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CIECAM02色貌模型表征翡翠绿色可行性研究报告DOC

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本报告通过使用 CIECAM02 色貌模型对绿色翡翠样品色貌属性参数的计算 研究色貌模型预测变换观察条件产生的翡翠绿色色貌变化的现象的可行性及 CIECAM02 色貌模型用于表征翡翠绿色的优势。 使用 Color i5 测色仪测量绿色翡翠样品的三刺激值 XYZ 及 CIE1976L * a * b * 均 匀色空间色度参数 L、a、b。通过计算机 C 语言编写 CIECAM02 色貌模型计算 程序计算绿色翡翠样品的色貌属性参数。结果表明 CIECAM02 色貌模型可以预 测变换周边环境(平均、昏暗、很暗)、变换标准照明光源(D 65 、D 50 、A)及标 准照明光源照度变化的不同观察条件下绿色翡翠样品的色貌属性。环境条件改变 对绿色翡翠样品色貌的影响程度大于光源照度水平变化对翡翠样品色貌的影响, 影响主要体现在视明度及视彩度,对色相的影响很小。 CIECAM02 色貌模型可以预测复杂的色貌现象。1、环境逐渐变暗的过程中 绿色翡翠样品的明度值、彩度值和饱和度值升高色相角增大,预测了人眼在观察 颜色时的自动颜色平衡现象;2、分别用标准光源 D 65 、D 50 及 A 光源照射绿色 翡翠样品的过程中,绿色翡翠样品色调角的预测显示色调角向蓝区偏移。 表明 CIECAM02 色貌模型可以预测 Helson-Judd 效应;3、视彩度随照度的 增加而增高。表明 CIECAM02 色貌模型可以预测 Hunt 效应;4、视明度随 照度的增加而增高。表明 CIECAM02 色貌模型可以预测 Stevens 效应。 CIECAM02 色貌模型可以预测不同条件下绿色翡翠样品色貌, CIE1976L * a * b * 均匀色空间仅可以预测特定观察条件下的色貌。同种条件下, CIECAM02 色貌模型与 CIE1976L * a * b * 均匀色空间预测明度效果相当, CIECAMA02 色貌模型对绿色翡翠样品色相及彩度的预测结果高于 CIE1976L * a * b * 均匀色空间的预测值。因此,CIECAM02 色貌模型与 CIE1976L * a * b * 均匀色空间相比更适合预测不同环境条件及不同光源及不同照度水平下高彩度 的绿色翡翠的色貌。 关键字:CIECAM02 色貌模型,环境条件,照度,绿色翡翠色貌Abstract This paper, by using CIECAM02 color appearance model, is to study the feasibility of forecasting green jade color appearance parameters while transforming observation conditions and the advantages of characterizing the green jade color by CIECAM02. Use Color i5 color measurement instrument measuring green jade XYZ values and CIE1976L * a * b * chromaticity parameters L,a, b. Through the computer C language program the CIECAM02 color model to calculate the green jade color appearance parameters. Results show that the CIECAM02 color appearance model can predict green jade color appearance parameters while changing observing conditions such us environment (Average, Dim, Dark), standard light (D 65 ,D 50 , A)and the intensity of illumination.The influence of Environmental conditions was greater than the intensity of illumination,especially on Lightness and Colorfulness instead of Hue. CIECAM02 color appearance model can predict complex color appearance phenomena, such as the visual color balance, the Helson-Judd effect, the hunt effect and the Stevens effect. CIECAM02 color appearance model can predict green jade color under different conditions while CIE1976L * a * b * uniform color space only the specific condition. On the same condition,CIECAM02 color appearance model and CIE1976L * a * b * uniform color space are comparative and the valueof Hue and Chroma are higher than the CIE1976L * a * b * .As a result, CIECAM02 color appearance model is more suitable on predicting high chroma green jade color appearance under different environment conditions and different standard light and different illumination levels. Key words: CIECAM02 color appearance model, environment conditions, Luminosity, green jade color appearance目录 1、 引言..................................................................................................................1 1.1 宝玉石颜色评价研究现状.....................................................................1 1.1.1 翡翠绿色评价体系研究现状....................................................2 1.1.2 色度学体系用于翡翠绿色评价................................................2 1.2 颜色测量方法.........................................................................................3 1.2.1 目视测色(比色法)与颜色的显色系统表示法...................4 1.2.2 仪器测色与颜色的色度参数表示法.......................................6 1.2.3 色貌模型用于表征翡翠绿色的意义.......................................7 1.3 翡翠绿色数据化的研究意义.................................................................8 1.4 报告主要工作及工作量.........................................................................8 2、 色貌现象与色貌模型......................................................................................9 2.1 色貌的基本概念.....................................................................................9 2.1.1 色貌属性....................................................................................9 2.1.2 色貌属性的影响因素................................................................9 2.2 色貌现象...............................................................................................10 2.2.1 观察条件不同产生的色貌现象..............................................10 2.2.2 照明环境不同产生的色貌现象..............................................11 2.3 色貌模型...............................................................................................13 2.3.1 色貌模型研究现状..................................................................13 2.3.2 CIECAM02 色貌模型的结构 .................................................15 3、 绿色翡翠样品颜色测试................................................................................20 3.1 样品选择...............................................................................................20 3.2 测试条件...............................................................................................20 3.2.1 标准光源的选取......................................................................20 3.2.2 背景与环境参数的确定..........................................................20 3.2.3 适应场绝对亮度的确定..........................................................21 3.3 翡翠样品颜色测试...............................................................................244.CIECAM02 正算模型用于计算翡翠绿色色貌属性 ....................................32 4.1 CIECAM02 正算模型用于翡翠绿色样品绿色的表征 ......................33 4.1.1 输入数据与环境参数.............................................................33 4.1.2 模型输出参数.........................................................................34 4.2 需要注意的问题..................................................................................35 4.3 数据分析..............................................................................................35 4.3.1 环境条件变化对目标色色貌的影响.....................................35 小结.........................................................................................................38 4.3.2 照明光源变化对翡翠绿色色貌的影响.................................38 小结.........................................................................................................41 4.3.3 照度变化对翡翠绿色色貌的影响.........................................41 小结.........................................................................................................43 5.CIECAM02 与 CIE1976L * a * b * 表征翡翠绿色结果对比 ..............................45 5.1 CIE1976L * a * b * 色空间与 CIECAM02 色貌模型绿色翡翠样品明度预 测结果比较研究............................................................................................46 5.2 CIE1976L * a * b * 色空间与 CIECAM02 色貌模型绿色翡翠样品彩度预 测结果比较研究............................................................................................47 5.3 CIE1976L * a * b * 色空间与 CIECAM02 色貌模型绿色翡翠样品色相预 测结果比较研究............................................................................................49 小结................................................................................................................50 6.主要结论.........................................................................................................51 致谢.......................................................................................................................56