Influence of Lightness Contrast on KANSEI Evaluation of Photographic Images

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  • 撮影画像の明度コントラストが感性的評価に及ぼす影響

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The purpose of this study is to clarify the effects of the lightness of main objects (Lt), background (Lb), and the lightness contrasts (|Lt-Lb|/Lav), upon observers' KANSEI impression, and further to investigate their relation to the screen size. In this experiment, 17 pictures with different lightness contrasts were taken by the digital camera. 68 test images are prepared by converting each of the original pictures to four different sizes. A test image was presented on a display to the observer, and he/she was instructed to evaluate the impression of the image using an index with seven ranks ranging from 0 to 6 for 22 assessment words. Results showed that subjective rating value for psychophysical properties of image increases monotonously with the increase or decrease of the lightness contrast, respectively. On the other hand, the rating value for KANSEI impression of image showed a peak at moderate contrast. Effect of image size was significant for the larger the image size. Results of multiple classification analysis on all subjective rating values indicated that “KANSEI factor” is strongly related to the lightness of main object and the image size.

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