环境光照对显示器呈色的影响研究(2):环境光对显示色域的影响

Investigation of the Impact of Surrounding Light on Monitor's Color Showing, Part Ⅱ: Impact on Color Gamut

光照环境中,显示器呈现的颜色由其自身发光和屏幕表面对环境光照的反射光共同决定。利用显示器实际呈色的颜色关系,实验对两个显示器分别在不同环境光照下颜色呈现的色域和单色阶调曲线的变化特性进行了分析。结果表明,随着环境光照强度的增加,显示器的呈色突出表现为黑场和暗调颜色区域的明度逐渐增加,造成该区域的色域压缩,但白场明度增加较小。各颜色的阶调曲线也表现为在中低明度处的层次压缩。这种色域和阶调层次在暗色调的压缩程度不仅与环境光照强度有关,而且还与屏幕本身的黑场光亮度和屏幕表面对环境光照的反射程度有关。

Under surrounding light, the color showing on monitor＇s surface is produced by its emitting light and the reflected light of surrounding light by the surface. Utilizing the color characterizing relation of monitor, the actual color showing performances of two monitors in color gamut and tone curves under different conditions of surrounding light are investigated. The experiment results show that the luminance values of some dark colors and black point increase with the lightness increase of surrounding light, resulting in the compress in gamut within the color space area. And the same phenomena appears in every color tone curves. But the change in luminance value of the white point is much smaller relatively. And the results reveal simultaneously that the compress extent not only correlate directly with the lightness ofsurrounding light, but also with the relative increase in black point lightness, further, with the intrinsic emitting light and reflecting capability of the monitor＇s surface.