The tilt-shift effect is a process in which a photograph or video of location is made to look like a photograph of a miniature scale model.
Blurring parts of the photo simulates the shallow depth of field normally encountered in close-up photography, making the scene seem much smaller than it actually is; the blurring can be done either optically when the photograph is taken, or by digital postprocessing. Many faked-miniature photographs are taken from a high angle to simulate the effect of looking down on a miniature. (from Wikipedia – Full Article)
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