VITA 3D-Master比色片数码颜色在Lab颜色空间的分布

目的 获得VITA 3D-Master比色板各色片的数码颜色在Lab颜色空间的色度分布情况。方法 用Nikon D700单镜头反光数码相机在D50标准光源下，对VITA 3D-Master比色板进行拍摄，用Photoshop软件直方图读取每个比色片中1/3区域的R、G和B平均值，根据该值建立新的均匀颜色图像文件作为该比色片的平均颜色，在Eye-One Photo SG软件中建立相同颜色色块的文件，读取Lab数值，进行比较和分析。结果 VITA 3D-Master比色板的26个色片在三维Lab颜色空间中的色度分布，明度轴上呈5个层面分布；在2、3、4层面内，6个色片围绕中间色片呈非等距不规则分布。结论 对VITA 3D-Master比色片的数码颜色在Lab颜色空间分布的分析，有助于提高临床工作中牙齿颜色的选择、交流和复制的准确性。

Digital color distribution of VITA 3D-Master shade guide in Lab color space

Objective To obtain the chromaticity distribution of the digital color of the VITA 3D-Master shade guide in the Lab color space. Methods The photos of a VITA 3D-Master shade guide were shot under the D50 standard light source with Nikon D700 single-lens reflex digital camera. A new uniform color image file was established according to the average value of R, G and B of the middle third area of each tab read with histogram in Photoshop software. The same uniform color file was created and the Lab values were read and analyzed in the Eye-One Photo SG software. Results The chromaticity distribution of the 26 tabs of the VITA 3D-Master shade guide in the three-dimensional Lab color space showed five levels of distribution on the brightness axis. In the 2, 3 and 4 level, the color of tabs was distributed irregularly and at different distances. Conclusion The study of digital color distribution of VITA 3D-Master shade guide in Lab color space can improve the selection, communication and replication of tooth color successfully in clinic.