Morphing

Morphing is a special effect in motion pictures and animations that changes (or morphs) one image into another through a seamless transition. Most often it is used to depict one person turning into another through technological means or as part of a fantasy or surreal sequence. Traditionally such a depiction would be achieved through cross-fading techniques on film. Since the early 1990s, this has been replaced by computer software to create more realistic transitions.

This technique appeared notably in 1991 in the Michael Jackson music video Black Or White and in the movies Terminator 2: Judgment Day and Star Trek VI: The Undiscovered Country.