Existence of two kinds of representations of the helmholtz‐kohlrausch effect. I. the experimental confirmation

Abstract

In the representation of the Helmholtz‐Kohlrausch effect, a new method (the VCC method using variable chromatic colors) is proposed in addition to the method used so far (the VAC method using variable achromatic colors). The new VCC method showed a significantly larger Helmholtz‐Kohlrausch effect than the VAC method previously used. For practical applications, the results by the VCC method are more effective than the VAC method. Three kinds of experiments are reported for clarifying the difference in effect between the two methods. © 1994 John Wiley & Sons, Inc.

Clarification of differences between variable achromatic color and variable chromatic color methods in the Helmholtz–Kohlrausch effect

“…Figures 1, 2 Figures 1 and 2 show the principle of the VAC and VCC methods using achromatic and chromatic object colors under white illuminant. 5 In the VAC method of This simple reversal introduces significantly different observed results between the two methods, which have been reported in this journal. 6,8 It is interesting that the concept and the magnitude of the effect are significantly different between the VAC and VCC methods despite similar experimental conditions.…”

“…Since, the existence of VAC and VCC methods has been widely recognized by researchers in the field of colorimetry, but there are large differences in effect between the two methods, 5,6,8 the understanding of their concept difference is extremely important for the correct use of either method.…”

“…The effect of chromatic component contribution is closely related to the zero grayness function or the Chromatic Strengths (CS) of various spectrum lights studied by Evans. 9 -11 Theoretical formulas for predicting the H-K effect on the VAC and VCC methods are proposed by the senior author [5][6][7][8] ; they are developed introducing the fundamental concept on CS by Evans. The authors now believe that the problem has been almost solved.…”

“…[3][4][5][6][7][8] During the course of the studies, he found that two kinds of approaches existed in the H-K effect (B/L ratio and L/Y ratio effects) in 1994. 5,6 They were named the variable achromatic color (VAC) and variable chromatic color (VCC) methods. The experimental results are reported in Ref.…”

“…The experimental results are reported in Ref. 5, and their theoretical models are given in Ref. 6 using a nonlinear color-appearance model by the senior author.…”