Hi,
I need to use FCC in multi-spectral image using Matlab for my project

R= imread('*B4.tif');
G= imread('*B3.tif');
NIR= imread('*B5.tif');
rgb543=cat(3,NIR,R,G);
figure, imshow(rgb543);

False color (or false colour) refers to a group of color rendering methods used to display images in color which were recorded in the visible or non-visible parts of the electromagnetic spectrum. A false-color image is an image that depicts an object in colors that differ from those a photograph (a "true-color" image) would show.In addition, variants of false color such as pseudocolor (see discussion), density slicing (see discussion), and choropleths (see discussion) are used for information visualization of either data gathered by a single grayscale channel or data not depicting parts of the electromagnetic spectrum (e.g. elevation in relief maps or tissue types in magnetic resonance imaging).