To create a custom colormap, specify map as a three-column matrix of RGB triplets where each row defines one color. An RGB triplet is a three-element row vector whose elements specify the intensities of the red, green, and blue components of the color. The intensities must be in the range [0,1]. A value of 0 indicates no color and a value of 1 indicates full intensity. For example, this is a colormap with five colors: black, red, green, blue, and white.

mymap = [0 0 0

1 0 0

0 1 0

0 0 1

1 1 1];

Use mymap as the colormap for the figure.

colormap(mymap);

A=[0 0 1 ; 0 1 1 ; 1 1 2]

B=zeros(size(A,1),size(A,2),3);

for i=1:size(A,1)

  for j=1:size(A,2)

      if  A(i,j) < 1

        B(i,j,2)=255;

      elseif A(i,j) == 1

         B(i,j,1)=255;

      else

         B(i,j,3)=255;

       end

  end

end

imshow(B,[])

This is a simple solution.

@ Gabor

Thanks a lot. It works well with my simple example. I shout try it with the complicated real example.

@ Hossein

Thank you. Your method is really simple and interesting!