class Profile_list(models.Model):
    thumbnail = models.ImageField(upload_to='files/avas/thumb/', blank=True, null=True, editable=False)
    avatar=models.ImageField(upload_to="files/avas/", verbose_name="Аватар",blank=True)
    def save(self, force_insert=False, force_update=False):
        #get mtime stats from file
        
        thumb_update = False
        if self.thumbnail:
            statinfo1 = os.stat(self.avatar.path)
            statinfo2 = os.stat(self.thumbnail.path)
            if statinfo1 > statinfo2:
                thumb_update = True

        if self.avatar and not self.thumbnail or thumb_update:
            from PIL import Image

            THUMB_SIZE = (50, 50)

            #self.thumbnail = self.avatar

            image = Image.open(self.avatar.path)

            if image.mode not in ('L', 'RGB'):
                image = image.convert('RGB')

            image.thumbnail(THUMB_SIZE, Image.ANTIALIAS)
            (head, tail) = os.path.split(self.avatar.path)
            (a, b) = os.path.split(self.avatar.name)

            if not os.path.isdir(head + '/thumbs'):
                os.mkdir(head + '/thumbs')

            image.save(head + '\\thumbs\\' + tail)

            self.thumbnail = a + '/thumbs/' + b	
      super(Profile_list, self).save()