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Proceedings Paper

Harmonization of scales of color measurement
Author(s): Peter J. Clarke; Andrew R. Hanson
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Paper Abstract

Surface color measurements are important in a large range of industries (e.g. printing, textiles, paints and foodstuffs), and a reduction in associated uncertainties is needed to improve competitiveness in the trading of colored goods. One of the major uncertainties is due to the different between measurement scales of national laboratories. A harmonisation process co-ordinated by teh National Physical Laboratory (NPL) was set up to reduce errors in color measurements with a target such that 95% of the results should agree to within 0.5 CIELAB color difference units (ΔE*ab). Nine laboratories took part in the harmonisation process. A wide range of instrumentation was used ranging from commerically available instruments to specially developed facilities. Three of the laboratories also looked at fluorescent color measurement using the two-monochromator technique. The co-ordinator had developed techniques for determining and correcting errors in color measurements as well as a range of transfer standards for color as part of a national research program. Although not all the possible errors for the measurement of color have b ene addressed 93% of the measurements agreed to within 0.5 ΔE*ab

Paper Details

Date Published: 6 June 2002
PDF: 4 pages
Proc. SPIE 4421, 9th Congress of the International Colour Association, (6 June 2002); doi: 10.1117/12.464699
Show Author Affiliations
Peter J. Clarke, National Physical Lab (United Kingdom)
Andrew R. Hanson, National Physical Lab. (United Kingdom)


Published in SPIE Proceedings Vol. 4421:
9th Congress of the International Colour Association

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