Generate all colour permutations of an image

Hello,

I am looking to take the mondrian art image below and generate all the possible colour permutations. Does anyone have advice as to how to go about this?

Answer 1

[Chunru]

x = imread("image.png");
image(x)
% unique colors in the image
uc = unique(reshape(x, numel(x)/3, 3), 'rows');
nc = size(uc, 1);
fprintf('There are %d unique colors\n', nc);

p = perms(1:nc);
fprintf('There are %d permutations of colors\n', size(p, 1));

x2 = reshape(x, numel(x)/3, 3);  
for i=1:size(p,1)
    xp = x2;
    for j=1:nc
        idx = all(x2 ==  uc(j,:), 2);
        for k=1:3
            xp(idx, k) = uc(p(i,j), k);
        end
    end
    xp = reshape(xp, size(x));
    image(xp);
    drawnow
    pause(0.05)
end

[Noah Posner]

Thank you!