Chroma Key: Difference between revisions
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* At the Walt Disney Studios, [[Ub Iwerks]] developed the sodium vapor process, in which the actors were filmed against a white backdrop lit with powerful sodium lights. A special prism in the camera separated the image and exposed it simultaneously on two different film stocks: regular color film, which did not pick up the sodium light, and black and white film sensitive to sodium light, which created the matte. The process was used for most Disney productions, including ''[[Song of the South]]'', ''[[Mary Poppins]]'' and ''[[The Black Hole]]'', and was also used for ''[[The Birds]]'' and a number of [[Ray Harryhausen]] movies. Although it provided better results than blue screen, and saved time by creating the matte simultaneously with the foreground footage, the process proved too expensive and was discontinued by the 1980s.
* Used a bit in ''[[Who Framed Roger Rabbit?]]'', as you can see [http://www.youtube.com/watch?v=u_VnHAy1Vdc here].
* In the ''[[Harry Potter (film)|Harry Potter]]'' films, the invisibility cloak is, of course, created with a chroma key green cloak. Chroma key is obviously also used for scenes with [[Flying Broomstick]]s and so forth. As as far as sets go, the ''Potter'' filmmakers tend to prefer building real sets and usually just use chroma key to fill in scenery out a window, for example. However, there have been at least two all-CGI sets in the series, the [http://www.youtube.com/watch?v=dVxh9AYZZs8 Hall of Prophecy] from ''[[Harry Potter and the Order of the Phoenix (film)|Harry Potter and the Order of the Phoenix]]'' (because they couldn't do the scene where all the shelves crash down for real) and the Chamber of Secrets in ''[[Harry Potter and the Deathly Hallows
* As mentioned above, [[Ray Harryhausen]] used the sodium vapor process on a number of his films. For instance, it's used to achieve some of the scale effects in ''The Three Worlds of Gulliver''. More subtly, in ''[[Jason and the Argonauts]]'', in the scene where Jason is talking to Medea at the stern of the ''Argo'', you have to look closely to realize that they were filmed in the studio with location footage of the rest of the ship matted in behind them.
* In ''[[Chitty Chitty Bang Bang]]'', blue screen was obviously used for the [[Flying Car]] scenes. Obvious because [[Special Effects Failure|you can see blue matte lines around the actors in several shots]].
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