I've actually gotten a few emails about my django thumbnailer code recently, turns out a search for "django image thumbnails" now has me on the front page of listings from google.
Anyway, i actually use an updated version from my previous post which i've included here:
import os
import Image
from django import template
from django.conf import settings
register = template.Library()
ERROR_IMG = settings.DEFAULT_ERROR_IMAGE
def create_thumbnail_image_file(file, width, height):
""" Create a thumbnail image and return the path """
if not file:
return ERROR_IMG
basename, format = file.rsplit('.', 1)
thumb = basename + '_' + str(width) + 'x' + str(height) + '.' + format
thumb_filename = os.path.join(settings.MEDIA_ROOT, thumb)
thumb_url = os.path.join(settings.MEDIA_URL, thumb)
filename = os.path.join(settings.MEDIA_ROOT, file)
if os.path.exists(thumb_filename):
if os.path.getmtime(thumb_filename) < os.path.getmtime(filename):
os.unlink(thumb_filename)
else:
return thumb_url
image = Image.open(filename)
image.thumbnail([width, height], Image.ANTIALIAS)
image.save(thumb_filename, image.format)
return thumb_url
class ThumbnailerNode(template.Node):
def __init__(self, image, width, height):
self.image = image
self.width = width
self.height = height
def render(self, context):
try:
actual_image = template.resolve_variable(self.image, context)
return create_thumbnail_image_file(actual_image, self.width, self.height)
except template.VariableDoesNotExist:
return ERROR_IMG
@register.tag(name="thumbnail")
def thumbnail(parser, token):
try:
tag_name, image, width, height = token.split_contents()
except ValueError:
raise template.TemplateSyntaxError, " %r tag requires exactly 3 arguments" % token.contents[0]
return ThumbnailerNode(image, int(width), int(height))
<
I think calling this from a template is much nicer than the old code using a filter. You can now just insert:
{% thumbnail <image_object> width height %}
