During the 1920s and 1930s, special effects techniques were improved and refined by the motion picture industry. Many techniques—such as the Schüfftan process—were modifications of illusions from the theatre (such as pepper's ghost) and still photography (such as double exposure and matte compositing). Rear projection was a refinement of the use of painted backgrounds in the theatre, substituting moving pictures to create moving backgrounds. Lifecasting of faces was imported from traditional maskmaking. Along with make-up advances, fantastic masks could be created which fit the actor perfectly. As material science advanced, horror film maskmaking followed closely.
during the 1920s and 1930s special effects techniques were improved and refined by the motion picture industry many techniques—such as the schüfftan process—were modifications of illusions from the theatre (such as pepper's ghost) and still photography (such as double exposure and matte compositing) rear projection was a refinement of the use of painted backgrounds in the theatre substituting moving pictures to create moving backgrounds lifecasting of faces was imported from traditional maskmaking along with make-up advances fantastic masks could be created which fit the actor perfectly as material science advanced horror film maskmaking followed closely