how to convert grey image to RGB?

i have 60 slice grey image. how want to convert to RGB image?

as attached is my grey image (grey.jpg). rgb.jpg is from internet what i want like.

this is my coding, but got error.

P = zeros(103, 103, 60);
for K = 1 : 60
K_file=30+10*K;
petname = sprintf('I%d.dcm', K_file);
P(:,:,K) = dicomread(petname);
scale = 130/103 ;
Pi(:,:,K) = imresize(P(:,:,K),scale) ; % where P is your 103*103 3D matrix

end
rgbImage = gray2rgb(Pi);
imshow3D(rgbImage)

this is my function

function [Image]=gray2rgb(Image)
%Gives a grayscale image an extra dimension
%in order to use color within it
[m n]=size(Image);
rgb=zeros(m,n,3);
rgb(:,:,1)=Image;
rgb(:,:,2)=rgb(:,:,1);
rgb(:,:,3)=rgb(:,:,1);
Image=rgb/255;
end

BUT GOT ERROR.

Unable to perform assignment because the size of the left side is 130-by-7800 and the size of
the right side is 130-by-130-by-60.
Error in gray2rgb (line 6)
rgb(:,:,1)=Image;
Error in sliderspect1 (line 12)
rgbImage = gray2rgb(Pi);

NOTE:-

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Your Pi is a [130 x 130 x 60] matrix, but your function gray2rgb() expects a 2D matrix as input. It is not clear how you want to convert the 60 layers of the image data to RGB channels.

Maybe you want:

[r,c,m]  = size(Pi);
rgbImage = repmat(reshape(Pi / 255, [r, c, 1, m]), [1, 1, 3, 1]);

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