% Original script belongs to Asad Ali
% GIK Institute of Engineering Sciences & Technology, Pakistan
% Email: asad_82@yahoo.com
% This is a modified version
function [red, green, blue,m,n] = GenerateData()
D = im2double(imread('lena.png'));
[m,n] = size(D(:,:,1));

for i=1:m
    for k=1:n
    red(k,i)=D(k,i,1);
    green(k,i)=D(k,i,2);
    blue(k,i)=D(k,i,3);
    end
end

Published with MATLAB® R2018a