First, four continuous-tone color separation negatives for cyan, magenta, yellow and black printer are made respectively via a scanner or process camera; then, screening is done via an enlarger and four screened positives are produced.

• 先用扫描仪或制版照相机分色，得青蓝、洋红、 黄及黑版用的四张连续色调分色负片。然后用放大机或制版照相机上网，分别制成四张网点正片。