A Correlation Study between Two Color-Measuring Spectrophotometers
Final rept. Feb-Sep 1990
ARMY NATICK RESEARCH DEVELOPMENT AND ENGINEERING CENTER MA
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The US Army recently completed a four phase effort to develop an objective computerized method for evaluating shade acceptability of dyed and printed textiles for the government quality assurance program. Rapidly emerging developments in the field of optics and computers have made older instruments obsolete. This study evaluates the repeatability and correlation between two spectrophotometers manufactured 8 years apart by Applied Color Systems of Princeton, New Jersey. The samples 20 fabric swatches, 22 porcelain tiles and a color difference pair were measured for short-and long-term repeatability. Each instrument was found to show a repeatability of 0.12 CIELAB color difference units or less for the two time periods studied. The largest color difference units or less for the two time periods studied. The largest color difference observed between the two instruments for these samples was 0.5 CIELAB color difference units.