how to convert index image into rgb image

how to convert index image into rgb image

[kamarthi vanitha]

if i use [X1,cmap]=imread('c09_1.tif');

RGB1 = ind2rgb(X1,cmap);I am getting error as:

Index in position 1 exceeds array bounds.

Error in ind2rgb (line 26)

r = zeros(size(a)); r(:) = cm(a,1);

Error in Script_gray (line 15)

RGB1 = ind2rgb(X1,cmap);

please fix this error