Time Lapse Photography The frequency at which film frames are captured is much more spread out than frequency which is used to view the video/sequence. The time appears to be moving faster when played at a normal speed, and thus lapsing. For example, an image of a scene may be captured at 1 frame per second (fps), but then played back at 30 frames per second; the result is an apparent 30 times speed increase. Similar to that, films can also be played at much lower rate than at which it was actually captured, slowing down an otherwise fast action, as in slow motion or high-speed photography. So the photographs can be played back as a film at a speed that shows the subject appearing to move. The word time lapse is more and more used in different industry. The processes that would normally appear subtle and slow to the human eye, e.g. the motion of the sun and stars in the sky or the growth of a plant, are become very pronounced. Time-lapse is an extreme version of the cinematography technique of under cranking. Animation like stop motion is a comparable technique; which is a subject that does not actually move, such as a puppet, can repeatedly be moved manually by a small distance and then photographed. Then after that the photographs can be played back as a film at a speed that shows the subject appearing to move. Some classic subjects of time-lapse photography include: Landscapes and celestial motion plants growing and flowers opening fruit rotting and expiring evolution of a construction project
people in the city The frame rate of time-lapse movie photography can be varied to virtually at any degree. Degree may vary from a rate approaching a normal frame rate (between 24 and 30 frames per second) to only one frame a day, a week, or longer, which is depending on subject. The term "time-lapse" can be also apply to how long the shutter of the camera is open during the exposure of each frame of a film (or video), and has also been applied to the use of a long-shutter openings used in still photography in some older photography circles. We can create stunning time-lapse images by moving a camera during the shot. A time-lapse camera can be mounted to a car which is moving for example to create a motion of an extreme speed. However, to achieve the effect of a simple tracking shot, it is necessary to use the motion control to move the camera. The camera at a glacially slow pace and a motion control rig can be set to a dolly or pan. An image is projected, and after that this image could be appear that the camera is moving at a normal speed while the world around it is in time lapse. This juxtaposition can greatly heighten the time-lapse illusion. The speed that the camera must move to create a perceived camera motion which is in normal that can be calculated by inverting the time-lapse equation: Actual speed = (frame rate of camera /projection frame rate) * perceived speed One of the first films to use this effect to its extreme was Baraka. The Time-lapse can be combined with techniques such as high-dynamic-range(HDR) imaging. One of the methods to achieve HDR involves bracketing for each frame. In order to produce a group of pictures, three photographs that are taken at a separate exposure values and for each frame representing the highlights, mid-tones, and shadows. The bracketed groups are consolidated into individual frames. Those frames are then sequenced into video.
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