Created
November 29, 2012 03:13
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Django function to populate a thumbnail image field from another image field
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from PIL import Image as PILImage | |
import os | |
from django.core.files import File | |
from django.core.files.base import ContentFile | |
from cStringIO import StringIO | |
def create_thumbnail_from_image_field(image_field, thumbnail_image_field, | |
thumb_width, thumb_height): | |
""" | |
This function is intended to be used with a model similar to | |
class UserProfile(models.Model): | |
... | |
profile_pic = models.ImageField() | |
profile_pic_thumb = models.ImageField() | |
The profile_pic field is pre-populated eg. via user upload. | |
The thumbnail field is then generated using this function as: | |
THUMB_WIDTH = THUMB_HEIGHT = 48 | |
create_thumbnail_from_image_field(profile.profile_pic, profile.profile_pic_thumb, | |
THUMB_WIDTH, THUMB_HEIGHT) | |
""" | |
# open the image_field file to allow PIL to read from it | |
image_field.open(mode='rb') | |
# process the image_field to genearate a thumbnail | |
img = PILImage.open(image_field) | |
thumbimg = img.copy() | |
thumbimg.thumbnail((thumb_width, thumb_height), PILImage.ANTIALIAS) | |
# save the thumbnail to memory | |
mem_thumb = StringIO() | |
thumbimg.save(mem_thumb, 'png') | |
mem_thumb.seek(0) | |
# figure out the filename for the thumbnail based on the filename of the | |
# profile pic | |
path, image_basename = os.path.split(image_field.name) | |
frontname, ext = os.path.splitext(image_basename) | |
thumb_basename = frontname + '_thumb.png' # thumbs always saved as png | |
# save the thumbnail data to the actual file managed by the field | |
thumbnail_image_field.save(thumb_basename, | |
ContentFile(mem_thumb.read()), save=False) |
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The above snippet is discussed on http://atulb.me/creating-thumbnails-in-django/