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公开(公告)号：DE69411340T2
公开(公告)日：1998-12-17
申请号：DE69411340
申请日：1994-07-19
Applicant: XEROX CORP
Inventor： COLEMAN ROBERT M , TASCA SANDRA E , HANNA THOMAS , GREEN LELAND D , HAINS CHARLES M , CHAI STEPHEN T
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公开(公告)号：DE69628401T2
公开(公告)日：2004-01-15
申请号：DE69628401
申请日：1996-12-20
Applicant: XEROX CORP
Inventor： COLEMAN ROBERT M
Abstract: 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.
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公开(公告)号：DE69628809T2
公开(公告)日：2003-12-18
申请号：DE69628809
申请日：1996-12-20
Applicant: XEROX CORP
Inventor： COLEMAN ROBERT M
Abstract: A digital color printing method and system is described which automatically detects when a black object is commanded to be printed, and changes the composition of the black color depending on the presence or absence of non-black colorants in the background color at the position on the page at which the edge of the black object is commanded to be printed. A single-color black object which is commanded to be printed at a position in which there is a previously rendered color background which contains non-black colorants will automatically have the composition of its black color changed from single-color black to process black composed of black plus non-black colorants such as cyan, magenta, and yellow. Conversely, a process black object which is commanded to be printed at a position in which the background does not contain non-black colorants will automatically have the composition of the black changed from process black to single-color black. For many printing systems the resulting prints exhibit fewer visual defects. Black objects printed on top of a color field are printed as process black and thereby exhibit a greater density and gloss and show fewer problems caused by the misregistration of separations or other printer defects, such as white fringes around the black objects. Conversely, black objects not on a color background are printed as single-color black objects and therefore do not exhibit objectionable process black problems such as color fringing, excessive colorant, and excessive gloss contrast with the background.
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4.发明公开
公开(公告)号：EP0782097A3
公开(公告)日：1998-05-06
申请号：EP96309340
申请日：1996-12-20
Applicant: XEROX CORP
Inventor： COLEMAN ROBERT M
CPC classification number: H04N1/6022 , G06K15/102 , G06K2215/0094
Abstract: 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.
Abstract translation: 描述了一种数字彩色打印方法和系统，其自动检测何时命令打印中性灰色对象，并根据中性灰色对象的先前值以及是否存在非中性灰色对象来改变中性色的组成， 在中性物体被命令打印的页面上的位置处以背景颜色显示黑色着色剂。 被命令在其中存在包含非黑色着色剂的先前呈现的颜色背景的位置打印的单色中性对象可以自动地将其中性色从单色中性改变为包含至少一个中性色 一种非黑色着色剂，例如青色，品红色或黄色，所述方法中性选择为具有与先前的单色中性值相等的视觉密度和中性。 相反，被命令在背景不包含非黑色着色剂的位置打印的过程中性灰色物体可以自动地具有从过程中性改变为单色中性的中性色，所述单色中性选择为 具有与过程中性相同的视觉密度。 对于许多印刷系统而言，所得到的印刷品具有较少的视觉缺陷 打印在色域顶部的中性物体被打印为过程中性，因此可以显示出更大的光泽度并且显示由分离或其他打印机缺陷（例如中性物体周围的白色边缘）的配准不良造成的问题更少。 相反，不在彩色背景上的中性物体被打印为单色中性物体，因此不会出现令人反感的过程中性问题，例如色边，过度的着色剂以及与背景的过度光泽对比。
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5.发明公开
公开(公告)号：EP0782098A3
公开(公告)日：1998-05-06
申请号：EP96309342
申请日：1996-12-20
Applicant: XEROX CORP
Inventor： COLEMAN ROBERT M
CPC classification number: G06K15/02 , G06K2215/0094
Abstract: A digital color printing method and system is described which automatically detects when a black object is commanded to be printed, and changes the composition of the black color depending on the presence or absence of non-black colorants in the background color at the position on the page at which the edge of the black object is commanded to be printed. A single-color black object which is commanded to be printed at a position in which there is a previously rendered color background which contains non-black colorants will automatically have the composition of its black color changed from single-color black to process black composed of black plus non-black colorants such as cyan, magenta, and yellow. Conversely, a process black object which is commanded to be printed at a position in which the background does not contain non-black colorants will automatically have the composition of the black changed from process black to single-color black. For many printing systems the resulting prints exhibit fewer visual defects. Black objects printed on top of a color field are printed as process black and thereby exhibit a greater density and gloss and show fewer problems caused by the misregistration of separations or other printer defects, such as white fringes around the black objects. Conversely, black objects not on a color background are printed as single-color black objects and therefore do not exhibit objectionable process black problems such as color fringing, excessive colorant, and excessive gloss contrast with the background.
