环境光照对显示器呈色的影响研究(1):显示器的特性化

Investigation of the Impact of Surrounding Light on Monitor's Color Showing, Part Ⅰ: Characterization of Monitor's Color Showing

显示器屏幕作为图像和颜色显示器件,得到了广泛应用。建立颜色控制值RGB与对应呈现的颜色色度值间的特性化关系是控制屏幕准确呈色的技术手段和关键,但ICC标准的色彩管理体系中,并没有构建显示器的实际呈色关系。试验基于ICC色彩管理技术,将显示器视为RGB输出设备,并将其实际光色的色度三刺激值CIEXYZ匹配为自身白场下的CIELAB值,建立其与RGB控制值之间的关系,形成显示器自身和环境光照条件下实际呈色的规律。一台普通液晶显示器在3个不同光照环境中的试验结果表明,无论是描述其自身光色,还是不同环境光照下的呈色,色域内RGB到实际呈色预测的ΔE*ab色差平均在1以下,最大也不超过2;期望的呈色与受控下实际呈色的ΔE*ab色差则平均小于1.8,最大小于6。

As an image and color displaying unit, monitor has been used widely. In its color controlling process, the key technique is to establish the relationship between RGB values and their corresponding CIE colorimetric values. But in nowadays ICC color management system, there is no the relation between RGB data and color＇s absolute CIE colorimetric values for monitor. In our study, the CIEXYZ values of a monitor＇s colors are firstly matched to their CIELAB data under its white point, and then a relation between RGB data and CIELAB values is built by using the technique of char-acterizing a RGB output device in ICC system. Experiment is carried out on a popular LCD monitor under three different surrounding lights, and the results shorted that in its gamut volume the forecasting △E^·ab average color difference are all less than 1, and less 2 for maximal color difference, in despite of different light environments. And in case of color forecasting from CIELAB to actual color＇s CIELAB, the results are less 2 and 6 respectively.