批量读取黑白图像，变成三通道后保存

import os

import cv2

dirs="./3/"

out_dir="./output/3/"

fnames=os.listdir(dirs)

for f in fnames:

    print(f)

    img=cv2.imread(dirs+f,cv2.IMREAD_COLOR)

    #print(img.shape)

    cv2.imwrite(out_dir+f,img)

print("done")