Convert it into index type

I have this two Question :

1)Read the image (‘flage.png’)?

2)Convert it into index type and display it ?

I solved the first one :

image_mat = imread('flage.png');

But How can i solve the second one ?

[madhan ravi]

What do you mean by index type?

Answer 1

[Walter Roberson]

          [image_mat, cmap] = imread('flage.png');
          if isempty(cmap)
              if ndims(image_mat) > 2
                  image_rgb = image_mat;
              else
                  image_rgb = repmat(image_mat, [1 1 3]);
              end
          else
              image_rgb = ind2rgb(image_mat, cmap);
          end
          
          imshow(image_rgb)