A Study of Optical Brightening Agents (OBA) Correction Methods

Abstract:

Almost all papers contain optical brightening agents (OBA) in process color printing. The colorimetric value shifts toward larger negative b* as the amount of OBA in paper increases. Paper containing OBA creates problems in printing conformance because colorimetric aim points of the printing standards, e.g., ISO 12647, have not been updated. To correct for the measurement differences due to OBA effect, this research printed the IT8.7/4 target on paper with and without OBA under the same printing conditions, measured with a spectrophotometer including UV, and corrected printed color produced by paper with without OBA with a linear correction per ISO 13655 as well as an experimental polynomial model via regression. The results showed that the polynomial method corrects the measurement difference between paper with and without OBA better than the linear correction method. Specifically, 90% of color differences between uncorrected data are 4.5∆E76; the linear method can correct the difference to 2.8∆E76; and the polynomial method can correct the difference to less than 1.6∆E76.

• Periodical: Advanced Materials Research (Volume 174)
• Pages: 346-349
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.174.346
• Online since: December 2010
• Authors: Quan Hui Tian, Robert Chung
• Keywords: Color Correction Method, OBA Correction

References

[1] ISO 13655 Graphic technology-Spectral measurement and colorimetric computation for graphic arts images.

DOI: 10.3403/00951483

[2] ISO 12467-2 Graphic technology-Process control for the manufacture of half-tone color separations, proof and production prints –Parts 2.

DOI: 10.3403/02491463u

[3] David Q. McDowell, Robert Chung and Lingjun Kong: TAGA Proceedings(2005).

[4] Bob Thompson, Print Materials: Science and Technology, PIRA International(2004), pp.280-284.

[5] Brian Gamm,: TAGA Proceeding(2009).

[6] International Color Consortium: White Paper 14, Level: Intermediate, April (2005).

[7] Calabria, J., & Rich, D. C.: IS&T/SID Color Imaging Conference: Final Program and Proceedings Vol. 11(2003), pp.288-293.

[8] David Q. McDowell, USTAG and CGATS Substrate Project Description and Summary Report, USTAG N 3634(2010).