##References file validation http://timmyomahony.com/blog/upload-and-validate-image-from-url-in-django/

file overwrite http://stackoverflow.com/questions/9522759/imagefield-overwrite-image-file-with-same-name

0.1 when save image, save it to selected albums folder. (Overwrite save method) 0.2 overwrite a existing image if have same name

#install jpeg lib http://www.ijg.org/files/jpegsrc.v8c.tar.gz.

apt-get install libjpeg libjpeg-dev libfreetype6 libfreetype6-dev zlib1g-dev pip install -I pillow

##Save a thumb file

    thumb = TImage.open(self.image.path)
    thumb.thumbnail(100, 100)
    filename = "{}_thumbnail.{}".format(self.image_key, 'jpg')
    os.path.join(str(self.album), filename)

I've had to do this in a few steps, imagejpeg() in php requires a similar process. Not to say theres no way to keep things in memory, but this method gives you a file reference to both the original image and thumb (usually a good idea in case you have to go back and change your thumb size).

save the file open it from filesystem with PIL, save to a temp directory with PIL, then open as a Django file for this to work. Model:

class YourModel(Model): img = models.ImageField(upload_to='photos') thumb = models.ImageField(upload_to='thumbs') Usage:

#in upload code uploaded = request.FILES['photo'] from django.core.files.base import ContentFile file_content = ContentFile(uploaded.read()) new_file = YourModel() #1 - get it into the DB and file system so we know the real path new_file.img.save(str(new_file.id) + '.jpg', file_content) new_file.save()

from PIL import Image import os.path

#2, open it from the location django stuck it thumb = Image.open(new_file.img.path) thumb.thumbnail(100, 100)

#make tmp filename based on id of the model filename = str(new_file.id)

#3. save the thumbnail to a temp dir

temp_image = open(os.path.join('/tmp',filename), 'w') thumb.save(temp_image, 'JPEG')

#4. read the temp file back into a File from django.core.files import File thumb_data = open(os.path.join('/tmp',filename), 'r') thumb_file = File(thumb_data)

new_file.thumb.save(str(new_file.id) + '.jpg', thumb_file)

from django.core.files.uploadedfile import InMemoryUploadedFile import StringIO def MakeThumbnail(file): img = Image.open(file) img.thumbnail((128, 128), Image.ANTIALIAS) thumbnailString = StringIO.StringIO() img.save(thumbnailString, 'JPEG') newFile = InMemoryUploadedFile(thumbnailString, None, 'temp.jpg', 'image/jpeg', thumbnailString.len, None) return newFile

def createThumbnail(self):
    if not self.image:
         return
    
    from PIL import Image as TImage
    import StringIO
    from django.core.files.uploadedfile import SimpleUploadedFile
    
    THUMBNAIL_SIZE = (200,200)

    print self.image.path, self.image
    
    image = TImage.open(self.image.path)
    image.thumbnail(THUMBNAIL_SIZE, TImage.ANTIALIAS)
     
    temp_handle = StringIO()
    image.save(temp_handle, 'jpeg')
    temp_handle.seek(0)
 
    suf = SimpleUploadedFile(os.path.split(self.image.name)[-1],
             temp_handle.read())
    
    self.thumbnail.save('%s_thumbnail.%s'%(os.path.splitext(suf.name)[0],'jpg'), suf, save=False)