Legibility of condensed perceptually-tuned grayscale fonts
We analyze the quality of condensed text on LCD displays, generated with unhinted and hinted bilevel characters, with traditional anti-aliased and with perceptually-tuned grayscale characters. Hinted bi-level characters and perceptually-tuned grayscale characters improve the quality of displayed small size characters (8pt, 6pt) up to a line condensation factor of 80%. At higher condensation factors, the text becomes partly illegible. In such situations, traditional anti-aliased grayscale character seems to be the most robust variant. We explore the utility of perceptually-tuned grayscale fonts for improving the legibility of condensed text. A small advantage was found for text searching, compared to bilevel fonts. This advantage is consistent with human vision models applied to reading.
Unable to display preview. Download preview PDF.
- 2.R. D. Hersch, “Font Rasterization, the State of the Art”, Visual and Technical Aspects of Type, (R.D. Hersch, Ed.), Cambridge University Press, 1993, 78–109.Google Scholar
- 6.A. Black, A. Boag, “Choosing Binary or Greyscale Bitmaps: some Consequences for Users”, C. Vanoirbeek & G. Coray (Eds.) Proceedings Electronic Publishing, Cambridge University Press, 1992, 247–260.Google Scholar
- 7.K. O'Regan, N. Bismuth, R. D. Hersch, A. Pappas, “Legibility of Perceptually-Tuned Grayscale Fonts”, Proc. IEEE Int. Conf. Image Processing, (Ed. P. Delogne), Vol 1, 1996, 537–540.Google Scholar
- 8.D. S. Mitrinovic, Elementary Inequalities, Noordhoff, Groningen, 1964.Google Scholar
- 9.R. P. Garzia, ed. Vision and Reading, Mosby-Year Book, 1996.Google Scholar
- 11.F. Vitu, K. O'Regan, A. W. Inhoff and R. Topolski, “Mindless reading: eye-movement characteristics are similar in scanning letter strings and reading texts”, Percept. Psychophys., 57(3), Apr. 1995, 352–36.Google Scholar