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彩色数字设备颜色特性化是图像复制色彩管理流程中颜色转换的基础。为了让普通用户也可以实现照相机特性化,在研究白天自然光和夜晚日光灯2种办公照明环境下使用仪器特性化的基础上,提出一种自然光办公照明环境下不使用专业仪器的特性化方案,该方案只需要用户拥有一张ColorChecker 24色色卡。对特性化精度实验研究结果表明:在普通办公室环境下采用专业仪器测量,日光灯和自然光照明环境下的特性化精度平均在3.5～3.9个CMC(1:1)色差单位;在自然光照明环境下,不使用仪器测量的特性化精度是3.75个CMC(1:1)色差单位,与使用仪器测量的3.48个CMC(1:1)色差单位相比增加非常小;晴朗白天12:00～15:00,自然光照度变化和色温变化条件下,不使用仪器测量的特性化精度变化在0.5个CMC(1:1)色差单位,说明了该方案具有实用性。
The color characterization of color digital devices is the basis of color conversion in the process of image reproduction color management. In order to enable ordinary users to realize the camera characterization, this paper proposes a characterization scheme that does not use professional instruments in the office lighting environment of natural light based on the study of the characteristics of the instrument used in two kinds of office lighting environment, natural daylight and night fluorescent lamp. The solution only requires the user to have a ColorChecker 24 color swatch. The experimental results on the characterization precision show that the average accuracy of the characterization under the environment of fluorescent lamps and natural light illumination is 3.5 ~ 3.9 CMC (1: 1) color difference units in the measurement of the general office environment. In the natural light illumination environment, Characterization without instrumentation is 3.75 CMC (1: 1) color difference units and increases very little compared to 3.48 CMC (1: 1) color difference units measured with the instrument; sunny daytime, 12: 00-15: 00 , The change of the natural illumination and the change of the color temperature, the characteristic accuracy of the measurement without the instrument changed by 0.5 CMC (1: 1) color difference unit, which shows the practicality of the scheme.