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Proceedings Paper

Color universal design: analysis of color category dependency on color vision type (3)
Author(s): Natsuki Kojima; Yasuyo G. Ichihara; Tomohiro Ikeda; Miyuki G. Kamachi; Kei Ito
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Paper Abstract

We report on the results of a study investigating the color perception characteristics of people with red-green color confusion. We believe that this is an important step towards achieving Color Universal Design. In Japan, approximately 5% of men and 0.2% of women have red-green confusion. The percentage for men is higher in Europe and the United States; up to 8% in some countries. Red-green confusion involves a perception of colors different from normal color vision. Colors are used as a means of disseminating clear information to people; however, it may be difficult to convey the correct information to people who have red-green confusion. Consequently, colors should be chosen that minimize accidents and that promote more effective communication. In a previous survey, we investigated color categories common to each color vision type, trichromat (C-type color vision), protan (P-type color vision) and deuteran (D-type color vision). In the present study, first, we conducted experiments in order to verify a previous survey of C-type color vision and P-type color vision. Next, we investigated color difference levels within "CIE 1976 L*a*b*" (the CIELAB uniform color space), where neither C-type nor P-type color vision causes accidents under certain conditions (rain maps/contour line levels and graph color legend levels). As a result, we propose a common chromaticity of colors that the two color vision types are able to categorize by means of color names common to C-type color vision. We also offer a proposal to explain perception characteristics of color differences with normal color vision and red-green confusion using the CIELAB uniform color space. This report is a follow-up to SPIE-IS & T / Vol. 7528 7528051-8 and SPIE-IS & T /vol. 7866 78660J-1-8.

Paper Details

Date Published: 24 January 2012
PDF: 8 pages
Proc. SPIE 8292, Color Imaging XVII: Displaying, Processing, Hardcopy, and Applications, 829206 (24 January 2012); doi: 10.1117/12.907669
Show Author Affiliations
Natsuki Kojima, Kogakuin Univ. (Japan)
Yasuyo G. Ichihara, Kogakuin Univ. (Japan)
NPO Color Universal Design Organization (Japan)
Tomohiro Ikeda, Kogakuin Univ. (Japan)
Miyuki G. Kamachi, Kogakuin Univ. (Japan)
Kei Ito, The Univ. of Tokyo (Japan)
NPO Color Universal Design Organization (Japan)

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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