//    Instruction Example :      pattern.colorbalance.stack (float,float,float,long)


        screen.resolution.set (512,384)

        pattern.colorbalance.stack (0.2,0.2,1.3,0)
        pattern.display ("avo\bubble.gif")

        screen.set (FRONT)
          text.display ("Press a key to exit.",CENTER,350)
        screen.end ()

        keyboard.wait ()

        script.stop ()