Asynchronous thumbnailing app in django with remote storages like S3. This is modifications of some parts of sorl-thumbnail, which is a bit slow when used with remote storages.

• Celery is used to create thumbnail asynchronously.
• Thumbnails are pregenerated and cached.
• Thumbnail sizes and options are specified in one place (your settings file).

pip install sorl-thumbnail-async

Add 'thumbnail' to your INSTALLED_APPS.

pip install django

pip install django-celery

pip install pillow

pip install sorl-thumbnail

In your settings.py add an option called THUMBNAIL_OPTIONS_DICT, defining all your thumbnail sizes:

THUMBNAIL_OPTIONS_DICT = {
        'small': {
                'geometry': '140x140',
                'crop': 'center'
        }
    }

In your models, use thumbnail.models.AsyncThumbnailMixin as a baseclass. Make sure that your model inherits from AsyncThumbnailMixin first. This will call celery task on save(), and create one or more thumbnails from the specified image field. Use class variable image_field_name to configure the field that contains the image. Defaults to picture.

Example:

from django.db import models

from sorl import thumbnail
from thumbnail.models import AsyncThumbnailMixin


class Book(AsyncThumbnailMixin, models.Model):
    image_field_name = 'cover_image'

	title = models.CharField(blank=False, max_length=255, db_index=True)
    cover_image = thumbnail.ImageField(upload_to='books/')

In templates:

{% load thumbnail_tags %}
{% thumbnail book.cover_image small as im %}
<img src"{{ im.url }}">
{% endthumbnail %}

In python code:

from thumbnail import get_thumbnail

book = Book.objects.get(title='Life of Pi')
thumbnail_url = get_thumbnail(book.cover_image, 'small').url

You can add as many sizes and option as needed. It is a python dictionary.

THUMBNAIL_OPTIONS_DICT = {
        'small': {
                'geometry': '140x140',
                'crop': 'center'
        }
    }

NOTE: sorl-thumbnail-async registers its own THUMBNAIL_BACKEND:

THUMBNAIL_BACKEND = 'sorl-thumbnail-async.thumbnail.backend.AsyncThumbnailBackend'