Whats the difference surrounded by Rear Projection (DLP) and Front Projection?
Answers: Rear projection effect
This article or section is within need of attention from an expert on the subject.
WikiProject Filmmaking may be capable of help conscript one.
If a more appropriate WikiProject or portal exists, please adjust this template accordingly.
Rear projection effect is an in-camera special effects technique contained by film production for combining foreground performances next to pre-filmed backgrounds. Rear projection be conceived long before its actual usage; however, it be only made possible contained by the 1930s due to three necessary industrial developments. Namely, simple camera and projector motors which could be linked up for synchronization of their shutters be not available until the demands of sound technology made constant-speed motors for picture equipment necessary. Secondly, Eastman Kodak's introduction of panchromatic show stock in 1928 allowed for the camera to expose the projected circumstance more than orthochromatic stocks, making it look less lightheaded than it would have beforehand. Finally, the larger film gauge beginning to emerge surrounded by the late 1920s demanded more powerful projection lamp, which were subsequently available for making the flipside projection screen brighter and thus more properly exposed. Twentieth Century Fox be the first to use the technique, in 1930 next to their films Liliom and then Just Imagine, and be subsequently awarded a technical Oscar for their work the subsequent year. Shortly following this, Paramount Studios' Farciot Edouart refined the technique starting surrounded by 1933, and developed several new methods, such as syncing three projectors near the same setting plate for more even and bright exposure.
The actor stands contained by front of a screen while a projector positioned at the back the screen cast a reversed image of the framework. The system was used contained by many elderly Hollywood movies, but required a large space to picture as the projector had to be placed some distance from the rear legs of the screen. Frequently the environment image would appear wobbly and washed out compared to the foreground.
Alfred Hitchcock used the process successfully to show Cary Grant man attacked by a crop duster plane in North by Northwest, but be criticized when he used it extensively in Marnie.
Innovations such as bluescreen and front projection enjoy rendered rear projection out of date, though Quentin Tarantino used the process for the taxi ride sequence of Pulp Fiction, and James Cameron used reverse projection for several special effects shots within Aliens, including the crash of the Dropship.
Such so-called "process shots" be widely used to film actor as if they were inside a moving vehicle, but who be, in trueness, in a vehicle mock-up on a soundstage.
The motion picture that is projected can be still or moving. It is call the "plate." One might hear the command "Roll plate." to instruct stage crew to begin projecting.
front projection effect
A front projection effect is an in-camera optical effects process in show production for combining foreground performance next to pre-filmed background footage.
Working
In contrast to backside projection, in front projection the milieu image is projected on to both the comic and the background blind. This is achieved by have a screen made of Scotchlite, a product of the 3M company i.e. also used to make screen for movie theatres. Scotchlite is made from millions of glass bead cut in partially and affixed to the surface of the cloth. These glass bead reflect flimsy back singular in the direction surrounded by which it came, far more neatly than any common surface. In reality, Scotchlite is 1000 times more reflective than the human body.
The actor (or horse or spaceship, etc.) perform in front of the reflective eyeshade with a movie camera pointing straight at him. In front of the camera is a one-way mirror angled at 45 degree. At 90 degrees to the camera is a projector which cast a faint imitation of the background on to the one-way mirror which reflect the image onto the comedian and the screen; the symbol is too faint to appear on the thespian but shows up clearly on the screen. In this path, the actor become his own matte. The combined image is transmitted through the one-way mirror and record by the camera.
Front projection was invented by William F. Jenkins, better prearranged to readers of science fiction by his nom de plume as Murray Leinster.
The technology needed for front projection be available since the invention of Scotchlite in the 1940s, but apart from some minor industrial experiments in 1949, the process would not be used for fact films until 1966, during the filming of 2001: A Space Odyssey. The actor in ape suits be filmed on a stage at Elstree and combined near footage of Africa. (The effect is revealed in the luminous cheetah's eyes reflecting back the bedside light.) Dennis Muren utilized a very similar solution for his 1967 debut picture Equinox, although Muren's technique didn't employ Scotchlite.
Zoptics
Front projection be chosen as the main method for shooting Christopher Reeve's flying scene in Superman: The Movie. However, they still face the problem of having Reeve in actual fact fly in front of the camera. Yugoslav effects wizard Zoran Perisic devised a unsullied refinement to front projection that involved placing a zoom lens on both the movie camera and the projector. These zoom lenses be synched by computer so as the camera zooms within, the projector zooms out, or vice versa. The conditions grows smaller and the actor grows bigger; thus Superman flies towards the camera. Perisic call this technique Zoptics. The process was also used contained by two of the Superman sequels — but not used contained by the fourth due to budget constraints — Santa Claus: The Movie and Perisic's sole film as director Sky Bandits (also prearranged as Gunbus.)
IntroVision
In Front projection, light from the projector that travels through the one-way mirror is “soaked up” by black velvet. In IntroVision, the black velvet is replaced by another Scotchlite eyeshade that reflects the figure back towards another Scotchlight eyeshade placed before the singer. Thus, the same statue appears from two different sources and lands on two different screens creating a “3D” effect[citation needed]. IntroVision be first used in Outland to combine star Sean Connery next to models of the Io mining colony. It was also used contained by Under Siege, Army of Darkness and The Fugitive, where it seem to place Harrison Ford on top of a model bus that be then ram by a model train.
Front projection phased out
Front projection had several advantages over its leading rival bluescreen. It didn't have the sticky black outlines that sometimes appear on bluescreen films. It was smaller quantity time consuming - and therefore smaller quantity expensive - than the long process of optically separating and combining the background and foreground imagery using an optical printer. It allowed the director (if not necessarily the actors) to see the background and name out necessary adjustment (“Jump now, Harrison!”). And, especially near Zoptics, it was a more flexible system that allowed for more complex sequences that could be attempted at the time near bluescreen. However, advancements within digital compositing have rendered front projection redundant. The last focal blockbuster to extensively use front projection was the Sylvester Stallone behaviour thriller Cliffhanger.
The difference in backside pro and front pro is that rearward projection is inside the small screen box (like a normal televison). A front projection tv is a small projector that projects onto a eyeshade (like a cinema), the advantages of a rear pro is that its easier to set up (smaller space needed to work) and the advantages of a front projection is that the blind size can be changed depending on the distance of the projector.
http://akamaipix.crutchfield.com/ca/revi...
http://www.hometheaterhifi.com/volume_6_...
The answers post by the user, for information only, CeQnA.com does not guarantee the right.
Related Questions :