Computer graphics is everywhere: on the web, in our homes (high-end appliances, computers, game consoles and television — weather, news and broadcast sports), in our cars (GPS systems), in the movies and arcades and on our persons (PDAs, mobile phones and wearable computers). The term computer graphics refers to the generation, representation, manipulation, processing and visual display of data using a computer. Computer-generated images maybe two-dimensional (2D) or three-dimensional (3D); they maybe animated or still, and portray real scenes, imagined scenes, or things not normally visible such as forces. Image processing is closely related to computer graphics but omits the initial generation phase and starts instead with an image captured by some other device.