Film's special effects are a type of visual effect used in filmmaking to create an illusion or enhance a scene. OPTICAL effects are one of the most common types of special effects used in films, and involve manipulating light and color to create a desired effect. Examples of OPTICAL effects include chroma key compositing, matte painting, and rotoscoping. These effects are often used to create realistic environments, characters, and objects that would otherwise be impossible to create in real life.