Hidden CGI is visual effects that are hidden in plain sight but are effectively invisible, not flashy. When you think of Hidden CGI, you probably first think about Forrest Gump, especially: the removal of Sargent Dan’s legs and the integrating of (fictional) Forrest into existing (real life) news footage to make the news clip suit the story of the film. This is Hidden CGI on a big and expensive scale.

On a small, shot-by-shot scale (which can also be costly), you may need CGI to remove unwanteds...