color_gradient

clear all
close all

f = ones(256);
fr = f
fr(:, 1:128) = 0;
fg = fr;
fb = f;
fb(128:256,:) = 0;

figure,
subplot(221); imshow(fr);
subplot(222); imshow(fg);
subplot(223); imshow(fb);


rgb = cat(3, fr, fg, fb);
subplot(224); imshow(rgb);