Thumbnails In Django

[divyanshi kathuria]

I am using Django Rest framework. I have three fields in my Pin Model : image,thumbnail_medium and thumbnail_small. I want to create two thumbnails from the image. How to do that? I tried the following code : But it's not working.
from django.db import models
from django.contrib.auth.models import User
from thumbs import ImageWithThumbsField
#from taggit.managers import TaggableManager
from PIL import Image
from cStringIO import StringIO
from django.core.files.uploadedfile import SimpleUploadedFile
import os


class Pin(models.Model):
   
    url = models.SlugField(blank=True, null=True)
    title = models.TextField(blank=False,null=False,default='Untitled')
    description = models.TextField(blank=True, null=True)
    is_pro = models.BooleanField(default=False)
    is_hidden = models.BooleanField(default=False)
    is_for_sale = models.BooleanField(default=False)
    is_pro = models.BooleanField(default=False)
    price = models.DecimalField(blank=True, null=True, max_digits=10, decimal_places=2 ,default=0)
    price_in_rs = models.BooleanField(default=False)
    size_in_inches = models.BooleanField(default=True)
    medium = models.TextField(blank=True, null=True)
    length = models.DecimalField(blank=True, null=True, max_digits=10, decimal_places=2 ,default=0)
    width = models.DecimalField(blank=True, null=True, max_digits=10, decimal_places=2 ,default=0)
    hearts = models.IntegerField(blank=True, null=True, default=0)
    image = models.ImageField(upload_to='pins/pin/originals/')
    thumbnail = models.ImageField(upload_to='pins/pin/thumbnails/')
    published = models.DateTimeField(auto_now_add=True)
    #tags = TaggableManager()

    def __unicode__(self):
        return self.url

    def save(self):
        from PIL import Image
        from cStringIO import StringIO
        from django.core.files.uploadedfile import SimpleUploadedFile

        # Set our max thumbnail size in a tuple (max width, max height)
        THUMBNAIL_SIZE = (50, 50)

        # Open original photo which we want to thumbnail using PIL's Image
        # object
        image = Image.open(self.image.name)

        # Convert to RGB if necessary
        # Thanks to Limodou on DjangoSnippets.org
        # http://www.djangosnippets.org/snippets/20/
        if image.mode not in ('L', 'RGB'):
            image = image.convert('RGB')

        # We use our PIL Image object to create the thumbnail, which already
        # has a thumbnail() convenience method that contrains proportions.
        # Additionally, we use Image.ANTIALIAS to make the image look better.
        # Without antialiasing the image pattern artifacts may result.
        image.thumbnail(THUMBNAIL_SIZE, Image.ANTIALIAS)

        # Save the thumbnail
        temp_handle = StringIO()
        image.save(temp_handle, 'png')
        temp_handle.seek(0)

        # Save to the thumbnail field
        suf = SimpleUploadedFile(os.path.split(self.image.name)[-1],
                temp_handle.read(), content_type='image/png')
        self.thumbnail.save(suf.name+'.png', suf, save=False)

        # Save this photo instance
        super(Pin, self).save()

Can anyone figure out the problem here? Why is it not creating thumbnails?

[Sadaf Noor]

In one of my projects I used sorl (https://github.com/mariocesar/sorl-thumbnail) instead, it was super easy and best fit for my project. Every time it asks for a new thumbnail BUT if it exists in its cache, then that one is returned. If it doesn't, a new one is generated and stored, then returned. So ultimately it saves. I don't know your use case. I am just saying it can be an option. 

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[Robin Lery]

Yes. I would like to add easy-thumbnails too. Both are great!

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[Ezequiel Bertti]

easy-thumbnails +1

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Cel: (21) 99188-4860

[divyanshi kathuria]

On Wednesday, July 22, 2015 at 3:12:47 AM UTC+5:30, Robin Lery wrote:

Yes. I would like to add easy-thumbnails too. Both are great!

I used easy-thumbnails. But it doesn't store the thumnails in my database.
I want three fields to get populated on loading the image : image, thumbnail_large,thumbnail_small. These apps just store the thumbnails in folders.

[Amitt Bhardwj]

Try Replacing thumbnails = ImageWithThumbsField(upload_to='your preferred location ', sizes=( your preferred size)
For second thumbnail use different size.
This might work

Amitt Bhardwj
Blog: amittbhardwj.wordpress.com
Github: https://github.com/amittbhardwj

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[Nkansah Rexford]

Might be unrelated to your specific problem, but generating thumbnails, I do mine in template directly, using ImageKit. Upon upload, I resize the image to a good size or convert the uploaded image to format of my taste, say 2048x1080.

Then in template, I just do {% thumbnail '400x500' model.image_field %} and the thumbnail is generated on the fly. The on-fly-generated-thumbnail is cached, so no performance issue is encountered upon second request.

https://github.com/matthewwithanm/django-imagekit

[Tao Huang]

I also came across some problems with sorl-thumbnail. It cannot generate "cache" folder and thumbnail_kvstore is always empty. Please see more detail in this question .