MaTestLab > Test Standards > ASTM E308 Standard Practice for Computing the Colors of Objects by Using the CIE System
Last updated 1st May 2024
ASTM E308 Standard Practice for Computing the Colors of Objects by Using the CIE System
The ASTM E308 standard describes a test that uses the CIE system to calculate object colors. It covers how to choose illuminants, figure out measuring time intervals, and adjust spectral data for bandpass dependency. Standard spectral power values for illuminants are given, along with methods for varying measurement intervals and restricted wavelength ranges. Assuming a triangular spectral bandpass form, the manual also discusses how to adjust spectral data for bandpass dependency. It also contains formulas for computing color differences and processes for translating findings to color spaces, like CIELAB and CIELUV.
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Introduction to ASTM E308
The CIE system is used to calculate object colors according to ASTM E308 Standard Practice. Illuminant spectral power distributions and color-matching functions have been specified by the CIE since 1931, and tristimulus weighting factors have been gathered in many literature sources. By standardizing tristimulus computing techniques, the standard seeks to lessen data discrepancies brought on by various wavelength choices and truncation techniques. Conventions were proposed by Foster et al. in 1970, and Stearns’ extensive tables came next. MaTestLab is one of the best testing service providers, with the best network of testing laboratories in the USA to carry out ASTM E308 tests for our clients. Procedures for situations when spectral data is scarce or where measurement intervals are larger than advised and bandpass correction for instruments with presumed triangular spectral bandpass forms are also covered in ASTM E308.
ASTM E308 Test Method
Apparatus Setup
Spectrophotometer, light source (CIE standard illuminants), observer selection (CIE standard observers), and spectral data measurement instrument.
Test Procedure
The CIE standard illuminant and observer are selected, and the measurement intervals (1, 5, 110, or 20 nm) are chosen. Spectral data correction for bandpass dependence is ensured. For calculations, tristimulus weighting factors are used. Tristimulus values are calculated by summing the products of weighting factors and spectral data. The results are converted to CIE color spaces like CIELAB and CIELUV.
ASTM E308 Test Specimens
Specimen Details
Object color, composition, and surface characteristics are chosen as per the guidelines.
Specimen Preparation
The specimens are cleaned, polished, and adjusted according to the conditions mentioned in the test.
Specimen Dimensions
The dimensions are set by the ASTM specification.
ASTM E308 Test Results
ASTM E308’s importance stems from its ability to provide numerical parameters for color stimuli, which are helpful for production control, research, color specification, and tolerance setting. The test is helpful for several sectors, including textiles, paints, plastics, and printing, since it matches color stimuli, detects color discrepancies, and converts stimulus values into uniform color scales like CIELAB and CIELUV.
Tests Related to ASTM E308
ASTM E308 is a test just like ASTM E144, which is an ASTM specification that helps to provide safe operation for oxygen combustion levels to identify sulfur and carbon from various ores, and ASTM E269, which uses X-ray fluorescence spectroscopy to analyze thorium and uranium in soil.
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FAQ's
Where can I get the astm e308 tested?
You can share your astm e308 testing requirements with MaTestLab. MaTestLab has a vast network of material testing laboratories, spread across the USA and Canada. We support your all material testing needs ranging from specific astm e308 test to various testing techniques.
How much do I need to pay for the astm e308 test?
Please contact us for a detailed quote for your astm e308 testing needs. Cost incurred to carry out different astm e308 testing methodology depends on the type of raw material; number of samples, coupons, or specimens; test conditions, turn around time etc. Costs of some ASTM testing methods start from $100 and the final value depends upon the factors listed above. Please contact us for the best and latest prices.
How many samples are required for astm e308?
The required number of samples or specimens should comply with the procedure given in the astm e308 standard. However, the MaTestLab operations team can assist you for your special requirements once you share your testing details with us.
How much discount can I get on the astm e308 test?
MaTestLab has a vast testing laboratory network, hence we bring you the best testing facilities in a cost-effective way. We offer considerable discounts (15-20%) to our returning customers based on test volume and frequency.
How many days will it take to complete the astm e308 test?
The turnaround time for astm e308 test methodology depends upon the test procedure mentioned in the standard test document. However, we at MaTestLab understand your research requirements and hence try to get your test completed within the least possible time.
Where can I get the astm e308 tested?
You can share your astm e308 testing requirements with MaTestLab. MaTestLab has a vast network of material testing laboratories, spread across the USA and Canada. We support your all material testing needs ranging from specific astm e308 test to various testing techniques.
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