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Connah, David and Bachy, Romain and Finlayson, Graham D. and Bloj, Marina (2012) Human Assignment of Grey Levels Depends on Scene Complexity. In: Predicting Perceptions: Proceedings of the 3rd International Conference on Appearance. Lulu Printing, Edinburgh UK, pp. 74-78. ISBN 978-1-4716-6869-2

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Abstract

We use a direct greyscale matching paradigm to examine the role of hue, brightness and luminance in the construction of greyscale images. Observers matched iso-luminant and iso-saturated, coloured patches by adjusting the grey-level of achromatic patches; they did this in three experimental set-ups: single-patch, two-patch, and multiple-patches. The latter were presented as cartoon-like images and abstract equivalent. Most observers assign similar grey level values to all colours in the single-patch case, but show a marked hue-dependency in two-patch and multiple-patch conditions (cartoon and abstract images). This indicates both that matches for our complex images could be predicted from two-patch settings, and that scene content does not play a role in determining grey settings. The hue-dependency of the Helmholtz Kohlrausch effect is not a strong predictor of performance for patches, but it might play a role in observer settings in more complex spatial configurations.

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