RGB=reshape(ones(64,1)*reshape(jet(64),1,192),[64,64,3]); 
HSV=rgb2hsv(RGB); 
H=HSV(:,:,1); S=HSV(:,:,2); V=HSV(:,:,3); 
figure, 
subplot(2,2,1), imshow(H) 
subplot(2,2,2), imshow(S) 
subplot(2,2,3), imshow(V) 
subplot(2,2,4), imshow(RGB)