Given a (large) image, generate a 10x10px thumbnail
        with blur effect (in order to keep the size small)

def generate_thumb(self, image):
        """
        Given a (large) image, generate a 10x10px thumbnail
        with blur effect (in order to keep the size small)
        """
        image_file = image.file
        picture = Image.open(image_file).convert('RGB')
        picture.thumbnail((10, 10))
        picture.filter(ImageFilter.GaussianBlur(radius=4))
        absolute_path = self.build_thumb_path(image)
        self.save_thumb(picture, absolute_path)