天津市印刷厂

专色配墨系统由电脑、配色软件、分光光度计、分析天平、匀墨仪、展墨仪组成。用该系统将公司经常使用的纸张、油墨的参数收入数据库中，应用配色软件对客户提供的专色进行电脑自动配色，利用分光光度计测量其CIELab值、密度值、△E，从而可以实现专色配墨的数据化管理。

Spot-color ink matching system consists of computer, color matching software, spectrophotometer, analysis balance, ink leveler, ink developer. The parameters of paper and ink often used by the company are collected in the database by this system. The spot color provided by customers is automatically matched by computer by color matching software. The CIELab value, density value and E are measured by spectrophotometer. Thus the data management of spot color matching can be realized.

目前市场上常见的分光光度计有美国X-Rite和瑞士Gretag两种品牌。不同的分光光度计，测量色差时采用的是不同的计算方法，从而会带来不同的容差。

At present, the common spectrophotometer in the market has two brands: American X-Rite and Swiss Gretag. Different spectrophotometers use different calculation methods to measure chromatic aberration, which will bring different tolerances.

二、影响专色色差的因素

Two, factors affecting spot color difference

在印刷过程中，导致专色油墨生产色差的因素很多，下面对这些因素分别进行探讨。

In the process of printing, there are many factors that lead to color difference in spot-color ink production. The following factors are discussed separately.

1、纸张对颜色的影响

1, the influence of paper on color

纸张对墨层颜色的影响主要体现在3个方面。

The influence of paper on the color of ink layer is mainly reflected in 3 aspects.

1.1 纸张白度：白度不同(或带有一定颜色)的纸张，对印刷墨层的颜色显现有不同的影响。因此，在实际生产中应尽量选用白度相同的纸张印刷，以减小纸张白度对印刷颜色的影响；

1.1 Paper whiteness: Paper with different whiteness (or with a certain color) has different effects on the color of the printing ink layer. Therefore, in order to reduce the influence of paper whiteness on printing color, the paper with the same whiteness should be selected as far as possible in actual production.