Compositing has become the umbrella description of one of the oldest techniques in film and television production, namely, the combining of two or more separate images into one unified image. The aim of the technique is to eliminate any indication in the final composite image of the join between the separate images that have been combined.
Electronic keying, using a luminance key (off black or white), was superseded by colour separation – chroma keying using a saturated colour, usually blue. Later variants such as linear keying allowed realistic semi-transparent effects such as transparent shadows and partial reflections.
The growth of digital post-production allowed enormous flexibility in rearranging, combining and manipulating ...
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