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Estimating the amount of cyan, magenta, yellow, and black inks in arbitrary colour pictures

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Abstract

This paper is concerned with the offset lithographic colour printing. To obtain high quality colour prints, given proportions of cyan (C), magenta (M), yellow (Y), and black (K) inks (four primary inks used in the printing process) should be accurately maintained in any area of the printed picture. To accomplish the task, the press operator needs to measure the printed result for assessing the proportions and use the measurement results to reduce the colour deviations. Specially designed colour bars are usually printed to enable the measurements. This paper presents an approach to estimate the proportions directly in colour pictures without using any dedicated areas. The proportions—the average amount of C, M, Y, and K inks in the area of interest—are estimated from the CCD colour camera RGB (L*a*b*) values recorded from that area. The local kernel ridge regression and the support vector regression are combined for obtaining the desired mapping L*a*b* ⇒ CMYK, which can be multi-valued.

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Authors and Affiliations

  1. Intelligent Systems Laboratory, Halmstad University, P. O. Box 823, 301 18, Halmstad, Sweden

    Antanas Verikas & Carl-Magnus Nilsson

  2. Department of Applied Electronics, Kaunas University of Technology, Studentu 50, 51368, Kaunas, Lithuania

    Antanas Verikas & Marija Bacauskiene

Authors
  1. Antanas Verikas
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  2. Marija Bacauskiene
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  3. Carl-Magnus Nilsson
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Correspondence to Antanas Verikas.

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Verikas, A., Bacauskiene, M. & Nilsson, CM. Estimating the amount of cyan, magenta, yellow, and black inks in arbitrary colour pictures. Neural Comput & Applic 16, 187–195 (2007). https://doi.org/10.1007/s00521-006-0066-6

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  • DOI: https://doi.org/10.1007/s00521-006-0066-6

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