Figure 1.1

The Illusion of Motion in Motion Pictures

A motion picture is actually a series of individual photographs. When a strip of film is projected, each separate picture (or “frame”) is held briefly in front of the projecting light and then replaced with the next one. The illusion of apparent motion produces the perception of a smooth, continuous flow if two conditions are met: (1) the images must be sufficiently similar, and (2) the mechanical process that moves the filmstrip through the projector must be sufficiently rapid and smooth.

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