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Proceedings Paper

Colour perception with changes in levels of illumination
Author(s): Kwame F. Baah; Phil Green; Michael Pointer
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Paper Abstract

The perceived colour of a stimulus depends on the conditions under which it is viewed. For colours employed as an important cue or identifier, such as signage and brand colours, colour reproduction tolerances are critically important. Typically, such stimuli would be judged using a known level of illumination but, in the target environment, the level of illumination used to view the samples may be entirely different. The effect of changes in the viewing condition on the perceptibility and acceptability of small colour differences should be understood when such tolerances and associated viewing conditions, are specified. A series of psychophysical experiments was conducted to determine whether changes in illumination level significantly alter acceptability and perceptibility thresholds of uniform colour stimuli. It was found that perceived colour discrimination thresholds varied by up to 2.0 ΔE00. For the perceptual correlate of hue however, this value could be of significance if the accepted error of colour difference was at the threshold, thereby yielding the possibility of rejection with changes in illumination level. Lightness and chroma on the other hand, exhibited greater tolerance and were less likely to be rejected with illuminance changes.

Paper Details

Date Published: 24 January 2012
PDF: 7 pages
Proc. SPIE 8292, Color Imaging XVII: Displaying, Processing, Hardcopy, and Applications, 829207 (24 January 2012); doi: 10.1117/12.909109
Show Author Affiliations
Kwame F. Baah, Dept. of Health (United Kingdom)
Univ. of the Arts, London (United Kingdom)
Phil Green, Univ. of the Arts, London (United Kingdom)
Michael Pointer, Univ. of the Arts, London (United Kingdom)

Published in SPIE Proceedings Vol. 8292:
Color Imaging XVII: Displaying, Processing, Hardcopy, and Applications
Reiner Eschbach; Gabriel G. Marcu; Alessandro Rizzi, Editor(s)

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