Abstract
We tested the image quality of face color for several color reproduction ranges. Image quality was subjectively measured according to a five-grade scale. We prepared test images by using a software program to add white into the image data to decrease the color saturation of the test images. Six different color reproduction ranges, 69%, 50%, 39%, 29%, 19%, and 12% the NTSC color reproduction range, were simulated by changing the amount of white added. Nine portraits were used as the test images. Test participants were asked to judge the quality of the face color and also to judge the amount of perceived unnatural whiteness in the face color.The results show that the quality of facial coloration decreases and that the perceived unnatural whiteness increases as the color reproduction range is reduced. We found that 50% or more color reproduction was necessary to achieve “fair” to “good” quality color and that no unnatural whiteness was perceived when the color quality was better than intermediate between “fair” and “good”. We also found that the saturation of face color was about 80% that of the original image color.
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