【作者】 廖燕玲； 吕新广；

【Author】 LIAO Yanling,LV Xinguang Key Laboratory of Product Packaging and Logistics of Guangdong Higher Education Institutes, Jinan University,Zhuhai,China

【机构】 暨南大学广东省产品包装与物流重点实验室；

【摘要】 龟纹作为不正常的花纹,其网点按照特殊规律聚集,明暗对比强烈,破坏再现阶调,严重影响最终印刷品的质量,为此在包装印刷中抑制龟纹的产生显得尤为重要。为了有效抑制龟纹的产生就必须深入探讨影响龟纹产生的各种因素,而加网角度是影响龟纹产生的重要因素之一,因此对其的研究具有非常重要的现实意义。本文利用Photoshop图像处理软件进行仿真模拟,得到在不同加网角度配置下印刷所产生的龟纹现象,通过分析模拟图样探讨加网角度与龟纹之间的关系,同时验证实际印刷过程中所使用的加网角度是否合理,最终得出能使龟纹得到最有效抑制的加网角度。首先,利用Photoshop图像处理软件在保证其他影响龟纹产生的因素不变的情况下,模拟得到C、M、Y、K四色中任意两色组合印刷时在不同加网角度配置下所产生的龟纹图样,通过分析模拟结果得出:龟纹的大小与加网角度无关而仅与加网角度差的大小有关,加网角度差在28°和38°之间时龟纹不明显,网点整体分布较均匀。然后,通过模拟得到C、M、K三色加网角度配置印刷时所产生的龟纹图样,分析了加网的角度差及图案主色的加网角度;模拟结果证明了实际印刷中强色的加网角度配置为15°、45°、75°是合理的。更多还原

【Abstract】 Moire,an abnormal printing pattern formed by irregular screen tone,may adversely affect the printing quality and should be avoided during printing.Hence,it is necessary to understand the factors contributing to its formation.Being one of the most important factors,the effect of screen angle is discussed in this paper.To obtain the most suitable screen angle and confirm its rationality,Photoshop is used to simulate Moire patterns under different screen angle conditions and analyze the relationship between screen angles and formation of Moire pattern. When mixing two of Cyan,Magenta,Yellow,and Black colors randomly while keeping the others constant,the size of the Moire is not affected by screen angles but by the angle differences.When the difference is at 28°and 38°,Moire pattern is not obvious and the dots are evenly distributed. The screen angle difference and the screen angle of the key color are also analyzed from the Moire pattern obtained by varying screen angle between C,M,and K(Black) in the simulation study.The results show that it is reasonable to set screen angle for strong color at 15°,45°and 75°.更多还原