Prediction Of The Helmholtz-Kohlrausch Effect Using The Cieluv (Cie) Formula

The Helmholtz-Kohlrausch effect was predicted by using the CIELUV formula. The predictions were done to the chromatic colours in the whole chromaticity gamut including spectral colours by the Variable Achromatic Colour (VAC) and the Variable Chromatic Colour (VCC) methods. The effect of adapting-illuminance change in the perceived lightness of chromatic object colours was also taken into account in the prediction. The prediction equations by the CIELUV formula gave results quite similar to those by the equation for predicting the Helmholtz-Kohlrausch effect using the nonlinear colour-appearance model. Their computational procedures for estimating various effects are very simple and easy to use.