Human color constancy in cast shadows

Morimoto, Takuma, Sato, Masayuki, Sunaga, Shoji, Uchikawa, Keiji

Bibliographic Information

Published: 2025-07

Resource Type: journal article

Rights Information

Creative Commons Attribution 4.0 International
© The Author(s) 2025

Publisher: SAGE Publications

Description

Illumination conditions inside and outside cast shadows typically differ significantly in both intensity and in chromaticity. However, our daily experiences suggest that we generally have no difficulty in stably perceiving surface color in cast shadows. In this study, two experiments were conducted to measure the extent to which color constancy holds within cast shadows. We constructed a scene with colored hexagons illuminated by two projectors simulating “sunlight” and “skylight.” Part of the scene included a cast shadow, illuminated only by the skylight, where a subjective white point was measured. We also created a condition in which a cast shadow was not perceived as a shadow. Results showed that color constancy generally holds well in shadows, and the color of skylight had varying effects depending on observers. Perceiving a cast shadow as a shadow had no effect. Overall, these findings are consistent with our daily experiences, in which we stably judge objects’ color even within cast shadows.

Journal

i-Perception

i-Perception 16 (4), 2025-07

SAGE Publications

Keywords

Details 詳細情報について

CRID: 1050024091652208384

HANDLE: 2324/7385218

ISSN: 20416695

Text Lang: en

Article Type: journal article

Data Source

IRDB

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