JOURNAL OF THE ILLUMINATING ENGINEERING INSTITUTE OF JAPAN
Online ISSN : 1349-838X
Print ISSN : 0019-2341
ISSN-L : 0019-2341
General Contribution:
Effect of Equivalent Luminance Contrast as One of the Visual Factors for Readability of Chromatic Documents
Yuya KonishiNaoya Hara
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2008 Volume 92 Issue 11 Pages 787-793

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Abstract

Equivalent luminance contrast was investigated as an index that expresses the relationship between color difference and readability of chromatic documents. The relationships between the equivalent luminance contrast and the visual factors were determined. The visual factors are background luminance (which represents adaptation luminance in the visual field with uniform luminance), visual angle of the letters, luminance contrast, and color difference between the letters and the background. For chromatic documents, equivalent luminance contrast was found to be affected by background luminance and the visual angle of the letters. With regard to the various color combinations of background and letters, the relationship between the color difference and equivalent luminance contrast asone of the visual factors was determined. Equivalent luminance contrast was high with a large color difference. Even when there is no color difference, equivalent luminance contrast depended on the direction of the letter color from background color in the CIE1976L*a*b* color space. This directional property was almost the same for all background colors.

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© 2008 The Illuminating Engineering Institute of Japan
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