GB/T 39648-2020 in English
VALIDTextiles—Tests for colour fastness—Determination of colour fastness grades by digital imaging techniques
- Issued on:2020-12-14
- Implemented on:2021-07-01
- File Format:PDF
- Delivery:Via email within 1~3 business days
$243.00
| Standard No: | GB/T 39648-2020 |
| Document status: | VALID |
| Title in English: | Textiles—Tests for colour fastness—Determination of colour fastness grades by digital imaging techniques |
| Title in Chinese: | 纺织品 色牢度试验 数字图像技术评级 |
| Language: | English |
| File Format: | Electronic (PDF) |
| Delivery: | Via email within 1~3 business days |
| Issued on: | 2020-12-14 |
| Implemented on: | 2021-07-01 |
| ICS Classification: | 59.080.01-Textiles in general |
| Chinese Classification: | W04-Basic standards and general methods |
| Professional Classification: | GB-National Standard |
| Related Keywords: | colour fastness grades
digital imaging system colour fastness determination digital camera d65 digital camera |
| Related Topics: | rating
Color Fastness Rating Color Fastness Rating Primary and secondary chromatograms image technology GBT39648 GB/T 39648-2020 Quote pictures and digital images |
《GB/T 39648-2020纺织品 色牢度试验 数字图像技术评级》由TC209（全国纺织品标准化技术委员会）归口，TC209SC1（全国纺织品标准化技术委员会基础标准分会）执行，主管部门为中国纺织工业联合会。
Introduction
Analysis of the core content of the standard
GB/T 39648-2020 specifies a standardized method for converting color changes into gray card grades using the CIE DE2000 color difference formula using a digital imaging system consisting of a digital camera and a D65 light source box. This standard is modified to adopt ISO 105-A11:2012, and the main technical differences are reflected in:
| Comparison dimensions | ISO standard | GB/T standard |
|---|---|---|
| Reference documents | ISO 105-A01 | Equivalent to GB/T 6151 |
| Instrument requirements | Structure diagram not specified | Figure 1 Instrument structure example is added |
| Calibration materials | Fluorescence requirements not specified | White paper/card is required to be free of fluorescence |
Key technical requirements
1. Hardware system specifications
The digital imaging system must include:
- ≥3 million pixels calibrated digital camera
- D65 light source box (color rendering index> 95)
- Calibration color chart (150+ color blocks)
2. Rating algorithm
Use the improved CIEDE2000 formula to calculate color difference:
Color change rating: GRC=0.88+3.89e-0.2ΔEGRC
Color staining rating: GRS=-0.061ΔEGRS+2.474/(1+e-0.191ΔEGRS)
Implementation and application suggestions
1. Equipment maintenance points
- Replace the D65 light source every 12 months or as required by the manufacturer
- Preheat for 10 minutes before daily use
- Replace the calibration color chart every year and update the spectral data
2. Test precautions
- Multi-color samples need to be rated by different areas
- The most serious part of the non-uniform staining area should be manually selected
- Special treatment conditions must be noted in the test report
Actual application case
After a testing agency adopted this method, the inter-laboratory rating difference dropped from 0.53 to 0.29, which is significantly better than the traditional visual rating (0.61 level difference). Especially when evaluating multi-fiber interlinings, different components can be automatically separated for independent rating.
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