Django / Grade 1 / Оптимизация изображений

Easy Thumbnail

https://pypi.org/project/easy-thumbnails/

Installation

Run pip install easy-thumbnails.

Add easy_thumbnails to your INSTALLED_APPS setting:

INSTALLED_APPS = (
    ...
    'easy_thumbnails',
)

Run manage.py migrate easy_thumbnails.

Example usage

Thumbnail options can be predefined in settings.THUMBNAIL_ALIASES or just specified in the template or Python code when run.

Using a predefined alias

Given the following setting:

THUMBNAIL_ALIASES = {
    '': {
        'avatar': {'size': (50, 50), 'crop': True},
    },
}

Template:

{% load thumbnail %}
<img src="{{ profile.photo|thumbnail_url:'avatar' }}" alt="" />

Python:

from easy_thumbnails.files import get_thumbnailer
thumb_url = get_thumbnailer(profile.photo)['avatar'].url

Manually specifying size / options

Template:

{% load thumbnail %}
<img src="{% thumbnail profile.photo 50x50 crop %}" alt="" />

Python:

from easy_thumbnails.files import get_thumbnailer
options = {'size': (100, 100), 'crop': True}
thumb_url = get_thumbnailer(profile.photo).get_thumbnail(options).url

Using in combination with other thumbnailers

Alternatively, you load the templatetags by {% load easy_thumbnails_tags %} instead of traditional {% load thumbnail %}. It’s especially useful in projects that do make use of multiple thumbnailer libraries that use the same name (thumbnail) for the templatetag module:

{% load easy_thumbnails_tags %}
<img src="{% thumbnail profile.photo 50x50 crop %}" alt="" />

Fields

You can use ThumbnailerImageField (or ThumbnailerField) for easier access to retrieve or generate thumbnail images.

For example:

from easy_thumbnails.fields import ThumbnailerImageField

class Profile(models.Model):
    user = models.OneToOneField('auth.User')
    photo = ThumbnailerImageField(upload_to='photos', blank=True)

Accessing the field’s predefined alias in a template:

{% load thumbnail %}
<img src="{{ profile.photo.avatar.url }}" alt="" />

Accessing the field’s predefined alias in Python code:

thumb_url = profile.photo['avatar'].url