Confusion between observation and experiment in the Helmholtz–Kohlrausch effect

Abstract

AbstractThe cause of existing misunderstanding is clarified on the Helmholtz–Kohlrausch (H–K) effect. The misunderstanding is that the effect is the same in magnitude between the variable achromatic color (VAC) and the variable chromatic color (VCC) methods. It comes from the confusion between a single observation and a complete experiment. If both methods are tested in a proper experiment with sufficient observations, then the methods do give different results. The present communication together with a previous article (Color Res Appl 2006; 31: 146–155) will clarify the differences between VAC and VCC methods. For readers' convenience, a simple and accurate experimental method is proposed for grasping the large effect of the VCC method. © 2008 Wiley Periodicals, Inc. Col Res Appl, 33, 250–253, 2008