Journal of the Ergonomics Society of Korea (대한인간공학회지)

Ergonomics Society of Korea (대한인간공학회)
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Subjective Assessments and Analyses of Letter Sizes Under Black and White Contrasts for Various Font Sizes Through the Irradiation-effect

광삼효과를 이용한 흑백 대비에서의 여러 글자크기에 대한 주관적 평가와 분석

  • Kong, Yong-Ku (Department of Industrial Engineering, Sungkyunkwan University) ;
  • Kim, Dae-Min (Department of Industrial Engineering, Sungkyunkwan University) ;
  • Sohn, Seong-Tae (Department of Industrial Engineering, Sungkyunkwan University) ;
  • Han, Jun-Goo (Department of Industrial Engineering, Sungkyunkwan University)
  • 공용구 (성균관대학교 산업공학과) ;
  • 김대민 (성균관대학교 산업공학과) ;
  • 손성태 (성균관대학교 산업공학과) ;
  • 한준구 (성균관대학교 산업공학과)
  • Received : 2010.02.12
  • Accepted : 2010.02.25
  • Published : 2010.02.28
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Abstract

Irradiation is a phenomenon that causes white objects on a black background to appear to spread into near dark backgrounds, but the reverse is not. In this study, the effects of font size and thickness of letters on the legibility were investigated in combinations of black letters/white background as well as white letters/black background. Ten subjects who had been no disease of eyes and their eyesight is over 1.0 were recruited and tested subjective assessments of letter sizes for various font sizes (2pt to 80pt) and thickness of letters (normal, bold) under 600lux illumination and 50cm-distance of eyes and target letters for this study. Ming-style font type which was generally used in text of books, papers, and journals were tested in this study. Results showed that generally people subjectively assessed the white letters on black background (W/B) were larger sizes of letters than the black letters on white background (B/W) even both letter sizes were the same in both normal and bold thickness of letters. This phenomenon was happened in case of only over 22 font size (with border line about 22~24pts). Less than 22 font sizes, many people reported that both letters (W/B and B/W) are looks the same sizes in normal as well as bold letters. These findings were interpreted also by the irradiation phenomenon and more detail information was presented in this manuscript.

Keywords

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