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Were my responses in your duplicate question http://www.mathworks.com/matlabcentral/answers/76170-how-to-generate-background-noise-in-a-color-image not what you were looking for? You could have continued the discussion there instead of posting a new question like it's brand new.
How much noise is wanted? And do you want Gaussian white noise or just random noise?
If you image data is saved in A, I would say you could add Gaussian white noise by doing as shown below.
thesize = size(A); noisesize = 20; % You choose! for i = 1:3; Y(:,:,i) = uint8(double(A(:,:,i))+wgn(thesize(1),thesize(2),noisesize)); end
And then you output data should be in Y with white noise added.