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首页> 外文会议>Conference on Color Imaging: Device-Independent Color, Color Hardcopy, and Graphic Arts Ⅵ Jan 23-26, 2001, San Jose, USA >Visually-based color space tetrahedrizations for printing with custom inks
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Visually-based color space tetrahedrizations for printing with custom inks

机译：基于视觉的色彩空间四面体化，可使用定制墨水进行打印

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摘要

Printing with custom inks is useful for extending the gamut of printed images, for creating artistically appealing designs or for providing protection against counterfeiting (security documents). The basic colors we consider, consist of the custom inks, their superpositions and the white paper. Color separation for custom inks requires to determine the relative amounts of the basic colors allowing to render each desired input color. To achieve this goal, one may tetrahedrize the set of basic colors on a given 3D color space. However, even for a few basic colors, there are many different tetrahedrizations (for example with 8 points in 3D space, one may build more than 120 different tetrahedrizations). When printed at a very high resolution, i.e. when screen dots are not visible, different tetrahedrizations yield halftoned color images which look similar. However, in the case of large screen tiles or for sophisticated screens, the dither patterns may remain visible. When the halftone patterns are visible, certain tetrahedrizations yield well-behaved regular halftone patterns whereas other tetrahedrizations tend to create false contours due to successions of high and low frequency halftone patterns . We show that the standard Delaunay tetrahedrization yields visually poor results: transitions between tetrahedra with vertices having high luminance differences (CIE-LAB DELTA L) and tetrahedra with vertices having low luminance differences yield false contours. In the present paper, we experiment with various criteria for choosing the tetrahedrization yielding the least amounts of visual artifacts (false contours). Such criteria comprise the selection of tetrahedrizations which either (1) maximize the mean CE-LAB DELTA L value within the tetrahedra; (2) maximize the variance in DELTA L (Var_(DELTA L)) within the tetrahedra; (3) constrain a maximum number of tetrahedra to have as a common edge the line connecting the darkest with the brightest basic color; or (4) constrain a maximum number of tetrahedra to have as one common vertex the darkest basic color. The results are illustrated with color wedges~a crossing the printing gamut of the given custom inks.
机译：使用定制墨水进行打印对于扩展打印图像的色域，创建具有艺术吸引力的设计或提供防伪保护（安全文件）很有用。我们考虑的基本颜色包括自定义墨水，它们的叠加和白皮书。定制墨水的颜色分离需要确定允许呈现每种所需输入颜色的基本颜色的相对数量。为了实现这一目标，可以在给定的3D颜色空间上对一组基本颜色进行四面体化。但是，即使对于一些基本颜色，也存在许多不同的四面体化（例如，在3D空间中有8个点，一个可能会构建超过120种不同的四面体化）。当以非常高的分辨率打印时，即在看不见屏幕点时，不同的四面体化会生成看起来类似的半色调彩色图像。但是，在大屏幕拼贴或复杂屏幕的情况下，抖动图案可能仍然可见。当半色调图案可见时，某些四面体化会产生良好的规则半色调图案，而其他四面体化会由于高频和低频半色调图案的连续而产生虚假的轮廓。我们显示标准的Delaunay四面体化在视觉上产生较差的结果：具有高亮度差的顶点（CIE-LAB DELTA L）和具有低亮度差的顶点的四面体之间的过渡会产生错误的轮廓。在本文中，我们尝试使用各种标准选择四面体化，以产生最少的视觉伪像（错误轮廓）。这样的标准包括选择四面体化，其（1）使四面体内的平均CE-LAB DEL L值最大化； （2）使四面体内的DELTA L（Var_（DELTA L））的方差最大化； （3）限制最大数量的四面体，以将连接最暗和最亮基色的线作为公共边缘；或（4）限制最大数量的四面体将最暗的基本颜色作为一个共同顶点。用与给定的自定义油墨的印刷色域交叉的颜色楔形来说明结果。

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