Movie Magic
You may also be looking for the documentary TV series, of the same name.
Movie Magic was a special effects company specializing in optical effects in existence between 1980 and 2000. They worked on a wide variety of films doing optical effects, titles, and composites.

Some movies they worked on include  ("optical effects"), Star Wars: Return of the Jedi ("additional optical effects"), Back to the Future ("opticals"), and TRON ("Additional Animation Compositing Camera").

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Production companies