Journal
MEASUREMENT
Volume 56, Issue -, Pages 194-202Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.measurement.2014.06.023
Keywords
CIELAB system; CMOS camera; Color calibration; Cultural heritage; Granite; Ornamental stone; RGB values
Funding
- Xunta de Galicia [09TMT014203PR]
- European Union
- Spanish Ministry of Economy and Competitiveness [DPI2008-06455-C02-02, DPI2011-30090-C02-02]
- Barrie de la Maza Foundation
- Galician Plan for Research, Innovation and Growth
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In this study, a digital CMOS camera was calibrated for use as a non-contact colorimeter for measuring the color of granite artworks. The low chroma values of the granite, which yield similar stimulation of the three color channels of the camera, proved to be the most challenging aspect of the task. The appropriate parameters for converting the device-dependent RGB color space into a device-independent color space were established. For this purpose, the color of a large number of Munsell samples (corresponding to the previously defined color gamut of granite) was measured with a digital camera and with a spectrophotometer (reference instrument). The color data were then compared using the CIELAB color formulae. The best correlations between measurements were obtained when the camera works to 10-bits and the spectrophotometric measures in SCI mode. Finally, the calibrated instrument was used successfully to measure the color of six commercial varieties of Spanish granite. (C) 2014 Elsevier Ltd. All rights reserved.
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