胶印专色油墨混合颜色光谱预测研究  

Research on Prediction of Mixed Spectra of Offset Printing Spot Color Ink

作　　者：刘易仁 万晓霞[1] 牟竟晓 史太川 Liu Yiren;Wan Xiaoxia;Mou Jingxiao;Shi Taichuan(School of Printing and Packaging,Wuhan University,Wuhan,Hubei 430079,China;Shenzhen Jinjia Group Co.,Ltd.,Shenzhen,Guangdong 518105,China)

机构地区：[1]武汉大学印刷与包装系,湖北武汉430079 [2]深圳劲嘉集团股份有限公司,广东深圳518105

出　　处：《激光与光电子学进展》2022年第7期386-394,共9页Laser & Optoelectronics Progress

基　　金：国家自然科学基金(61575147)。

摘　　要：针对传统Kubelka-Munk(K-M)理论的光谱预测模型在进行胶印专色油墨光谱预测时精度不够理想的问题,提出一种基于分段线性插值法构建基墨数据库,结合Stearns-Noechel(S-N)传递函数修正K-M模型的胶印专色油墨混合颜色光谱预测方法。研究以盛威科品牌某一系列专色油墨混合得到的64个专色作为目标色样进行训练,分别进行两色、三色、四色混合光谱预测研究,得到了3种数量基墨混合时最佳纸基权重分别为-0.5、-0.1、0.2。将最佳纸基权重代入预测模型,以CIE1976色差、CIEDE2000色差和均方根误差为评价指标,随机选取了两色、三色、四色已知配方的专色各3个进行精度检测实验。结果表明,提出的方法与传统K-M方法相比,CIE1976色差、CIEDE2000色差和均方根误差平均值分别从5.748、3.471和0.048降低到2.077、1.441和0.011。该方法相比传统K-M方法预测精度大幅提高,能够较好地实现更高精度的胶印油墨混合颜色的光谱预测。Aiming at the problem that the accuracy of the traditional Kubelka-Munk(K-M) theory spectral prediction model is not ideal when performing offset printing spot color ink spectrum prediction,a color spectrum prediction method for offset printing spot color ink is proposed by constructing a base ink database based on piecewise linear interpolation method,combined with modifying the K-M model with the Stearns-Noechel(S-N) transfer function.The study used 64 spot colors obtained by mixing a certain series of spot color inks of Siegwerk brand as the target color samples for training,carried out two-color,three-color,and four-color mixed spectrum prediction research respectively,and obtained three quantities of primary color inks when mixed.The optimal paper-based weights are-0.5,-0.1,0.2,respectively.Bringing the best paper-based weight into the prediction model,and using CIE1976 color difference,CIEDE2000 color difference and root mean square error(RMSE) as evaluation indicators,two,three,and four-color spot colors with known formulas were randomly selected for accuracy testing experiments.The experimental results show that compared with the traditional K-M method,the CIE1976 color difference,CIEDE2000 color difference and RMSE of the method proposed in this study are reduced from 5.748,3.471 and 0.048 to 2.077,1.441 and 0.011,respectively.Compared with the traditional K-M method,the prediction accuracy of this method is greatly improved,and it can better realize the spectrum prediction of the mixed color of offset printing ink with higher accuracy.

关 键 词：可见光谱 计算机配色 KUBELKA-MUNK理论 线性插值法 胶印油墨 

分 类 号：O436.2[机械工程—光学工程] TS801.8[理学—光学]