[单项选择]
THE ILLUSION OF FILM
1 Film is an illusion because the moving pictures seen on the screen are not moving at all. A fihn is actually a series of tiny still pictures, or flames. They appear to be moving because the retina of the human eye retains the impression of an object for a split second after that object has actually disappeared. This principle is known as the
persistence of vision. When we look at a single frame of film, the image persists in the brain’s visual center for a fraction of a second. Then, the next frame comes along and the brain has to catch up with the new image. Thus, our eyes and brain trick us into thinking that we see a smoothly moving image rather than a series of still ones.
2 Another illusion of film is known collectively as special effects, the tricks and techniques that filmmakers use when makeup, costume, and stunts are still not enough to make a scene convincing. Special effects artists apply scien
A. The most effective way to lower the cost of a fihn is to replace location photograph3 with studio sets or backgrounds.
B. Special effects technicians build painted or projected backgrounds that appear more realistic than location photography.
C. One way to reduce costs is to repaint old studio sets and use them again; this also adds to the number of available sets.
D. Painted and projected backgrounds are special effects that improve or replace sets, thus making filming less expensive.