公开(公告)号：EP1150845A4

公开(公告)日：2002-08-07

申请号：EP99961842

申请日：1999-11-29

申请人： LEXMARK INT INC

发明人： HUANG XUAN-CHAO ,  NYSTROM BRANT DENNIS

IPC分类号： B41J2/21 ,  H04N1/40 ,  H04N1/407 ,  B41J2/205 ,  G03F3/08 ,  H04N1/21 ,  H04N1/23

CPC分类号： B41J2/21 ,  B41J2/2056 ,  B41J2/211 ,  H04N1/40087 ,  H04N1/4078

摘要： A device and method of printing a color image using a lookup table that indicates the amount of at least two concentrations of a given ink color to use. Initially, several color wedges made from uniformly distributed digital counts for each color from lightest to darkest are printed. The color lightness value for each wedge is then measured as an L* value of the CIELAB system along with a granularity value. An interpolation process (210) is then performed to determine the color lightness values and granularity values for color values between wedges. A diluted ink minimum color lightness point is identified by determining the darkest color that can be generated using only diluted ink. Ink patterns are then selected using only diluted ink for color lightness values lighter than the diluted ink minimum lightness point in the lookup table (260). A zero diluted ink starting point is then identified by determining that granularity improvement cannot be achieved significantly when adding more diluted ink to a pixel matrix. Ink patterns are then selected using a mixture of diluted and saturated ink that gives a print image within a predetermined percentage of a target color lightness value and within a predetermined percentage of the granularity of the pixel matrix using an optimum amount of diluted ink. Finally, ink patterns are selected using only saturated ink for color lightness values darker than the zero diluted ink starting point in the look up table (260).

摘要翻译： 的装置和使用查找表做打印彩色图像的方法指示给定的墨水颜色使用的至少两种浓度的量。 最初，从一致提出了若干颜色楔分布式数字计数为每种颜色从最轻到最暗被打印。 然后为每个楔的颜色亮度值被测量为具有粒度值沿CIELAB系统的L *值的。 然后内插处理被执行以确定矿的颜色亮度值和粒度值楔形之间的颜色值。 稀释的油墨最小亮度点的颜色被识别BY确定性采矿，可以仅使用稀释墨水来产生最暗的颜色。 然后墨图案为颜色亮度值比在查找表中的稀释油墨最小亮度点打火机仅使用稀释的墨中选择。 然后，零稀释油墨起点被识别BY确定性挖掘做了改进粒度不能显着表现当加入更多的稀释油墨的像素矩阵。 然后油墨图案使用的稀释的混合物中的和饱和的油墨做了目标色彩亮度值的预定百分比之内，并使用在稀释油墨的最佳量的像素矩阵的粒度的预定百分比之内给出了一个打印图像。 最后，墨图案为颜色亮度值大于在查找表中的零稀释油墨起点较暗仅使用饱和墨选择。

公开(公告)号：EP1409259A4

公开(公告)日：2007-10-10

申请号：EP02706117

申请日：2002-01-30

申请人： LEXMARK INT INC

发明人： HUANG XUAN-CHAO ,  NYSTROM BRANT DENNIS ,  REEL RICHARD LEE

IPC分类号： B41M5/00 ,  C09D11/00 ,  H04N1/60 ,  B41J2/21 ,  B41J2/205 ,  B41J2/47 ,  G03F3/08

CPC分类号： B41J2/205 ,  B41M5/00 ,  C09D11/40 ,  H04N1/6022

摘要： Data in only three colors is printed in the three colors plus black. The coverage amount represented by the smallest intensity of the three colors is determined. When that amount is above a predetermined value at which observable grain becomes minimal, an exponent value is determined and a formula is followed. As an additional improvement, lightness is redefined on a model which favors less black at the lighter values and more balck at the darker values. Hue is to remain the same, ans is known from the original color data. The chroma is refined based on the original chroma, CMY, and CMYK full gamut boundaries. Since black, lightness, chroma and hue are known, the new three color values are found by known techniques.

摘要翻译： 只有三种颜色的数据以三种颜色加黑色印刷。 确定由三种颜色的最小强度表示的覆盖量。 当该量高于可观察晶粒变得最小的预定值时，确定指数值并遵循公式。 作为一个额外的改进，亮度被重新定义在一个模型上，在较弱的值下更少的黑色，而在较暗的值下更黑。 色相保持不变，并从原始颜色数据中得知。 色度根据原始色度，CMY和CMYK全色域边界进行细化。 由于黑色，亮度，色度和色相是已知的，所以通过已知的技术可以找到新的三色值。