公开(公告)号：US5299291A

公开(公告)日：1994-03-29

申请号：US967055

申请日：1992-10-28

申请人： Brigitte Ruetz

发明人： Brigitte Ruetz

IPC分类号： H04N1/60 ,  G06F15/00

CPC分类号： H04N1/6058

摘要： Method and apparatus for color printing according to a printer table having high color smoothness for out-of-gamut colors. A color printer gamut edge is first determined and color primary values for colors within the printer gamut are calculated and inserted into the printer table. For transition colors, namely those colors outside the printer gamut edge but still within the printer table, color primary values are calculated by selecting a color from the printer gamut edge at a point which lies at a constant angle from the transition color in question. The same constant angle is used for each and every one of the transition colors. A border table is provided for colors outside of the printer table; the color primary values for the border table are selected in the same manner as for the transition colors. According to the invention, it is possible to provide smooth color transitions for out-of-gamut colors, and in particular it is possible to provide monotonically increasing lightness in both the printer table and the border table and thereby avoid undesirable bands of darker colors within lighter colors.

摘要翻译： 根据具有用于色域外色彩的高色平滑度的打印机台的彩色打印方法和装置。 首先确定彩色打印机色域边缘，并计算打印机色域内的颜色的颜色主要值并将其插入到打印机表中。 对于转换颜色，即打印机色域边缘之外但仍在打印机表内的那些颜色，通过从与所讨论的过渡颜色成恒定角度的点选择来自打印机色域边缘的颜色来计算颜色主要值。 每个过渡颜色都使用相同的恒定角度。 为打印机表外的颜色提供边框表; 以与过渡颜色相同的方式选择边框表的颜色主要值。 根据本发明，可以为色域外色彩提供平滑的色彩转换，特别是可以在打印机台和边界表两者中提供单调增加的亮度，从而避免不期望的较暗颜色的带内 颜色较浅

公开(公告)号：US5438649A

公开(公告)日：1995-08-01

申请号：US967050

申请日：1992-10-28

申请人： Brigitte Ruetz

发明人： Brigitte Ruetz

IPC分类号： B41J2/525 ,  G06T1/00 ,  G06T1/20 ,  G06T11/00 ,  H04N1/46 ,  H04N1/60 ,  G06F15/00

CPC分类号： H04N1/6058

摘要： Method and apparatus for color printing according to a printer table in which the hue angle of the colors in the printer table are warped so as to compensate for the Abney effect. A color printer gamut edge is first determined through printer gamut measurement, and color primary values within the printer gamut and outside the printer gamut are calculated and inserted into the printer table. If desired, a border table may be provided for colors outside the printer table. The hue angles for the printer table and the border table are then warped, for example, by stretching some ranges of hue angles and by compressing other ranges of hue angles, so that out-of-gamut colors are printed with a hue that is perceived to be the same as the hue of the desired color.

摘要翻译： 根据打印机表的彩色打印方法和装置，其中打印机台中的色调的色调角度被扭曲，以补偿阿布尼效应。 首先通过打印机色域测量确定彩色打印机色域边缘，并计算打印机色域内和打印机色域外的颜色主要值，并将其插入打印机表中。 如果需要，可以为打印机台外的颜色提供边框。 然后打印机台和边框的色调角度例如通过拉伸一些色相角范围并压缩其他色调角度范围，使得色域外的色彩以被感知的色调打印出来 与所需颜色的色调相同。

