(一)使用颜色卡片
（1） Using color cards
，根据客户提供的颜色标准，由计算机配色系统给出专色油墨的比例;然后将油墨样品转移，不同密度的颜色样品由墨位计和墨棒计显示;然后根据标准(或客户)对色差范围的要求，用分光光度计测定标准、浅限、深限，制出标准色卡(色差超过标准需要进一步校正)。成都包装设计色卡的一半是普通的颜色样本，另一半是经过表面处理的颜色样本，便于质量检验。
First, according to the color standard provided by customers, the proportion of spot color ink is given by computer color matching system; then the ink samples are transferred, and the color samples with different densities are displayed by ink level meter and ink stick meter; Then, according to the requirements of national standard (or customer) on the range of color difference, the standard, shallow limit and deep limit are determined by spectrophotometer, and the standard color card is made (the color difference exceeds the standard and needs further correction). Half of the color cards of Chengdu packaging design are ordinary color samples, and the other half are color samples after surface treatment, which is convenient for quality inspection.
(二)验证专色
（2） Verify spot color
考虑到纸张是影响色差的主要因素，每次印刷前都需要用实际印刷的纸张“显示”色样，对色卡进行小的校正，纸张的影响。
Considering that the paper is the main factor affecting the color difference, it is necessary to use the actual printed paper to "display" the color sample before each printing, and carry out small correction on the color card to eliminate the influence of the paper.
(三)打印控制
（3） Print control
在包装和印刷中，本机采用印刷标准色卡来控制专色油墨层的厚度。广告海报设计还辅助用密度计测量颜色的主密度值和Bk值，以克服油墨干、湿色密度的差异。
In packaging and printing, this machine uses printing standard color card to control the thickness of spot color ink layer. In order to overcome the difference between dry and wet ink density, the main density and BK value of color are measured by densitometer.
在包装盒印刷过程中，有必要针对实际生产中出现的不同原因进行分析和解决，尽量将偏差控制在Zui的小范围内。户外广告设计生产的包装印刷产品，使客户满意。
In the process of packaging box printing, it is necessary to analyze and solve the different reasons in the actual production, and try to control the deviation in a small range of Zui. Outdoor advertising design and production of packaging and printing products, so that customer satisfaction.
