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.是什么意思_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.在線(xiàn)翻譯_英語(yǔ)_讀音_用法_例句