公开(公告)号：US5574666A

公开(公告)日：1996-11-12

申请号：US242234

申请日：1994-05-13

申请人： Brigitte Ruetz ,  Gesualdo Alesii ,  Timothy I. Kohler

发明人： Brigitte Ruetz ,  Gesualdo Alesii ,  Timothy I. Kohler

IPC分类号： B41J2/525 ,  B41J5/30 ,  G03F3/08 ,  G06F3/12 ,  G06T11/60 ,  H04N1/46 ,  H04N1/60

CPC分类号： H04N1/6033 ,  H04N1/6058

摘要： A method and apparatus for constructing a color printer table. Printable colors in CIELAB space are transformed to Munsell space and color mapping functions are derived which map Munsell space coordinates into primary color coordinates CMY of the printer. A Munsell printer gamut is determined by selecting points in Munsell space where the color mapping functions result within the printable primary color range. All discrete points of an extended gamut in CIELAB space are mapped into the Munsell space. The extended gamut comprises colors inside the printer gamut as well as colors outside the printer gamut, such as colors typically found in a color monitor. Primary color values are inserted into the color printer table by taking the mapped CIELAB points and applying the color mapping functions to the mapped CIELAB points that lie inside the Munsell printer gamut, and applying gamut mapping to the mapped CIELAB points in Munsell space that lie outside the Munsell printer gamut. Since the gamut mapping takes place in Munsell space, the hue is exactly preserved by simply preserving the hue angle.

摘要翻译： 一种用于构造彩色打印机表的方法和装置。 将CIELAB空间中的可打印颜色转换为Munsell空间，并导出颜色映射函数，将Munsell空间坐标映射到打印机的主色坐标CMY。 Munsell打印机色域是通过选择Munsell空间中的颜色映射功能在可打印的主要颜色范围内产生的点来确定的。 CIELAB空间中扩展色域的所有离散点都映射到孟塞尔空间中。 扩展色域包括打印机色域内的颜色以及打印机色域外的颜色，例如通常在彩色监视器中找到的颜色。 通过拍摄映射的CIELAB点并将颜色映射函数应用于位于Munsell打印机色域内的映射CIELAB点，将原色值插入到彩色打印机表中，并将色域映射应用于位于外部的Munsell空间中映射的CIELAB点 孟塞尔打印机色域。 由于色域映射发生在孟塞尔空间中，所以通过简单地保留色相角来完全保留色调。

公开(公告)号：US5500921A

公开(公告)日：1996-03-19

申请号：US956300

申请日：1992-10-05

申请人： Brigitte Ruetz

发明人： Brigitte Ruetz

IPC分类号： B41J2/525 ,  G06T1/00 ,  G06T1/20 ,  G06T11/00 ,  H04N1/46 ,  H04N1/60 ,  G06K15/00

CPC分类号： H04N1/6058

摘要： A method and apparatus for building and using tables which determine the colors to be printed from a device independent color coordinate system. Two tables are built: the first is a printer table for colors in the printer gamut as well as for colors in a typical color monitor gamut, and the second is a border table for colors outside the printer table. The printer table is constructed from a mathematically smooth mapping function for mapping from the device independent coordinate system (such as CIELAB space) to the printer coordinate system, and the mathematically smooth mapping function is determined based on a measurement of the printable colors in the device independent coordinate system. The border table is constructed so as to preserve the hue of unprintable colors but to increase saturation so as to achieve a more natural looking result. Transition colors are added to the printer table outside the printer gamut, smoothing the transition from the edge of the printer gamut to the border table. In use, either the printer table or the border table is selected based on whether the desired color in the device independent coordinate system is within the printer table or outside the printer table.

摘要翻译： 一种用于构建和使用从装置独立颜色坐标系确定要印刷的颜色的表的方法和装置。 建立了两个表：第一个是打印机色域中的颜色的打印机表以及典型颜色监视器色域中的颜色，第二个是用于打印机表外部颜色的边框。 打印机表由用于从设备独立坐标系（例如CIELAB空间）映射到打印机坐标系的数学平滑映射功能构建，并且基于对设备中的可打印颜色的测量来确定数学平滑映射功能 独立坐标系。 边框的构造是为了保持不可打印颜色的色调，同时增加饱和度，以达到更自然的外观效果。 将转换颜色添加到打印机色域外部的打印机表中，从而平滑从打印机色域边缘到边框表的过渡。 在使用中，打印机表或边框表是根据设备独立坐标系中所需的颜色是否在打印机表内或打印机表外部来选择的。