Beams of light,colour filters,and electronic circuitry are used to scan a colour image point by point,producing colour-corrected separations in negative or positive film,either screened or unscreened.

• 用光束、滤色片、和电子电路把彩色影像逐点逐点的扫描，造成正确色彩的分色上网或不上网的正片或负片。