Abstract translation: 描述了一种数字彩色打印方法和系统，其自动检测黑色物体何时被命令打印，并且根据在黑色物体的位置上的背景颜色中是否存在非黑色着色剂而改变黑色的组成 指定黑色物体的边缘打印的页面。 命令在具有包含非黑色着色剂的先前渲染的颜色背景的位置上打印的单色黑色物体将自动将其黑色的组成从单色黑色改变为由黑色组成的黑色 黑色加上非黑色着色剂，如青色，品红色和黄色。 相反，命令在背景不包含非黑色着色剂的位置打印的处理黑色物体将自动地将黑色的组成从处理黑变为单色黑色。 对于许多印刷系统，所得到的印刷品表现出较少的视觉缺陷。 打印在色域顶部的黑色物体印刷为黑色，从而表现出更大的密度和光泽度，并且显示出由于分离或其他打印机缺陷（例如黑色物体周围的白色条纹）引起的不正确的问题。 相反，不在彩色背景上的黑色物体印刷为单色黑色物体，因此不会出现令人反感的过程黑色问题，例如色彩斑点，过度着色剂和与背景的过度光泽对比度。
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Patent Agency Ranking
公开(公告)号：DE69730268D1
公开(公告)日：2004-09-23
申请号：DE69730268
申请日：1997-05-23
Applicant: XEROX CORP
Inventor： COLEMAN ROBERT M
Abstract: A digital color printing method and system is described which automatically determines a mixture of colorants to compose a foreground color (S463) such as process black, taking into account relevant printing characteristics of a color printer (S462) and the background color (S461) at the point on the page at which the process black is to be printed. In certain printing systems, printing problems can occur when process black, composed of a mixture of colorants such as cyan, magenta, yellow, and black, is printed over a color background. For example, in a xerographic color printing system, a process black containing all colorants at maximum or near-maximum value can sometimes produce objectionable deletions in a surrounding color field, caused by interference in the transfer of toner to the background color field due to the process black toner pile height. Excessive combined toner pile height can also create an unevenness in the final print. Similarly, ink jet color printing systems can experience smearing and spreading due to excessive ink coverage when printing four-color process blacks. A system is described which automatically detects objects commanded to be printed as process black and recalculates the composition of the process black (S463) based on both the background color (S461) the current position on the page and a predetermined set of tolerances (S462) for a particular printer.
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公开(公告)号：DE69628809D1
公开(公告)日：2003-07-31
申请号：DE69628809
申请日：1996-12-20
Applicant: XEROX CORP
Inventor： COLEMAN ROBERT M
Abstract: A digital color printing method and system is described which automatically detects when a black object is commanded to be printed, and changes the composition of the black color depending on the presence or absence of non-black colorants in the background color at the position on the page at which the edge of the black object is commanded to be printed. A single-color black object which is commanded to be printed at a position in which there is a previously rendered color background which contains non-black colorants will automatically have the composition of its black color changed from single-color black to process black composed of black plus non-black colorants such as cyan, magenta, and yellow. Conversely, a process black object which is commanded to be printed at a position in which the background does not contain non-black colorants will automatically have the composition of the black changed from process black to single-color black. For many printing systems the resulting prints exhibit fewer visual defects. Black objects printed on top of a color field are printed as process black and thereby exhibit a greater density and gloss and show fewer problems caused by the misregistration of separations or other printer defects, such as white fringes around the black objects. Conversely, black objects not on a color background are printed as single-color black objects and therefore do not exhibit objectionable process black problems such as color fringing, excessive colorant, and excessive gloss contrast with the background.
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公开(公告)号：DE69628401D1
公开(公告)日：2003-07-03
申请号：DE69628401
申请日：1996-12-20
Applicant: XEROX CORP
Inventor： COLEMAN ROBERT M
Abstract: 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.
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公开(公告)号：DE69730268T2
公开(公告)日：2004-12-30
申请号：DE69730268
申请日：1997-05-23
Applicant: XEROX CORP
Inventor： COLEMAN ROBERT M
Abstract: A digital color printing method and system is described which automatically determines a mixture of colorants to compose a foreground color (S463) such as process black, taking into account relevant printing characteristics of a color printer (S462) and the background color (S461) at the point on the page at which the process black is to be printed. In certain printing systems, printing problems can occur when process black, composed of a mixture of colorants such as cyan, magenta, yellow, and black, is printed over a color background. For example, in a xerographic color printing system, a process black containing all colorants at maximum or near-maximum value can sometimes produce objectionable deletions in a surrounding color field, caused by interference in the transfer of toner to the background color field due to the process black toner pile height. Excessive combined toner pile height can also create an unevenness in the final print. Similarly, ink jet color printing systems can experience smearing and spreading due to excessive ink coverage when printing four-color process blacks. A system is described which automatically detects objects commanded to be printed as process black and recalculates the composition of the process black (S463) based on both the background color (S461) the current position on the page and a predetermined set of tolerances (S462) for a particular printer.
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公开(公告)号：BR9801874A
公开(公告)日：1999-10-19
申请号：BR9801874
申请日：1998-03-20
Applicant: XEROX CORP
Inventor： COLEMAN ROBERT M
Abstract: A method is described for printing a colorant controlled neutral black object in a bitmap-based digital color printing system. The method is useful in systems where the black colorant is not sufficiently opaque to hide non-neutral combinations of non-black colorants mixed into the black color. Black colors in a color printing system can be composed either of black colorant only or of black plus non-black colorants such as cyan, magenta, and yellow. If the non-black colorants are not mixed in nearly equal quantities, they will add hue to the black color. A sufficiently opaque black colorant can hide this objectionable non-black hue. However, in cases where the black colorant is not opaque enough, it is important to use equal or nearly equal combinations of cyan, magenta, and yellow so that little net hue will be introduced into the black color. Equally important in some printing systems is the ability to control the amount of total colorant used in forming a process black color. The invention proposes an efficient method for producing a colorant controlled, neutral black color when merging a black object into a color background for printing. The method involves reading the existing non-black background bits into a buffer, mixing them together and masking them to reduce the total colorant amount, or counting the ON bits and choosing a table entry based on this total, and outputting them again to the bitmap for printing.
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