Thermochromism Effecton Chromaticity Coordinate Valueand Color Difference in Accurate Color Measurement

摘要

When we discuss the meaning of chromaticity coordinates and color differences, we always want to avoid or diminish the effects from photology, physics, chemistry, physiology and psychology and we want to match the measurements with human color vision. Then we may discuss the unhomogeneity of the CIELAB color space or other color spaces in theory. This paper discusses that the thermochromism effects on the chromaticity coordinates and color differences in thermo effect. The changes for chromaticity coordinates with temperature variation were discussed in this paper. The aim of this paper is to discuss the effect on chromaticity coordinates and color differences for thermochromism in precise color measurement. We found that the longer wavelength, especially the yellow color and the red color, is more sensitive to the temperatue variation and for a individual color , lightness is more sensitive than chromaticity. So the temperature may cause greater effect on chromaticity coordinates and color differences. But the achromatism, such as gray, white, black, is less sensitive to temperature variation.