цветной ключ
Метод наложения изображений, позволяющий убирать все области указанного цвета с основного изображения так, что становятся видны соответствующие области фонового изображения.
[Е.С.Алексеев, А.А.Мячев. Англо-русский толковый словарь по системотехнике ЭВМ. Москва 1993]
Англо-русский словарь нормативно-технической терминологии. academic.ru. 2015.
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