opencv-python图像通道转换（三通道至单通道）

通道转换

import os
import cv2

path = r' ..... '  # 图像所在路径
filelist = os.listdir(path)
print(len(filelist))
for file in filelist:
    orgin_dir = os.path.join(path, file) # 原路径
    print(orgin_dir)  # 检查路径
    img = cv2.imread(orgin_dir, cv2.IMREAD_GRAYSCALE)  # 读取灰度图
    print(img.shape)  # 打印维度
    cv2.imwrite(orgin_dir, img)  # 覆盖原图

转换对比