Useful definitions for FILM TECHNOLOGIES

Film-Film is a term that encompasses individual motion pictures, the field of film as an art form, and the motion picture industry. Films are produced by recording actual people and objects with cameras, or by creating images using animation techniques or special effects.

CGI-Computer-generated imagery (often abbreviated to CGI) is the application of the field of computer graphics (or more specifically, 3D computer graphics) to special effects in films, television programs, commercials, simulators and simulation generally, and printed media. Video games usually use real-time computer graphics (rarely referred to as CGI), but may also include pre-rendered "cut scenes" and intro movies that would be typical CGI applications. These are referred to as FMV.
CGI is used for visual effects because the quality is often higher and effects are more controllable than other more physically based processes, such as constructing miniatures for effects shots or hiring extras for crowd scenes, and because it allows the creation of images that would not be feasible using any other technology. It can also allow a single artist to produce content without the use of actors, expensive set pieces, or props.

Digital film-Digital film refers to cinema production and performance systems which work by using a digital representation of the brightness and colour of each pixel of the image.
This allows much more flexible post-production in the digital domain than would be possible using analogue techniques such as traditional film opticals.

Imax-IMAX (for Image Maximum) is a film format created by Canada's IMAX Corporation that has the capacity to display images of far greater size and resolution than conventional film display systems. A standard IMAX screen is 22 m wide and 16 m high (72.6 x 52.8 ft), but can be larger. Currently, IMAX is the most widely-used system for large-format, special-venue film presentations. As of March 2007, there were 280 IMAX theatres in 38 countries (60 percent of these are located in the United States and Canada). Half of these are commercial theatres and half are in educational venues.(wikipedia)