A proposal for a method to measure the colour of red wines by measuring transmittance at three wavelengths
- M. C. Juárez 1
- José Federico Echávarri Granado 1
- A. Ignacio Negueruela Suberbiola 2
- 1 Laboratorio de Color de la Rioja, Luis de Ulloa 20, 26004 Logroño, Spain
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2
Universidad de Zaragoza
info
ISSN: 1082-0132, 1532-1738
Year of publication: 1997
Volume: 3
Issue: 3
Pages: 189-193
Type: Article
More publications in: Food science and technology international = Ciencia y tecnología de alimentos internacional
Abstract
Characteristic vectors analysis has been used to reconstitute the transmittance spectrum of red wines measured in 0.2 cm path-length cells. We have verified that an accurate reconstitution of the spectrum is obtained with the mean vector and the first three characteristic vectors. Applying the outputs obtained to the colour calculation, tristimulus values are obtained as a function of transmittance measured at 420, 520 and 620 nm. The errors involved, measured in colour differ ences, are less than 3 CIELAB units in 97% of the cases.