这段代码通过pil生成缩略图，主要通过save函数保存缩略图，自定义了图片的保存位置和原图片位置，可以自己更改，可以指定缩略图的大小。

from PIL import Image  from cStringIO import StringIO  from django.core.files.uploadedfile import SimpleUploadedFile     class Photo(models.Model):      #from sharejs.com      title = models.CharField(max_length = 100)      image = models.ImageField(upload_to ="photos/originals/%Y/%m/")      image_height = models.IntegerField()      image_width = models.IntegerField()      thumbnail = models.ImageField(upload_to="photos/thumbs/%Y/%m/")      thumbnail_height = models.IntegerField()      thumbnail_width = models.IntegerField()      caption = models.CharField(max_length = 250, blank =True)             def __str__(self):          return "%s"%self.title             def __unicode__(self):          return self.title                 def save(self, force_update=False, force_insert=False, thumb_size=(180,300)):             image = Image.open(self.image)                     if image.mode not in ('L', 'RGB'):              image = image.convert('RGB')                         # save the original size          self.image_width, self.image_height = image.size                     image.thumbnail(thumb_size, Image.ANTIALIAS)                     # save the thumbnail to memory          temp_handle = StringIO()          image.save(temp_handle, 'png')          temp_handle.seek(0) # rewind the file                     # save to the thumbnail field          suf = SimpleUploadedFile(os.path.split(self.image.name)[-1],                                   temp_handle.read(),                                   content_type='image/png')          self.thumbnail.save(suf.name+'.png', suf, save=False)          self.thumbnail_width, self.thumbnail_height = image.size                     # save the image object          super(Photo, self).save(force_update, force_insert)