The measurement of color always includes measuring some of the gloss component as well. Not everybody is aware of that implication and many articles exist on the subject (see below). In fact a complete book is needed to cover all aspects of the color and gloss interaction. In this article I focus on the correct way to measure high gloss dark colors. Measuring colors including or excluding the gloss component can have a substantial influence on the calculated color differences and jeopardizes the agreement between visual and instrumental assessment.
After reading this article you will better understand the disagreement between color measurements and visual assessments of glossy dark colors.
A practical situation
More than once we run in to the following situation: a dark high gloss color is measured and compared to its high gloss standard. The calculated color difference seems to be much less then visually observed in e.g. a light booth. Conclusion: “color measurements give a general indication of the color differences but not the right answers”. Wrong conclusion. What is often the case is that the standard and sample colors are measured with a D/8 sphere spectrophotometer including the gloss component. And this is not representing practice. So, should you measure high gloss (dark) panels excluding the gloss component? It certainly is a possibility but there is more to say about it as we explain below.