A thin, tinted plastic-like sheet placed over a light to change the colorof the projected light. Cleaning the gels is a practical joke usually givenas a job to an inexperienced crew member.
imdb Movie Terminology
A large sheet of transparent tinted plastic used as a filter for a movie light, or to cover a window. There are two basic types: ones that will covert one color temperature to another (such as C.T.O. and C.T.B.), and others that come in a wide variety of colors.
Cel Mai folosit cuvant: large | Domeniu Aplicare : Cinematografie | Caractere: 201 Cuvinte: 49 | Limba: Engleza | Sursa The Pollio Folio - Glossary of Cinematography Terms