Journal of Textile Research ›› 2023, Vol. 44 ›› Issue (10): 104-112.doi: 10.13475/j.fzxb.20220905601

• Dyeing and Finishing & Chemicals • Previous Articles     Next Articles

Cross-media reproduction of Qianlong palette color based on characterization model

SU Miao1,2(), LI Saiquan1,2,3, YANG Limei1,2, DUAN Yiting4, LU Jialiang1,2, ZHOU Kaili1,2   

  1. 1. College of Textile Science and Engineering(International Institute of Silk), Zhejiang Sci-Tech University, Hangzhou, Zhejiang 310018, China
    2. International Center for Silk and Silk Road Studies, Hangzhou, Zhejiang 310018, China
    3. Zhejiang Sci-Tech University Shengzhou Innovation Research Institute, Shaoxing, Zhejiang 311800, China
    4. School of Design, University of Leeds, Leeds LS2 9JT, UK
  • Received:2022-09-21 Revised:2023-07-06 Online:2023-10-15 Published:2023-12-07

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Abstract:

Objective Digital museums break through the barriers of space and time, expanding the range of collections in the form of video and images. However, in the process of museum relic image collection or online display, image reproduction across equipment is prone to color distortion phenomena such as eclipse, color deviation, affecting the visual effect of the image due to the correlation characteristics of color equipment and the lack of standard image collection conditions. In order to solve this problem, the Qianlong palette silk fabric was taken as the research objective to carry out the cross-device color reproduction of textile relic images, aiming to provide support for the establishment of digital museum.

Method On the basis of Qianlong palette silk fabric, the color characterization of digital camera and display screen were carried out respectively. The influences of different image formats, different training data sets and different order of polynomial on the accuracy of camera prediction model were discussed. At the same time, the Gain-Offset-Gamma(GOG) model was used to characterize the chrominance of display screen. Then color difference analysis was carried out to determine the optimal characteristic model of Qianlong chromatography reappearance across equipment. Finally, textile relics collected in the Silk Museum of China were used to test the model.

Results In this study, color information and image information were collected from 210 colors of Qianlong palette. The absence of Qianlong palette in blues (B) and blue-green tones (BG) may be due to the fact that indigo was the only natural blue dye selected in this study, and a stronger dye bath may have biased indigo stained samples towards purple tones (Fig. 6). The L* values of all 210 colors ranges from 17.85 to 78.13(Fig. 7), 210 colors are distributed in four quadrants of the a*-b* plane of CIELAB color space, and is widely distributed in the first quadrant (Fig. 8). The Qianlong palette covers different color series. Among all the colors, red and yellow are the main color series, which are the most important color representations of the royal costume in the Qing Dynasty. The color reproduction accuracy for the silk fabrics has been significantly influenced by the training datasets and the mathematical mapping methods and image format. Using both color charts, the RAW image format shows the better predictive accuracy, followed by the JPG format (Tab. 6), and the 3rd polynomial regression shows the best predictive accuracy (3.20 (ΔEab*)), followed by the 2nd (3.86 (ΔEab*)) and the 1st order polynomial regression (4.15 (ΔEab*)). Finally, the RAW image and third-order polynomial were selected to characterize the chrominance of the camera, and the collected textile color data set was used to train the model. The accuracy of the model can reach 2.18(ΔEab*), this is the highest precision camera characterization model in this study. The accuracy of display characterization model is 0.58 (ΔEab*). The mean color difference value of Qianlong palette and silk relics is 2.16 (ΔEab*), and 2.38 (ΔEab*), indicating that this characteristic model has excellent cross-equipment color reproduction effect.

