How can I combine four bands into an image?

can anyone suggest me how combining four bands (i.e Red, green,blue and NIR) into an image ?

Answer 1

[Image Analyst]

Here's one discussion: http://landsat.gsfc.nasa.gov/?page_id=5377

Another one: http://white.stanford.edu/teach/index.php/Methods_for_displaying_hyper_spectral_scenes_on_standard_RGB_displays_-_Noy_Cohen

And even more: https://www.google.com/?gws_rd=ssl#q=displaying+spectral+bands+in+RGB

[shiraz karray]

Thank you so much for your reply. But what i want is as follow: if i can found a function in MATLAB like "cat" which can help me to combine the four components into an image to display it ?

[Image Analyst]

No. You can use cat(3,r,g,b) to combine 3 of them, but to get all 4 you'd have to get the three r,g, and b from a weighted sum of the 4, which is what the links I gave you show.

[shiraz karray]

Ok,Thank you very much