Abstract
The application of digital imaging to color measurement is more and more extensive, which also provides new ideas for gemology. In this paper, the single-factor experiment method and orthogonal experiment design are used to study the influence parameters of the digital imaging system (DIS) on gem color measurement. Among them, the illuminance has the most significant impact on the measurement results, followed by the exposure time, and the change of the measurement distance has an insignificant impact on the results; through range analysis and analysis of variance, the most suitable measurement parameters for red jadeite are 1600 lx, 12,500 μs, 25 cm.
Highlights
The application of digital imaging to color measurement is more and more extensive, which provides new ideas for gemology
In the fields of geoscience, the non-contact color measurement method is widely used to classify and sort ores based on colors and textures[17,18]; Oestreich et al analyzed the composition content of minerals based on digital images[19]; Chatterjee et al used artificial neural networks to effectively predict the attributes of calcium oxide, alumina, and silica in limestone[20]
Wang et al recognized that the D65 standard light source is the most suitable light source for evaluating Jadeite green[29]; Pan et al, Guo, Li believe that D65 light source is suitable to evaluate the red color of jadeite, tourmaline, and ruby respectively[6,30,31]
Summary
The application of digital imaging to color measurement is more and more extensive, which provides new ideas for gemology. Diaz et al analyzed the defects of contact color measurement in obtaining the color of human tissues and organs, and proposed a non-contact color measurement scheme[21]; Yang et al analyzed that computer vision after color correction can be more commonly used[22]; In the study of the color of Dunhuang murals, Wan proposed to use the self-made Dunhuang color charts and Color Checker color chips to make ICC feature files to correct the errors generated between different digital cameras, so that the digital protection and dissemination of Dunhuang murals can receive strong technical support[23]; In our other work, experiments by Zhang et al compared computer vision system and traditional hand-held spectrophotometer for the measurement and evaluation of various colors of jadeite, judged the applicability by experts panel which makes the color matching subjective[24]; in gemology, a digital imaging as one of the non-contact methods can provide researchers with new ideas. The color of jadeite is the most important indicator of value, so it is important to accurately measure and display its color
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