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Volume: 29 | Article ID: art00039
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The impact of the Helmholtz-Kohlrausch effect on the appearance of near-white paper colours
  DOI :  10.2352/issn.2169-2629.2021.29.241  Published OnlineNovember 2021
Abstract

This paper investigates the impact of the Helmholtz-Kohlrausch effect on near-white substrate colours. As the luminance of the test colour (or its simulated reflectance in a softproof setup) approaches that of the adapting white point the viewing mode changes from 'surface mode' to 'aperture mode', and the appearance of the test colour becomes self-luminous. However, some substrates with optical brighteners fall close to this threshold between viewing modes, since the OBAs not only increase the perceived reflectance but also increase the H-K effect, where it is very prominent in bluish colours. For graphic arts content shown on a display system, this essentially breaks the soft-proofing paradigm. The practical application of this work relates to cross-media colour reproduction, where the lightness appearance of some substrates is not adequately described by their colorimetric values, and this may impact on choice of proofing strategies.

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Gregory High, "The impact of the Helmholtz-Kohlrausch effect on the appearance of near-white paper coloursin Proc. IS&T 29th Color and Imaging Conf.,  2021,  pp 241 - 246,  https://doi.org/10.2352/issn.2169-2629.2021.29.241

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