from 15 to 200 frames per second: the human eye can feel the difference in flow to about 200 frames per second

At the time of silent films was the cameraman, pressing his tool by a crank that returned the noble task to print the film’s pace. Until the late 1920s, the number of frames per second depends on the film, some films up to 24 frames when others hang out at 15-16. This is why some silent films screened today appear jerky. If the approach Nosferatu seems a bit choppy, it is not due to osteoarthritis.

The TV lounge running in time with the frequency of the electrical current, the projection speed increased to 25 frames per second (actually 50 interlaced frames or 50 Hz) in Europe (PAL) and 29.97 (60 Hz) in the United States and Japan (NTSC).

in Europe, image and sound were accelerated by 4%: the 24 images become 25. If the untrained eye does not notice, the process leads to a change in the ear tone, about a semitone acute. If the voice of Tom Waits pulls a soprano range in Coffee & Cigarettes on your TV dinner Sunday night, it’s not because of a sore throat. Another consequence is disastrous: the pleasure is shortened. Accelerated to 4%, sumptuous Lelouch’s La Belle Histoire 3h30 are reduced to 3h15. NTSC only changes the picture: the frames are alternately doubled and tripled. Instead of having 24 images in the same second, 12 times one gets two frames and 12 frames three times, resulting in a decrease in fluidity.

the “progressive scan” of the new flat-screen televisions, computer screens inherited, allows 24 frames per second films to finally be visible in all rooms.

Peter Jackson turns his film The Hobbit in 48 frames per second (and projecting it in the best conditions, at the same speed). the filmmaker has chosen to inaugurate a new era. the inherent blur the camera movements will be a distant memory: the “high frame rate” allows (or promises) an immersive experience, as more and more close to the unique capabilities of our real vision

the human eye can feel the difference in flow to about 200 frames per second

Source: http://www.franceculture.fr/blog-grand-ecart-2013-04-18-le-cinema-a-la-television-le-temps

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