Journal of Computer Applications

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Study on color space conversion from CMYK to L*a*b*

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  • Received:2007-07-16 Revised:2007-09-30 Online:2008-01-01 Published:2008-01-01
  • Contact: Cong-Jun Cao

CMYK到L*a*b*色彩空间转换的研究

曹从军 周明全 康一   

  1. 西北大学;西安理工大学 北京师范大学;西北大学 青岛科技大学
  • 通讯作者: 曹从军

Abstract: Color space conversion is the key technology in color management,direct quality-detection of printing images and color separation. Therefore, it is very important to find out a accurate and practical transform from CMYK to L*a*b*. In this paper the dot colorimetric plane of four-color halftone printing based on optic phenomena was verified by the standard printing. Then the equation of transition from CMYK to L*a*b* was modeled by analyzing the colorimetric values of process printing patches based on mathematic statistical method and numerical analysis method. And its precision was discussed and the main reasons that influence the equation precision were analyzed.

Key words: CMYK - L*a*b*conversion, colorimetric plane, color space, process printing

摘要: 为了满足色彩复制一致性和预期性要求,寻找一种精确实用的L*a*b*与CMYK转换方法尤为重要。本文利用数理统计的二元线性回归方法在建立CMY到L*a*b*的转换模型的基础上,验证了网点呈色平面规律同样适用四色印刷,并通过最小二乘及数值分析的方法拟和各四色平面方程系数建立了CMYK到L*a*b*转换模型。随后对模型进行精度验证并修正,分析误差产生的原因,最终得到比较精确的模型。

关键词: CMYK-L*a*b*的转换, 色度平面, 颜色空间, 网点印刷