Ngui Camera and Image effects

Hey All

Currently working on a project for uni, I am using NGUI from the asset store to make my GUI.
I am adding a bloom effect to the NGUI camera, (The camera created when you create a 2d UI from the NGUI menu)and it is displaying this bloom over my entire scene, I am not very experienced with imaged effects, but i guessed that is occuring becasue the camera is displaying GUI which is on the top layer, to anyone who has used NGUI, is it possible the to make the bloom only affect the GUI and nothing below it?

any help would be greatly appreciated!!

Cheers