Conclusion The Qianlong palette is mainly distributed in the yellow tones of the Munsell color system, with less color in the green and purple tones, and no distribution in the blues and blue-green tones. In the color space of L*a*b*, the brightness value of Qianlong chromatographic ranges from 17.85 to 78.13. The brightness value of yellow tone is above medium, and the brightness value of other tones is below medium. For museum image acquisition, it is suggested to standardize the lighting source, which mainly includes the selection of standard lighting body and corresponding color temperature to ensure the uniformity of lighting. At the same time, standardize shooting conditions: select and fix appropriate camera parameter settings, shooting distance, choose remote control shooting to avoid human operation error. For the characteristic prediction model of camera: the textile color data set of the same material and the same specification is used as the training data set, and the image modeling in high order polynomial and RAW format is adopted to obtain higher prediction accuracy and accurately predict the color after textile reduction.

Key words: Qianlong palette, color characterization, silk cultural relic, cross-media, color reproduction

CLC Number: 

  • O432.3

Fig. 1

Schematic diagram of lighting device"

Fig. 2

Trend of brightness of light source over time"

Fig. 3

Relative spectral power distribution curve of illumination light source"

Tab. 1

Main colors of common clothing in Qing dynasty"

服饰 主要颜色
袍 宝蓝、酱色、古铜、驼色、墨色(用得较少)
匹料、装饰 深蓝、宝蓝、部分用黄色系和绿色系
褂 红青色、元青色(少部分)
褡裢裙、套袖 蓝色系和黄色系
彩织、彩绣的绣纰、妆花绒 红色、绿色

Fig. 4

One of 14 Qianlong color charts"

Tab. 2

Camera parameters settings"

参数 设置 参数 设置
色彩空间 sRGB 光圈值 5.6
焦距/mm 50 纵横比 3∶2
对焦方式 AF 分辨率/ppi 6 720×4 480
存储方式 RAW、JPG 拍摄模式 手动档
曝光时间/s 1/80 白平衡/K 6 500
闪光灯 关闭

Tab. 3

Training dataset and testing dataset"

训练数据集 测试数据集
DC标准色卡 DC标准色卡
DC标准色卡 乾隆色卡
乾隆色卡 乾隆色卡

Tab. 4

EIZO display parameters settings"

参数 设置 参数 设置
亮度/(cd·m-2) 120 节能模式 关
色温/K 6 500 模式 标准
伽马 2.2 色彩空间 sRGB

Tab. 5

Display device space uniformity color difference"

颜色 平均色差(Δ E a b *)
白 0.42
灰 0.56
红 0.47
绿 0.66
蓝 0.51

Fig. 5

Three single channel color coordinates"

Fig. 6

Tone distribution diagram"

Fig. 7

Distribution of 210 colors in L*a*b* color space of Qianlong palette"

Fig. 8

Distribution of Qianlong palette with 210 colors in a*- b* diagram"

Tab. 6

Modeling results of different training datasets and prediction datasets"

数据集类型 平均色差(Δ E a b *)
训练数据集 预测数据集 JPG格式 RAW格式
DC色卡 乾隆色卡 3.31 1.30
DC色卡 乾隆色卡 8.83 6.68
乾隆色卡 乾隆色卡 4.20 3.20

Tab. 7

Different Qianlong palette data subset modeling results"

训练数据集 测试数据集 平均色差(Δ E a b *)
乾隆色卡 (210) 乾隆色卡 (210) 3.20
乾隆色卡 (105, 2n-1) 乾隆色卡(105, 2n) 2.18
乾隆色卡 (106~210) 乾隆色卡 (1~105) 43.60

Fig. 9

Mean value of color difference between different hues of Qianlong palette"

Fig. 10

Process map for measure reflectivity of cultural relics. (a)Color measuring; (b) Mark location"

Fig. 11

Comparison of cultural relics before correction (a) and after correction(b)"

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[1] SU Miao, ZHOU Kaili, DUAN Yiting, LU Jialiang, YANG Limei. Color characteristics of Qianlong palette based on chromaticity measurement [J]. Journal of Textile Research, 2023, 44(03): 132-138.
[2] QIU Kebin, CHEN Weiguo, ZHOU Hua, YING Shuangshuang. Research and development of textile color measurement based on imaging technologies [J]. Journal of Textile Research, 2020, 41(09): 155-161.
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