How do I convert my grayscale image back to its true color(RGB)?

dog=imread('dogImage.png'); hidden01=imread('hidden01.png'); f=flatten(hidden01);%flattenning image function red=dog(:,:,1); for x=1:160000; if f(x)==0 a(x)=red(x)-1;

    end
    if f(x)==1
        a(x)=red(x)-0;
    end
end
a=reshape(a,400,400);
%rgbImage = cat(3, a, a, a)
rgbImage = ind2rgb(a, colormap)
%rgb=a(:,:,[1 1 1]); 
figure()
image(rgbImage);
axis off

Answer 1

[Star Strider]

You don’t.

Once you’ve lost the colour information, you can’t retrieve it.