Study on Colour Characteristics and Quantitative Classification of Nanhong Agate Based on HSB Colour Space

WANG Haotian; HUANG Huimin; YANG Lingyue; YANG Mingxing; HONG Hanlie; WANG Chaowen

doi:10.15964/j.cnki.027jgg.2023.01.001

Volume 25 Issue 1

Jan. 2023

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Article Navigation > Journal of Gems & Gemmology > 2023 > 25(1): 1-13

WANG Haotian, HUANG Huimin, YANG Lingyue, YANG Mingxing, HONG Hanlie, WANG Chaowen. Study on Colour Characteristics and Quantitative Classification of Nanhong Agate Based on HSB Colour Space[J]. Journal of Gems & Gemmology , 2023, 25(1): 1-13. doi: 10.15964/j.cnki.027jgg.2023.01.001

Citation:

WANG Haotian, HUANG Huimin, YANG Lingyue, YANG Mingxing, HONG Hanlie, WANG Chaowen. Study on Colour Characteristics and Quantitative Classification of Nanhong Agate Based on HSB Colour Space[J]. Journal of Gems & Gemmology , 2023, 25(1): 1-13. doi: 10.15964/j.cnki.027jgg.2023.01.001

Citation:

WANG Haotian, HUANG Huimin, YANG Lingyue, YANG Mingxing, HONG Hanlie, WANG Chaowen. Study on Colour Characteristics and Quantitative Classification of Nanhong Agate Based on HSB Colour Space[J]. Journal of Gems & Gemmology , 2023, 25(1): 1-13. doi: 10.15964/j.cnki.027jgg.2023.01.001

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Study on Colour Characteristics and Quantitative Classification of Nanhong Agate Based on HSB Colour Space

doi: 10.15964/j.cnki.027jgg.2023.01.001

WANG Haotian^{1, 2
,},
HUANG Huimin^{1, 2},
YANG Lingyue^{1, 2},
YANG Mingxing^{1, 2},
HONG Hanlie³,
WANG Chaowen^{1, 2
,
,}

1.
Gemmological Institute, China University of Geosciences, Wuhan 430074, China
2.
Hubei Gems and Jewelry Engineering Technology Research Center, Wuhan 430074, China
3.
School of Earth Sciences, China University of Geosciences, Wuhan 430074, China

Received Date: 2022-10-13
Publish Date: 2023-01-31

Abstract

Abstract

In recent years, the price of the Nanhong agate has been rising in jewelry market. As one of the most important factors affecting the quality evaluation of the Nanhong agate, its colour is closely related to the market price. However, the national grading standard of the Nanhong agate has not yet introduced. In order to make the evaluation process of the Nanhong agate colour more objective, scientific and standardized, this paper focuses on the colour characteristics and quantitative classification of the Nanhong agate. The colour images of the samples were obtained by light boxes and cameras. Based on HSB colour space, the colour of the Nanhong agate were standardized and quantified. Origin and SPSS softwares were used to statistically analyze the hue, saturation and brightness (HSB) parameters of the obtained colour data. The results showed that at the 95 % confidence level, the hue (H) of the red Nanhong agate was mainly distributed in a range between[3.20°, 17.52°]. The saturation (S) and brightness (B) were mainly within [63.82%, 92.69%] and [42.97%, 75.37%], respectively. The statistical results were consistent with the visual observed colour characteristics of the Nanhong agate. Combined the characteristics of visual observed colour with the TwoStep cluster analysis, this paper recommends to classify the colour of the red Nanhong agate as follow. The H is divided into three categories, including red (R), orange red (oR), red orange (rO). The S is divided into three levels: S₁, S₂ and S₃. The B is also divided into three levels: B₁, B₂, and B₃. For the saturation (S) in different colour varieties, the "Shizihong""Shuihong" and "Jinhong" (different kinds of red) have greater S than other varieties; the "Binghong" and "Meiguihong" are medium, and the "Bingfen" is the lowest. For brighthess (B), the values of "Bingju" and "Shuihong" are the brightest; the "Shizihong" "Binghong" and "Bingfen" are medium, and the "Jinhong" and "Meiguihong" are the lowest. The colour names of the Nanhong agate in the market are scientifically distinguished and the accurate range of each variety in HSB space is recommended based on the colour distribution characteristics above and the colour grading results.
- Nanhong agate,
- hue,
- saturation,
- brightness,
- colour quantization,
- statistical analysis,
- Baoshan,
- Liangshan

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References(24)

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