Scientific Research and Essays

  • Abbreviation: Sci. Res. Essays
  • Language: English
  • ISSN: 1992-2248
  • DOI: 10.5897/SRE
  • Start Year: 2006
  • Published Articles: 2748

Full Length Research Paper

Calculating cyan-magenta-yellow-black (CMYK) printer’ gray component data based on polynomial modeling

Sun Bangyong
  • Sun Bangyong
  • School of Printing and Packaging Engineering, Xi’An University of Technology, Xi’an 710048, China.
  • Google Scholar
Liu Han
  • Liu Han
  • School of Automation and Information Engineering, Xi’An University of Technology, Xi’an 710048, China.
  • Google Scholar
Zhou Shisheng
  • Zhou Shisheng
  • School of Automation and Information Engineering, Xi’An University of Technology, Xi’an 710048, China.
  • Google Scholar


  •  Received: 03 January 2013
  •  Accepted: 02 March 2013
  •  Published: 15 May 2014

Abstract

As gray color data is very important for printing quality, a method based on polynomial modeling is proposed to calculate the gray color data of different lightness. Firstly, the IT8.7/3 color target which defines input cyan-magenta-yellow-black (CMYK) signals is printed, and the corresponding CIELAB (Commission Internationale de l'Eclairage L*, a* and b*) values are obtained by a spectrophotometer with color sensors. Secondly, the polynomial regression method is used to determine the relationship between these two color spaces, in which the given CIELAB color’s CMY value is calculated. At last, as the obtained cyan-magenta-yellow (CMY) gray color may contain Chroma information due to the computational error, a new color target is developed to find the real gray colors based on the relationship above, and the final relationship between CIE-L* and CMY are obtained. In the experiment, the average color error is 2.65ΔE, which is below the printing error threshold, hence the proposed algorithm for calculating gray color data can be used in printing process.

 

Key words: Gray balance, polynomial modeling, CIELAB (Commission Internationale de l'Eclairage L*, a* and b*) color, color sensors.