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A brief analysis of the general principles of color sequence for brochure printing

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    宣传册印刷的色彩是由具有不同色相的油墨叠印而成,叠印油墨的次序称为宣传册印刷色序。根据排列组合原理,四色(黄、品红、青、黑)宣传册印刷可以有24种不同的宣传册印刷色序,但只有选择其中符合叠印规律的宣传册印刷色序,才能使宣传册印刷品的色彩更接近于原稿才能使图像层次清楚、网点清晰,实现正确的灰平衡。但由于相互叠印、油墨本身的缺陷以及纸张质量等方面的因素,不同的宣传册印刷色序直接影响宣传册印刷品质量。所以,科学合理地安排宣传册印刷色序,才能获得正确、柔和、层次丰富以及色调正确的优质宣传册印刷品,满足客户的需求。

   宣传册印刷色序的一般原则:

   1、根据原稿的内容和特点确定宣传册印刷色序。一般以暖色调为主的宣传册印刷品,如人物画等先印青、黑、后印品红、黄;以冷色调为主的宣传册印刷品,如雪景画、风景画等,先印红,后印青。

   2、以文字和黑色实地为主的宣传册印刷品,宣传册印刷色序一般采用青、品红、黄、黑。但不能在黄色实地上宣传册印刷黑色文字及图案,因为黄色油墨黏度小,黑色油墨黏度大,容易产生逆套印现象,造成黑色油墨印不上或印不实。

  3、宣传册印刷根据网点覆盖面积的大小确定宣传册印刷色序。一般情况下,网点覆盖面积小的先印,网点覆盖面积大的后印。

   4、根据平网和实地排列宣传册印刷色序。宣传册印刷品有平网和实地时,为获得好的宣传册印刷质量,避免纸张交接过程中产生蹭脏问题,使实地平服、墨色鲜艳厚实,一般先印平网图文,后印实地。

   5、根据机型列宣传册印刷色序。单色机和多色机由于叠印状态不同(前者为湿叠干,后者为湿叠湿),宣传册印刷色序的安排也有所不同。一般情况下,单色机和双色机的宣传册印刷色序以明暗色相互交替为宜,四色宣传册印刷机一般先印暗色,后印亮色。

   6、根据纸张的性质排列色序。各种纸张的平沉滑度、白度、纤维松散度、表面强度和吸墨性不同,对于吸墨性好的纸张,先印暗色,后印亮色;对于吸墨性差的纸张,先印亮色,后印暗色,因为像黄墨这样的亮色油墨可以遮盖掉毛、掉粉等纸张缺陷。在炎热的夏天,当用白纸印单色时,如果遇到纸张含水量不均匀,皱褶不平整,纸张表面强度差而引起纸张掉毛和掉粉等情况,可采用先印一道水

的措施。

   7、根据三原色油墨的明度排列宣传册印刷色序。油墨的明度反映在油墨的分光光度曲线上,反射率越高,油墨的明度越高。三原色油墨明度的排列顺序为黄>青>品红>黑。

   8、根据三原色油墨的透明度和遮盖力排列宣传册印刷色序。油墨的透明度和遮盖力取决于颜料和连结料的折光率之差。遮盖力较强的油墨对叠印后的色彩影响较大,如果后印就不易显出正确的色彩,达不到好的混色效果。所以一般来讲,透明度差的油墨先印,透明度强的油墨后印。

   9、根据油墨的干澡性排列宣传册印刷色序。实践证明,黄墨比品红的干燥速度快近两倍,品红墨比青墨快一倍。黑墨固着最慢。干性慢的油墨应先印,干燥快的油墨后印。单色机叠印为防玻璃化,一般最后印黄色以加速结膜干燥。

  10、根据油墨的黏度确定宣传册印刷色序。单色机是在第一色干燥后再叠印第二色,而多色机是湿压湿套印,因此应当控制好油墨的黏度和下墨量,黏度大的油墨先印,黏度小的油墨后印。

   11、根据深、浅色排列宣传册印刷色序。为使宣传册印刷品具有一定的光泽,当遇到要加印浅色的情况时,先印深色,后印浅色。

   12、宣传册印刷根据套合特点确定宣传册印刷色序。双色机印四色时应尽可能选择两色套合紧密的先印,套合要求不高的两色后印。

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