python遍历图像像素并修改

import os
import numpy as np
from PIL import Image

def revise_pix(imgpath,destpath):
    pathDir = os.listdir(imgpath)
    for alldir in pathDir:
        child = os.path.join(imgpath,alldir)
        dest = os.path.join(destpath,alldir)

        img = Image.open(child)
        img_array = np.array(img)
        # print(img_array)
        shape = img_array.shape    #将图像转为矩阵
        print(shape)
        # print(img_array.shape)       #图像大小
        for i in range(0, shape[0]):        #行总数
            for j in range(0, shape[1]):    #列总数
                # print(img_array[i,j])
                value = img_array[i, j]    #数组中的元素
                if value >= 10:
                    value = 0
                    img_array[i,j] = value
        img2 = Image.fromarray(np.uint8(img_array))
        img2.save(dest)



if __name__== "__main__":
    imgpath = r'E:\1\lab'
    destpath = r'E:\1\lab1'
    revise_pix(imgpath,destpath)