utils.py 文件源码

def binarize_image(image):
    from PIL import Image

    binary = None

    try:
        im = Image.open(image)
        thumb = im.copy()
        thumb.thumbnail((260, 260))
        image_buffer = StringIO()
        thumb.save(image_buffer, "JPEG")
        binary = Binary(image_buffer.getvalue(), BINARY_SUBTYPE)
    except IOError as e:
        logging.error("failed to binarize image: "+str(e))
        return None

    # if image is a file object, rewind it
    finally:
        try:
            image.seek(0)
        except AttributeError:
            pass

    return binary