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Computer Color Matching Procedures for Mass Colored Polypropylene

In the present investigation, attempts were made to color match mass colored polypropylene by the use of several colorimetric color matching procedures. A color matching procedure consisting of a rough match as a starting point and an iterative algorithm to achieve the exact match to any degree of accuracy was carried out. The rough match was calculated based on the Kubelka-Munk's one and two constant theories. Six different iteration procedures were utilized to achieve the exact match having ΔE2000 < 0.5. The results showed that the iterations based on Lab76 gave superior results showing the most potential for a recipe prediction system for a computer color matching procedure by giving the lowest average concentration difference, ΔCAVE, and the lowest color difference, ΔE2000, under the reference condition, i.e., D65/10°. In general and as expected, concentration predictions based on the one-constant theory were always inferior to the prediction based on the two-constant theory.