A = imread('ngc6543a.jpg');
imshow(A)
size(A)

ans =

   650   600     3

imshow(A(:,:,1))
imshow(A(:,:,2))
imshow(A(:,:,3))
imshow([A(:,:,1), A(:,:,2), A(:,:,3)])
imshow([A,A(:,:,1), A(:,:,2), A(:,:,3)])
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R = uint8(zeros(650,600,3));
G = R;
B = R;
R(:,:,1) = A(:,:,1);
G(:,:,2) = A(:,:,2);
B(:,:,3) = A(:,:,3);
imshow([R, G, B])
imshow([A, R, G, B])
R(:,:,1) = R(:,:,1)*0.5;
imshow([A, R, G, B])
imshow([R+G+B, R, G, B])
imshow([A, R, G, B])
imshow([A, R*2, G, B])
C = R+G+B;
imshow(C)
imwrite(C,'ngc6543b.jpg');
D = imread('Wavy.gif');
imshow(D(:,:,:,1))
size(D)

ans =

   200   320     1    30

[imgs, map] = imread('Wavy.gif','frames','all');
size(imgs)

ans =

   200   320     1    30

imshow(D(:,:,:,1),map);
imshow(D(:,:,:,15),map);
diary off