闪烁水印在Python中没有前进，停留在-9223372036854775808

import cv2

def add_blinking_watermark(image_path, watermark_path):
    # 读取原始图像和水印图像
    image = cv2.imread(image_path)
    watermark = cv2.imread(watermark_path, cv2.IMREAD_UNCHANGED)

    # 调整水印大小以适应原始图像
    watermark = cv2.resize(watermark, (image.shape[1], image.shape[0]))

    # 添加闪烁水印效果
    for alpha in range(0, 255, 10):
        overlay = image.copy()
        cv2.addWeighted(watermark, alpha / 255.0, overlay, 1 - alpha / 255.0, 0, image)
        cv2.imshow("Blinking Watermark", image)
        cv2.waitKey(100)

    cv2.destroyAllWindows()

# 使用示例
add_blinking_watermark("original_image.jpg", "watermark.png")