ASTM E1347 Color-Difference Measurement by Tristimulus Colorimetry
ASTM E1347 technique involves the use of a tristimulus colorimeter, also known as a tristimulus filter colorimeter or a color-difference meter, to take instrumental measurements of specimens that result in color coordinates and color difference values. The values expressed in SI units are considered as standard.
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- Overview
- Scope, Applications, and Benefits
- Test Process
- Specifications
- Instrumentation
- Results and Deliverables
Overview
ASTM E1347 defines a standardized method for quantifying color differences between specimens using tristimulus colorimetry. The method evaluates color using CIE-based color spaces, enabling objective comparison of visual color variations under controlled illumination and viewing conditions.
It is widely used to ensure color consistency in manufacturing and quality control. By measuring differences numerically, it eliminates subjective visual judgment and allows precise assessment of whether two samples match within acceptable tolerances for industrial and commercial applications.
Scope, Applications, and Benefits
Scope
ASTM E1347 applies to the measurement of color differences using tristimulus values derived from standardized light sources and observer functions. It is suitable for opaque, translucent, and semi-transparent materials.
- Measurement of color difference using tristimulus colorimetry
- Use of CIE color spaces such as Lab* and XYZ
- Applicable to opaque and translucent materials
- Evaluation under standardized illumination conditions
- Comparison between reference and test specimens
Applications
- Color quality control in coatings and paints
- Textile and fabric color matching
- Plastic and polymer color verification
- Printing and packaging consistency
- Automotive interior and exterior color matching
- Consumer product color validation
Benefits
- Provides objective and quantifiable color difference values
- Eliminates subjective visual evaluation errors
- Ensures batch-to-batch color consistency
- Supports strict quality control systems
- Enhances product appearance consistency
- Enables fast and reliable color comparison
Test Process
Sample Preparation
Prepare clean, uniform test and reference specimens.
1Instrument Calibration
Calibrate the colorimeter using certified reference standards.
2Color Measurement
Measure tristimulus values of both samples under defined lighting.
3Color Difference Calculation
Compute ΔE values to quantify color differences.
4Technical Specifications
| Parameter | Details |
|---|---|
| Measurement Principle | Tristimulus colorimetry |
| Light Source | Standard illuminants |
| Observer Angle | Standard 2° or 10° observer |
| Measurement Parameter | Color difference (ΔE) |
| Detector Type | Tristimulus photodetectors |
| Geometry | 45/0 or d/8 depending on instrument |
| Wavelength Range | Visible spectrum (approx. 400–700 nm) |
Instrumentation Used for Testing
- Tristimulus colorimeter
- Spectrophotometer (optional for advanced analysis)
- Standard calibration tiles (white and black)
- Standard light source with defined illuminants
- Sample positioning fixture
- Color analysis software
Results and Deliverables
- Tristimulus values (X, Y, Z or L*, a*, b*)
- Color difference (ΔE) values
- Color space coordinates
- Pass/fail assessment against tolerance limits
- Calibration and measurement report
- Quality control documentation
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Frequently Asked Questions
ASTM E1347 is based on tristimulus colorimetry, which quantifies color using three values corresponding to human vision sensitivity. It measures color differences numerically, enabling objective comparison between a reference and a test sample under standardized illumination conditions.
Tristimulus colorimetry uses standardized observer functions and illuminants to replicate human visual perception mathematically. This reduces subjectivity, ensuring consistent and repeatable color measurements across different instruments, operators, and testing environments.
ΔE represents the numerical difference between two colors in a defined color space. It indicates whether the difference is perceptible to the human eye, helping manufacturers decide if a product meets color acceptance criteria or requires adjustment.
ΔE can be influenced by surface texture, lighting conditions, instrument calibration, and sample uniformity. Even small variations in measurement geometry or observer settings can affect the calculated color difference, requiring strict control of testing parameters.
Tristimulus data simplifies color representation into three values aligned with human vision, making it easier to compare and interpret color differences quickly while still maintaining accuracy.
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