clc, clear all, close

lena1 = imfinfo('lena.jpg');
lena2 = imfinfo('lena.bmp');

I = imread('lena.jpg');
J = imread('lena.bmp');
K = rgb2gray(I);

figure(1)
imshow(I);
figure(2)
imshow(J);
figure(3)
imshow(K);

imwrite(K,'lena_gray.bmp');

K = double(K);

figure(4)
colormap gray;
mesh(K);

figure(5)
plot(I(10,:));

figure(6)
plot(I(:,5));