Abstract
Lauren Scharff lauren.scharff@usafa.edu Albert Ahumada al.ahumada@nasa.gov) U. S. Air Force Academy Introduction Scharff and Ahumada (2002, 2003abc) measured text legibility for light text and dark text. For paragraph scanning and letter identification, performance was better for dark text than light text when we equate Weber contrast (the difference between text and background luminance divided by the background luminance). In recent studies with better stimulus control (Scharff & Ahumada, 2005; 2008), we continued to find a small, but consistent benefit of dark text for letter identification. Reading involves both scanning and identification. In the experiments below we replicate our scanning result with our improved apparatus and add scanning to our letter identification task by manipulating eccentricity.
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