clear all, clc, clear, close all

ABW = imread('PictureBW.bmp');
AB = uint8(zeros(3*512,3*512));
ON=AB;

 for i = 1:512
    for j = 1:512
        ON(i+512,j+512) = AB(i+512,j+512) + ABW(i,j);
    end
 end

imshow(ON);