noun
luminance signal; Y signal
Technical term in video and television engineering; the component of a video signal that carries brightness information.
輝度信号と色信号を分離して処理する。
The luminance signal and chrominance signal are processed separately.
色信号 is the chrominance signal, carrying color information, while 輝度信号 carries only brightness.
Compound of 輝度 (luminance) and 信号 (signal).