the image or output is not displaying ? if i remove function line it showing error like if max(max(R)) > 1.0 || max(max(G)) > 1.0 || max(max(B)) > 1.0

rgb = imread('street2.jpg');   %it is one of the MATLAB examples
[L, a, b] = RGB2Lab(rgb);

%the rest is for presentation, not part of how you use the routine
figure(1);
imagesc(L);
colormap(gray(256));
colorbar();
title('L plane');
figure(2);
imagesc(a);
colormap(gray(256));
colorbar();
title('a plane');
figure(3);
imagesc(b);
colormap(gray(256));
colorbar();
title('b plane');

[Walter Roberson]

If you remove what function line?

How does this question differ from http://uk.mathworks.com/matlabcentral/answers/239345-the-output-for-this-is-not-displayed ?