To create a false color image

Hi all;

I am doing an assignment that create a false color image from stretched channel of each color. I got stuck in creating an image from 4 color channel. Any possible to create an rgb image from 4 color channels. Sorry, I cannot attach the files because the file is .tif files

If I have that image, the next step I do for creating false color image is changing to index image by using rgb2ind function and convert back to false color image by using ind2rgb(indexedImage, jet(256)) right? The false color image will be from infrad_red to red, red to green, and green to blue

I really appreciate about your help.

clc;
close all;
clear all;
I1 = imread('red.tif');
I2 = imread('blue.tif');
I3  =imread('green.tif');
I4 = imread('infra_red.tif');
I1g = im2gray(I1);
I2g = im2gray(I2);
I3g = im2gray(I3);
I4g = im2gray(I4);



Ir = imadjust(I1, [0.3 0.6],[0.0,1.0]);
Ir_eq = histeq(I1);

Ib = imadjust(I2, [0.22 0.72],[0.0,1.0]);
Ib_eq = histeq(I2);


Ig = imadjust(I3, [0.02 0.48], [0 1]);
Ig_eq = histeq(I3);


Ii = imadjust(I4, [0.7 1], [0 1]);
Ii_eq = histeq(I4);


rgbImage = cat(3, Ir, Ig, Ib);
imshow(rgbImage);

Coloredimage = cat(4,I1g,I2g,I3g,I4g);
imshow(Coloredimage)
falseColoredImage = ind2rgb(cat(4,Ii_ind,Ir_ind,Ig_ind,Ib_ind), jet(256));
imshow(falseColoredImage);