英文摘要
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The purpose of this study is to investigate different brightness contrasts of character-background, character sizes, and surface-coating types upon the legibility of Chinese characters on health-food packages for elderly people. Forty elderly people participated in the experiment. This study grouped the health-food packages into four surface-coating types: Matte PP Coating, Varnish Coating, Poly Propylene Coating, and Ultra Violet Coating. The character sizes vary from 9Q, 10Q, and 11Q for the package print. The brightness contrasts of character-background are set to low, medium, or high levels. The Chinese characters were of the round style in black with the same stroke number of nine in this study. The experimental illumination was controlled at 500-1000 lx. Each subject read samples of health-food packages with various brightness contrasts, character sizes under a single surface-coating type. The number of misread characters and the subjective estimation were recorded during the experiment.
The results of this study indicate that, the bigger the brightness contrast of character-background, and the larger the character size, the fewer the number of misread characters and the higher the subjective estimation. Furthermore, there were more significant interactions between the brightness contrast of character-background and the character size of the misreading characters for high gloss surface-coating types (such as Poly Propylene Coating and Ultra Violet Coating), than for low gloss surface-coating types (such as Matte PP Coating and Varnish Coating). Thus, for elderly people, in order to decrease the average number of misreading characters and to increase the subjective estimation, it is suggested that characters of at least size 10Q be used on Varnish Coating type surface with low gloss, and that characters of at least size 11Q be used on Ultra Violet Coating type surface with the high gloss, for Chinese characters in the round style.
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