Movies - Sodium vapor process

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	Movies - Sodium vapor process

The sodium vapor process (ocassionally referred to as yellowscreen) was an old technique for combining actors and background footage, developed exclusively by The Walt Disney Company as an alternative to the more common bluescreen process.

An actor is filmed performing in front of a yellow screen and lit with powerful sodium vapor lights. A camera with a special prism is used to create a matte simultaneously with the color footage, so that the footage can later be combined with another shot without the two images showing through each other.

Disney reportedly made only one sodium vapor camera because only one working prism was ever produced.

The technique was used in the films Mary Poppins and Song of the South
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