The accelerated or time-lapse ( time interval in English) is an effect Cinéma tographic consitant to accelerate the speed of a video obtained by filming a sequence with a number of Images a second lower than that of projection.

This effect can be used to mean the time which passes. For example with a plan of a sun which lies down with the accéléré.
The opposite is the Ralenti.

Process

For the cinema, the speed of projection being standardized with 24 images a second, it is thus necessary to film at a lower speed to obtain an effect of accelerated .

The camera films the scene with 6 Images a second. With the reading, these images are assembled with this time a Fréquence of 24 images a second, and thus appear faster (four times more quickly).

Over long periods, it is also possible to take photographs with regular intervals.

External bonds

• Site dedicated to the time-lapses: examples and explanations of realization