colour separation
noun/ˈkʌlə sepəreɪʃn/
/ˈkʌlər sepəreɪʃn/
(US English color separation)
(specialist)- [countable] one of four images of something made using only the colours cyan, magenta, yellow or black. The four images containing these colours are then used together to print an image in full colour.
分色制版图片（用青、洋红、黄、黑制成的四张制版用单色图片之一） - [uncountable] the process that is used to do this
分色制版