这个代码利用了多线程的的知识，实现了将照片灰度化的处理，程序不太复杂，但是对学习多线程的初学者来说非常有用，希望可以得到大家的认可-This code takes advantage of multithreading knowledge to achieve a grayscale photo processing program is not complicated, but for beginners learning multithreaded very useful, I hope y