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Front projection effect
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Front projection effect
A front projection effect is an in-camera visual effects process in film production for combining foreground performance with pre-filmed background footage. In contrast to rear projection, which projects footage onto a screen from behind the performers, front projection projects the pre-filmed material over the performers and onto a highly reflective background surface.
In contrast to rear projection, in front projection the background image is projected onto both the performer and a highly reflective background screen, with the result that the projected image is bounced off the screen and into the lens of a camera. This is achieved by having a screen made of a retroreflective material such as Scotchlite, a product of the 3M company that is also used to make screens for movie theaters. Such material is made from millions of glass beads affixed to the surface of the cloth. These glass beads reflect light back only in the direction from which it came, far more efficiently than any common surface.
The actor (or subject) performs in front of the reflective screen with a movie camera pointing straight at them. Just in front of the camera is a one-way mirror angled at 45 degrees. At 90 degrees to the camera is a projector which projects an image of the background onto the mirror which reflects the image onto the performer and the highly reflective screen; the image is too faint to appear on the actor but shows up clearly on the screen. In this way, the actor becomes their own matte. The combined image is transmitted through the mirror and recorded by the camera. The technique is shown and explained in the "making-of" documentary of the 1972 sci-fi film Silent Running.
Front projection was invented by Will Jenkins. For this he holds U.S. patent 2,727,427, issued on December 20, 1955 for an "Apparatus for Production of Light Effects in Composite Photography" and U.S. patent 2,727,429, issued the same day for an "Apparatus for Production of Composite Photographic Effects."
It was first experimented with in 1949, shortly after the invention of Scotchlite, and had appeared in feature films by 1963, when the Japanese film Matango used it extensively for its yacht scenes. Another early appearance was in 1966, during the filming of 2001: A Space Odyssey. The actors in ape suits were filmed on a stage at Elstree Studios and combined with footage of Africa (the effect is revealed in the leopard's glowing eyes reflecting back the light). Dennis Muren used a very similar solution for his 1967 debut film Equinox, although Muren's technique didn't employ Scotchlite. Two British films released in 1969, On Her Majesty's Secret Service and The Assassination Bureau, used the technique, as did the 1968 films Barbarella and Where Eagles Dare.
Front projection was chosen as the main method for shooting Christopher Reeve's flying scenes in Superman. However, they still faced the problem of having Reeve actually fly in front of the camera. Effects wizard Zoran Perisic patented a new refinement to front projection that involved placing a zoom lens on both the movie camera and the projector. These zoom lenses are synchronized to zoom in and out simultaneously in the same direction. As the projection lens zooms in, it projects a smaller image on the screen; the camera lens zooms in at the same time, and to the same degree, so that the projected image (the background plate) appears unchanged, as seen through the camera. However, the subject placed in front of the front projection screen appears to have moved closer to the camera; thus Superman flies towards the camera. The technique is analogous to the more commonly discussed dolly zoom effect.
Perisic called this technique "Zoptic". The process was also used in two of the Superman sequels (but not used in the fourth movie due to budget constraints), Return to Oz, Radio Flyer, High Road to China, Deal of the Century, Megaforce, Thief of Baghdad, Greatest American Hero (TV), as well as Perisic's films as director, Sky Bandits (also known as Gunbus) and The Phoenix and the Magic Carpet.
Introvision is a front projection composite photography system using a pair of perpendicular reflex screens to combine two projected scenes with a scene staged live before the camera in a single shot.
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Front projection effect AI simulator
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Front projection effect
A front projection effect is an in-camera visual effects process in film production for combining foreground performance with pre-filmed background footage. In contrast to rear projection, which projects footage onto a screen from behind the performers, front projection projects the pre-filmed material over the performers and onto a highly reflective background surface.
In contrast to rear projection, in front projection the background image is projected onto both the performer and a highly reflective background screen, with the result that the projected image is bounced off the screen and into the lens of a camera. This is achieved by having a screen made of a retroreflective material such as Scotchlite, a product of the 3M company that is also used to make screens for movie theaters. Such material is made from millions of glass beads affixed to the surface of the cloth. These glass beads reflect light back only in the direction from which it came, far more efficiently than any common surface.
The actor (or subject) performs in front of the reflective screen with a movie camera pointing straight at them. Just in front of the camera is a one-way mirror angled at 45 degrees. At 90 degrees to the camera is a projector which projects an image of the background onto the mirror which reflects the image onto the performer and the highly reflective screen; the image is too faint to appear on the actor but shows up clearly on the screen. In this way, the actor becomes their own matte. The combined image is transmitted through the mirror and recorded by the camera. The technique is shown and explained in the "making-of" documentary of the 1972 sci-fi film Silent Running.
Front projection was invented by Will Jenkins. For this he holds U.S. patent 2,727,427, issued on December 20, 1955 for an "Apparatus for Production of Light Effects in Composite Photography" and U.S. patent 2,727,429, issued the same day for an "Apparatus for Production of Composite Photographic Effects."
It was first experimented with in 1949, shortly after the invention of Scotchlite, and had appeared in feature films by 1963, when the Japanese film Matango used it extensively for its yacht scenes. Another early appearance was in 1966, during the filming of 2001: A Space Odyssey. The actors in ape suits were filmed on a stage at Elstree Studios and combined with footage of Africa (the effect is revealed in the leopard's glowing eyes reflecting back the light). Dennis Muren used a very similar solution for his 1967 debut film Equinox, although Muren's technique didn't employ Scotchlite. Two British films released in 1969, On Her Majesty's Secret Service and The Assassination Bureau, used the technique, as did the 1968 films Barbarella and Where Eagles Dare.
Front projection was chosen as the main method for shooting Christopher Reeve's flying scenes in Superman. However, they still faced the problem of having Reeve actually fly in front of the camera. Effects wizard Zoran Perisic patented a new refinement to front projection that involved placing a zoom lens on both the movie camera and the projector. These zoom lenses are synchronized to zoom in and out simultaneously in the same direction. As the projection lens zooms in, it projects a smaller image on the screen; the camera lens zooms in at the same time, and to the same degree, so that the projected image (the background plate) appears unchanged, as seen through the camera. However, the subject placed in front of the front projection screen appears to have moved closer to the camera; thus Superman flies towards the camera. The technique is analogous to the more commonly discussed dolly zoom effect.
Perisic called this technique "Zoptic". The process was also used in two of the Superman sequels (but not used in the fourth movie due to budget constraints), Return to Oz, Radio Flyer, High Road to China, Deal of the Century, Megaforce, Thief of Baghdad, Greatest American Hero (TV), as well as Perisic's films as director, Sky Bandits (also known as Gunbus) and The Phoenix and the Magic Carpet.
Introvision is a front projection composite photography system using a pair of perpendicular reflex screens to combine two projected scenes with a scene staged live before the camera in a single shot.