Abstract
The purpose of the study intended to examine the performance of color rendering based on a computerized spectrum color matching (CSCM) method derived from the Kubelka-Munk theory. In the study, we prepared 2 offset ink sets to produce 30 standard color samples sets. The target color samples were measured by spectrophotometer to compare with the predicted values calculated by the CSCM model. The results showed that average measured color difference (∆E) via CIE L*a*b* and CIE DE2000 formulas between samples and CSCM predicted values averaged 5.89, 3.72 (∆Es), 6.94, 4.22(∆Epv), respectively. The measurements were fallen out the acceptable range of the tolerance of the industrial printing standards. The verification of CFI (Curve Fit Index) test came out with the same conclusion. As a result, we found that the computerized color matching formula derived from Kubelka-Munk theory still required further fine-tuning and more in-depth analysis. In addition, the reflectance database of the ink sets was another important factor affecting the performance of computer color matching model for precise colors prediction.
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