摘要
本文对木材材色的定量表征方法作了简要的评述,并就红种国产针、阔叶树材按CIE(1931)和CIE(1976)(L~*a~*b~*)做了详细的测定和分析。测定结果表明,表色参数(主波长、色纯度、亮度等)要具有可比性,所用的方法和测定条件必须相同。树种之间的色度坐标值的差异大于树种之内的差异。分析木材表面的反射率曲线,不同树种间的材色差异既反映在亮度上,也反映在色调上;但同一树种内的差异主要反映在亮度上。另外,树种之间与树种之内木材表面反射率与波长关系的曲线形状相似,趋向也一致,说明尽管材色的变异性很大,但有一定的规律性。因此采用了主成分分析法,简化表色空间,获得了综合材色参数的实验式;初步测试,实验式具有一定的可靠性与实用意义。为了能直观地表达材色,除了使用综合材色参数外,还给出了孟塞尔标号。
Methods of quantitative characterization of wood color were briefly reviewed. 22 Chinese common wood species including both softwoods and hardwoods were selected for wood color measurements according to CIE (1931) and CIE (1976) (L~*a~*b~*) systems. Results revealed that color parameters of different woods or samples were not very much comparable unless the method of measurement employed and the measuring conditions were exactly the same. The difference of wood chromaticity co-ordinates among species were greater than within species. Although wood color differences among species exhibited both in luminosity and chromati city to a certain extent but within species significant variation mainly exhibited in luminosity.
The shapes and tendencies of those curves for reflectance of wood surfaces against wave-lengthes were found very similar both among and within species. In general, the wood color of those species tested exhibited some significant variations but they had certain regularities. So it seemed possible to simplify the color spaces by means of the principal component analysis, a method in mathmatical statistics. Comprehensive parameters were obtained and two empirical formulas were thus established. Preliminary tests for these formulas proved quite reliable. For the convenience of directly perceiving the wood color, Munsell color notations were also given in addition to the CIE parameters.
出处
《林业科学》
EI
CAS
CSCD
北大核心
1990年第4期344-352,共9页
Scientia Silvae Sinicae
关键词
木材
材色
定量表征
表色参数
Wood colour
CIE (1931)
CIE (1976) (L~*a~*b~*)
Munsell colour notation
Dominant wave-length
Colour purity
Luminosity
