color_vector =[0.....1] % o for blue, .5 for green and 1 for red
R=255,0,0
G=0,255,0
B=0,0,255

I = rand(100, 100);                               % Input data
cmap = [1 0 0 45; 0 1 0 10; 0 1 0 45; 0 0 1 0];   % Colormap defining the transformation
RGB = real2rgb(I, cmap);                          % Do the conversion