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A Color Gamut Assessment Standard: Construction, Characterization, and Inter-Laboratory Measurement Comparison



John M. Libert, Edward F. Kelley, Paul A. Boynton, Steven W. Brown, Christine Wall, Colin Campbell


In earlier papers, NIST proposed a standard illumination source and optical filter targets with which to assess the state-of-the-art of display measurement. The Display Measurement Assessment Transfer Standard (DMATS) was designed to present the display metrologist with a rectangular array of targets such as color filters, polarizers, and grilles, back-lighted by uniform illumination, to be measured using methods and instruments typically used in display performance measurement. A "round robin" interlaboratory measurement exercise using the "standard" artifact suite would enable a first order assessment of display measurement reproducibility, i.e., measurement variability within the electronic display community. The rectangular array design of the DMATS was anticipated to present stray light and color contamination challenges to facilitate identification of error sources deriving from measurement protocols, laboratory environment, and equipment. However, complications in dealing with heating problems threatened to delay the planned laboratory intercomparison. The Gamut Assessment Standard (GAS) was thus designed as an interim solution to enable the NIST scientists and participating measurement laboratories to begin collecting data. The GAS consists of a 150 mm diameter integrating sphere standard illumination source with a stray light elimination tube (SLET) mounted at the exit port. A dual six-position filter wheel is mounted at the SLET exit port. One wheel holds a series of neutral density filters and a second interchangeable wheel holds various color filters. This paper describes the design and construction of the GAS, its initial performance characterization by NIST, and comparison measurements made at NPL. Possible design changes suggested by the results of the preliminary intercomparison are discussed, as are plans for future interlaboratory comparisons and potential use of the GAS as a transfer standard for laboratory self-certification.
Proceedings Title
Proc., Fourth Oxford Conference on Spectrometry
Conference Dates
June 9-13, 2002
Conference Location
Davidson, NC, USA
Conference Title
Fourth Oxford Conference on Spectrometry


display measurement, colorimetry, interference filters


Libert, J. , Kelley, E. , Boynton, P. , Brown, S. , Wall, C. and Campbell, C. (2003), A Color Gamut Assessment Standard: Construction, Characterization, and Inter-Laboratory Measurement Comparison, Proc., Fourth Oxford Conference on Spectrometry, Davidson, NC, USA, [online], (Accessed April 22, 2024)
Created January 31, 2003, Updated October 12, 2021