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Color printing yielding a background dependent neutral gray image (i.e. intelligent gray)

机译:彩色打印产生背景相关的中性灰色图像(即智能灰色)

摘要

A digital color printing method and system is described which automatically detects when a neutral grey object is commanded to be printed, and changes the composition of the neutral color depending on the previous value of the neutral grey object and on the presence or absence of non-black colorants in the background color at the position on the page at which the neutral object is commanded to be printed. A single-color neutral object which is commanded to be printed at a position in which there is a previously rendered color background which contains non-black colorants may automatically have its neutral color changed from a single-color neutral to a process neutral containing at least one non-black colorant such as cyan, magenta, or yellow, said process neutral chosen to have equivalent visual density and neutrality as the previous single-color neutral value. Conversely, a process neutral grey object which is commanded to be printed at a position in which the background does not contain non-black colorants may automatically have the neutral color changed from process neutral to single-color neutral, said single-color neutral chosen to have the equivalent visual density as the process neutral. For many printing systems the resulting prints exhibit fewer visual defects. Neutral objects printed on top of a color field are printed as process neutral and thereby may exhibit a greater gloss and show fewer problems caused by the misregistration of separations or other printer defects, such as white fringes around the neutral objects. Conversely, neutral objects not on a color background are printed as single-color neutral objects and therefore do not exhibit objectionable process neutral problems such as color fringing, excessive colorant, and excessive gloss contrast with the background.
机译:描述了一种数字彩色打印方法和系统,该方法和系统自动检测何时命令打印中性灰色物体,并根据中性灰色物体的先前值以及是否存在非灰阶来改变中性色的成分。在命令打印中性对象的页面位置上,使用背景色的黑色着色剂。被命令在先前渲染的包含非黑色着色剂的彩色背景的位置上打印的单色中性对象可能会自动将其中性颜色从单色中性更改为至少包含至少一个过程中性的颜色一种非黑色着色剂,例如青色,品红色或黄色,所述过程中性被选择为具有与先前的单色中性值相同的视觉密度和中性。相反,被命令打印在背景不包含非黑色着色剂的位置的过程中性灰色对象可能会自动将中性颜色从过程中性更改为单色中性,所述单色中性选择为具有与过程中性等效的视觉密度。对于许多印刷系统,所得印刷品显示较少的视觉缺陷。在色域顶部打印的中性对象将作为过程中性对象进行打印,因此可以表现出更高的光泽度,并且显示出更少的由分离不正确或其他打印机缺陷引起的问题,例如中性对象周围的白色条纹。相反,不在彩色背景上的中性对象被打印为单色中性对象,因此不会表现出令人讨厌的过程中性问题,例如彩色条纹,过多的着色剂和与背景的过度光泽对比。

著录项

  • 公开/公告号US6275302B1

    专利类型

  • 公开/公告日2001-08-14

    原文格式PDF

  • 申请/专利权人 XEROX CORPORATION;

    申请/专利号US19950579385

  • 发明设计人 ROBERT M. COLEMAN;

    申请日1995-12-27

  • 分类号G06K150/00;

  • 国家 US

  • 入库时间 2022-08-22 01:03:34

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