数字影像输出设备色彩性能分析

Analysis of color characteristics of digital imaging output devices

为了充分认识数字影像输出设备的色彩表现能力,对色域的确定和分析方法进行了探讨。采用的方法是,在CIELAB色空间中确定色域边界,并求解色域体积、分体积,以及白点、黑点和6个主色调最大彩度色的色度值,同时给出CIELABL*a*b*三维和CIEXYZ_xy、CIELAB_a*b*二维色域边界图。在3种类型5个设备上进行了应用,得到的指标特性符合其实用特性。实验结果表明,色域体积和分体积能够反映设备输出颜色范围的总体大小和不同色调区域的大小,白点、黑点和主要色调的色度值可反映白色、黑色和饱和色的表现力度,三维、二维色域边界图则直观地显示了不同设备色域的差异。

In order to understand the color representation of digital imaging devices, a method for determining and analyzing device＇s color gamut was discussed. Color gamut boundaries were determined in the CIELAB color space. Gamut volume, segment gamut volumes, and the colorimetric values of white, black and six extreme colors were calculated. Meanwhile figures of 3_D_L ＊ a ＊ b ＊ and 2_D_xy, 2_D_a ＊ b＊ gamut boundaries were showed. Based on the proposed method, the color properties for five devices of three types were obtained, and the resulting index were true of their applied characteristics. The experiment showed that gamut volume and segment gamut volumes could present the color production abilities in all and different hue areas, the colorimetric values of white, black and six extreme colors might show the degrees in producing these colors, and 3_D and 2_D gamut boundary figures might directly display the differences of different gamuts.