A Study on Visibility Rating of Several Representative Web-Safe Colors

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  • Saito Daisuke
    Research Center for Advanced Technologies, Tokyo Denki University
  • Saito Keiichi
    Research Center for Advanced Technologies, Tokyo Denki University
  • Notomi Kazuhiro
    Department of Information and Computer Sciences, Kanagawa Institute of Technology
  • Saito Masao
    Research Center for Advanced Technologies, Tokyo Denki University

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  • Ｗｅｂセーフカラーの視認性順序付けに関する検討
  • Web セーフカラー ノ シニンセイ ジュンジョ ヅケ ニ カンスル ケントウ

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This paper presents the visibility ordering of several web-safe colors. The research of web site visibility is important because of the rapid dissemination of the World Wide Web. The combination of a foreground color and a background color is an important factor in providing sufficient visibility. Therefore, the rating of color combination visibility is necessary when developing accessible web sites. In this study, the visibility of several web-safe color combinations was examined using psychological methodology, i.e., a paired comparison. Eighteen chromatic web-safe colors were employed for visual stimuli. Nine students ranging from ages 21 to 29 (average 23.7) were recruited, and all were with normal color sensation. These nine subjects looked at two different colored characters simultaneously on the white background and were instructed to identify which one enabled them to see more clearly. In examining the relationship between the psychological rankings of the color combinations and the visual sensations, each color combination was first scored as to the visibility by Thurstone's paired comparisons technique. Secondly, the visual sensation was deduced by applying Weber-Fechner's law to the luminance of the foreground colors. As results, the luminance of a foreground color influenced the visibility; however the visibility rating is difficult only using the luminance of web-safe colors. These indicate that the chromaticity and chroma saturation are necessary in rating of chromatic web-safe color visibility.

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