在印刷工业中照相凹版制作方面,在凹版制成前的照相阶段,其连续色调的正片,是采用染料校色法来加厚的,胶版印刷中的彩色制版,彩色分解的正片网版和底片网版是用独特的方法——靠药品减薄修正的。这种加厚和减薄的技术,也可应用于改进照片 In the photogravure making of the printing industry, in the photographic phase prior to the intaglio printing, the positive tone of its continuous tone is thickened by the dye-based color correction method, the color plate-making in the offset printing, the positive half-color screen and the negative film Screen is a unique approach - relying on drug thinning correction. This thickened and thinned technology can also be applied to improve photos