Based on http://www.djangosnippets.org/snippets/192/
But this works with Django 1.1 while maintaining the same functionality.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 | import os
import Image
from django.template import Library
register = Library()
def thumbnail(file, size='200x200'):
"""
Example:
<img src="object.get_image_url" alt="original image" />
<img src="object.image|thumbnail" alt="image resized to default 200x200 format" />
<img src="object.image|thumbnail:"200x300" alt="image resized to 200x300" />
The filter is applied to a image field (not the image url get from
get_image_url method of the model), supposing the image filename is
"image.jpg", it checks if there is a file called "image_200x200.jpg" or
"image_200x300.jpg" on the second case, if the file isn't there, it resizes
the original image, finally it returns the proper url to the resized image.
"""
if file:
# defining the size
x, y = [int(x) for x in size.split('x')]
# defining the filename and the miniature filename
basename, format = file.path.rsplit('.', 1)
baseurl, _format = file.url.rsplit('.', 1)
#miniature = basename + '_' + size + '.' + format
#miniature_filename = os.path.join(settings.MEDIA_ROOT, miniature)
#miniature_url = os.path.join(settings.MEDIA_URL, miniature)
miniature_filename = basename + '_' + size + '.' + format
miniature_url = baseurl + '_' + size + '.' + format
# if the image wasn't already resized, resize it
if not os.path.exists(miniature_filename):
#print '>>> debug: resizing the image to the format %s!' % size
image = Image.open(file.path)
image.thumbnail([x, y]) # generate a 200x200 thumbnail
image.save(miniature_filename, image.format)
return miniature_url
return ''
register.filter(thumbnail)
|
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Comments
This works great. Consider changing image.thumbnail([x, y]) to image.thumbnail([x, y], Image.ANTIALIAS) for higher-quality resizes.
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