RT Journal Article
T1 Conversion of a digital camera into a non-contact colorimeter for use in stone cultural heritage: the application case to Spanish granites
A1 Sanmartín Sánchez, Patricia
A1 Chorro Calderón, Elísabet
A1 Vázquez Nión, Daniel
A1 Martínez Verdú, Francisco Miguel
A1 Prieto Lamas, Beatriz
K1 CIELAB system
K1 CMOS camera
K1 Color calibration
K1 Cultural heritage
K1 Granite
K1 Ornamental stone
K1 RGB values
AB 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.
PB Elsevier
SN 0263-2241
YR 2014
FD 2014-10
LK https://hdl.handle.net/10347/46093
UL https://hdl.handle.net/10347/46093
LA eng
NO Sanmartín, P., Chorro, E., Vázquez-Nion, D., Martínez-Verdú, F. M., & Prieto, B. (2014). Conversion of a digital camera into a non-contact colorimeter for use in stone cultural heritage: The application case to spanish granites. Measurement, 56, 194–202. doi:10.1016/j.measurement.2014.06.023
DS Minerva
RD 21 may 2026