This paper describes an investigation on the legibility of color texts. We concentrate on line reproduction quality and modulation transfer function (MTF) of Y data in CIE XYZ color space of original images, and study the correlation between legibility and each of these two characteristics in order to develop an objective evaluation method. We begin by preparing samples of test targets of various colors. Then the line reproduction quality and MTF are measured and the legibility is evaluated subjectively for comparison. As a result, we have found that we can predict the legibility of color texts even on color background by the use of these two characteristics.
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