The purpose of this study was to measure each color of three sections of wood with instruments, and to examine whether there were differences between each color of three sections. The total number of tree species measured was 60, with the same number of conifers and broadleaf trees. A test piece, which was a cube with one side of 34 mm, was prepared for each tree species. End grain, edge grain, bark side and pith side of each test piece were flattened by a hand planer. Then, lightness L* and hue/saturation (a*, b*) in the L*a*b* color space were measured with a spectrophotometer. The results showed that the end grain had a lower L* compared to the other planes. The end grain was reddish and yellowish because it had a large a* and small b*. When chroma C* and hue angle h in the L*C*h color space were calculated from a* and b*, the end grain had a small dullness with less vividness because C* was smaller than the other planes. L*, a*, b*, C* and h on the other planes excluding the end grain were almost equal for each plane. Furthermore, it was found that the plane whose lightness L* had the strongest correlation with the density of the test piece was the end grain. Therefore, the correlation diagrams between the density, average of annual ring width, and L*of the end grain of each test piece were shown.

中文翻译：

---

根据木材的三个部分进行颜色测量

这项研究的目的是使用仪器测量木材的三个部分的每种颜色，并检查三个部分的每种颜色之间是否存在差异。所测量的树种总数为60，针叶树和阔叶树的数量相同。为每种树种准备了一块侧面为34毫米的立方体的测试片。用手工刨平整每个试验片的端粒，边缘粒，树皮侧和髓侧。然后，用分光光度计测量亮度L *和L * a * b *颜色空间中的色相/饱和度（a *，b *）。结果表明，与其他平面相比，最终晶粒的L *更低。最终晶粒为红色和淡黄色，因为它的a *大而b *小。当从a *和b *计算出L * C * h颜色空间中的色度C *和色相角h时，由于C *比其他平面小，最终晶粒的钝度小而生动度较低。除端粒之外的其他平面上的L *，a *，b *，C *和h对于每个平面几乎相等。此外，发现，亮度L *与试验片的密度的相关性最强的平面是端粒。因此，示出了每个试验片的密度，年轮宽度的平均值和端粒的L *之间的相关图。