title: [Research on developping the spectral dataset for Dunhuang typical colors based on color constancy].
abstract: The present paper aims at developping a method to reasonably set up the typical spectral color dataset for different kinds of Chinese cultural heritage in color rendering process. The world famous wall paintings dating from more than 1700 years ago in Dunhuang Mogao Grottoes was taken as typical case in this research. In order to maintain the color constancy during the color rendering workflow of Dunhuang culture relics, a chromatic adaptation based method for developping the spectral dataset of typical colors for those wall paintings was proposed from the view point of human vision perception ability. Under the help and guidance of researchers in the art-research institution and protection-research institution of Dunhuang Academy and according to the existing research achievement of Dunhuang Research in the past years, 48 typical known Dunhuang pigments were chosen and 240 representative color samples were made with reflective spectral ranging from 360 to 750 nm was acquired by a spectrometer. In order to find the typical colors of the above mentioned color samples, the original dataset was devided into several subgroups by clustering analysis. The grouping number, together with the most typical samples for each subgroup which made up the firstly built typical color dataset, was determined by wilcoxon signed rank test according to the color inconstancy index comprehensively calculated under 6 typical illuminating conditions. Considering the completeness of gamut of Dunhuang wall paintings, 8 complementary colors was determined and finally the typical spectral color dataset was built up which contains 100 representative spectral colors. The analytical calculating results show that the median color inconstancy index of the built dataset in 99% confidence level by wilcoxon signed rank test was 3.28 and the 100 colors are distributing in the whole gamut uniformly, which ensures that this dataset can provide reasonable reference for choosing the color with highest color constancy during the color rendering process of Dunhuang cultural heritage.
authors.affiliation: School of Printing and Packaging, Wuhan University, Wuhan 430079, China. liuqiang@whu.edu.cn
authors.forename: Qiang
authors.initials: Q
authors.lastname: Liu
authors.affiliation: School of Printing and Packaging, Wuhan University, Wuhan 430079, China.
authors.forename: Xiao-Xia
authors.initials: XX
authors.lastname: Wan
authors.affiliation: School of Printing and Packaging, Wuhan University, Wuhan 430079, China.
authors.forename: Zhen
authors.initials: Z
authors.lastname: Liu
authors.affiliation: School of Printing and Packaging, Wuhan University, Wuhan 430079, China.
authors.forename: Chan
authors.initials: C
authors.lastname: Li
authors.affiliation: School of Printing and Packaging, Wuhan University, Wuhan 430079, China.
authors.forename: Jin-Xing
authors.initials: JX
authors.lastname: Liang