nuri

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1 Comment

Kanin Peanviriyakulkit Over a year ago

This work, But it alway run resize function every time I update form but not insert new image.

dentemm · Accepted Answer · 2017-04-13 19:35:17Z

1

I believe this will do the trick (edited for PIL Image objects:

from django.core.files.base import ContentFile
import StringIO

....

class IMGResize(models.Model):
    image = models.ImageField(upload_to='images', blank=True)

    def safe(self, *args, **kwargs):
        if self.image:
            img = Image.open(self.image)
            imageresize = img.resize((200, 200), Image.ANTIALIAS)

            image_formatted = Image.open(StringIO(imageresize.content))
            image_io = StringIO()

            image_formatted.save(image_io, format='JPEG')


            self.image.save(self.image.name, ContentFile(image_io.getvalue(), True)

            super(IMGResize, self).save(*args, **kwargs)

edited Apr 13, 2017 at 19:35

answered Apr 13, 2017 at 19:19

dentemm

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10 Comments

Horai Nuri Over a year ago

It gives me this error : 'Image' object has no attribute 'read'

dentemm Over a year ago

Ah yes you are using a PIL image, wait a minute let me find the correct way for PIL images

Horai Nuri Over a year ago

I'm interested by the PIL answer, but also with this one, what "Image" library does it use ?

Horai Nuri Over a year ago

I tried with StringIO once, but it seems like it is compatible with python 3, the problem is that I didn't knew how i could adapt io to work on with the img resize app

dentemm Over a year ago

I think this should be about right, but it might be possible in a shorter way. My previous example was using sorl.thumbnail for resizing

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