Film Term:

C.T.O. stands for Color Temperature Orange. This is an abbreviation for the color correction gels used in lighting to convert the color temperature from daylight to tungsten. They come in gradients: Quarter Orange, Half Orange, Full Orange.

Glossary of Film Terms - http://homepage.newschool.edu/~schlemoj/film_courses/glossary_of_film_terms/
reprinted with permission

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