easy-thumbnails 1.0-alpha-16

Easy thumbnails for Django

The powerful, yet easy to implement thumbnailing application for Django.

To install this application into your project, just add it to your INSTALLED_APPS setting (and run manage.py syncdb):

INSTALLED_APPS = (
    ...
    'easy_thumbnails',
)

Template usage

To generate thumbnails in your template, use the {% thumbnail %} tag. To make this tag available for use in your template, use:

{% load thumbnail %}

Basic tag Syntax:

{% thumbnail [source] [size] [options] %}

source must be a File object, usually an Image/FileField of a model instance.

size can either be:

• the size in the format [width]x[height] (for example, {% thumbnail person.photo 100x50 %}) or

• a variable containing a valid size (i.e. either a string in the [width]x[height] format or a tuple containing two integers): {% thumbnail person.photo size_var %}.

options are a space separated list of options which are used when processing the image to a thumbnail such as sharpen, crop and quality=90.

Model usage

You can use the ThumbnailerField or ThumbnailerImageField fields (based on FileField and ImageField, respectively) for easier access to retrieve (or generate) thumbnail images.

By passing a resize_source argument to the ThumbnailerImageField, you can resize the source image before it is saved:

class Profile(models.Model):
    user = models.ForeignKey('auth.User')
    avatar = ThumbnailerImageField(
        upload_to='avatars',
        resize_source=dict(size=(50, 50), crop='smart'),
    )

Lower level usage

Thumbnails are generated with a Thumbnailer instance. For example:

from easy_thumbnails.files import get_thumbnailer

def square_thumbnail(source):
    thumbnail_options = dict(size=(100, 100), crop=True, bw=True)
    return get_thumbnailer(source).get_thumbnail(thumbnail_options)

By default, get_thumbnail saves the file (using file storage). The source file used to instanciate the Thumbnailer must be one of the following:

• Thumbnailer instance

• FieldFile instance (i.e. a model instance file/image field property)

• File or Storage instance, and for both of these cases the relative_name argument must also be provided

• A string, which will be used as the relative name (the source will be set to the default storage)

The ThumbnailFile object provided makes this easy:

from easy_thumbnails import ThumbnailFile

# For an existing file in storage:
source = ThumbnailFile('animals/aarvark.jpg')
square_thumbnail(source)

# For a new file:
picture = open('/home/zookeeper/pictures/my_anteater.jpg')
source = ThumbnailFile('animals/anteater.jpg', file=picture)
square_thumbnail(source)