matlab原圖像轉成灰度圖畫直方圖

clear
close all
f=imread('C:\Users\Administrator\Desktop\0\maskman.jpeg');
newmap = rgb2gray(f)
imwrite(newmap,'C:\Users\Administrator\Desktop\0\maskman2.jpeg');
f2=imread('C:\Users\Administrator\Desktop\0\maskman2.jpeg');
imhist(f2)
title('直方圖');
clear