Generally, after shooting the video with the traditional green screen, art designerneeds a lot of time on image matting and repairing the color overflow problem, but ledscreen won't. With the applications of camera tracking and real-time engine as well asled video walls, shooting is no longer limited by place or time. Designers and directorscan adjust the scene on set in real time, while actors can react to actual images andcompose pictures as accurately as they would in a real environment. So, it greatlyreduces uncertainty. speeds up the shooting process and saves cost & time.