The moving images of a film are created by photographing actual scenes with a motion-picture camera, by photographing drawings or miniature models using traditional animation techniques, by means of CGI and computer animation, or by a combination of some or all of these techniques, and other visual effects.Before the introduction of digital production, a series of still images were recorded on a strip of chemically sensitized celluloid (photographic film stock), usually at a rate of 24 frames per second.