Assessing the variability of colour-rendering indices using a random test-colour method / Pedro J. Pardo in COLORATION TECHNOLOGY, Vol. 133, N° 5 (10/2017)  

[article]  inCOLORATION TECHNOLOGY > Vol. 133, N° 5 (10/2017) . - p. 403-414 Titre : Assessing the variability of colour-rendering indices using a random test-colour method Type de document : texte imprimé Auteurs : Pedro J. Pardo, Auteur ; Maria Suero, Auteur ; Angel L. Pérez, Auteur ; Jairo Mena, Auteur ; Manuel Melgosa, Auteur Année de publication : 2017 Article en page(s) : p. 403-414 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Eclairage Evaluation Lumière artificielle Réflectance vision des couleurs Index. décimale : 535.6 Couleur Résumé : This paper addresses the way in which the random selection of different sets of samples influences the values of two colour-rendering indices analogous to the ones proposed by the International Commission on Illumination (CIE Publ. 13.3, 1995), Ra, and the Illuminating Engineering Society (IES Technical Memorandum TM-30-15, 2015), Rf. We report results found for 11 light sources, representative of current indoor and outdoor lighting, using a database with 12 123 spectral reflectance factors from real objects. For these 11 light sources, the differences between official Ra and Rf values and those computed using 100 iterations with 6000 random samples from our database proved to be in the range [?13, 2] and [?15, ?1], respectively, the highest differences corresponding to sources with narrow peaks in their spectral power distributions. For 100 random subsets of 10 samples from our database, the average standard deviations of the 11 light sources for indices analogous to Ra and Rf were 8 and 5 (or 2 and 1 using 110 samples) respectively. The standard deviations in computed Ra and Rf values, using subsets with different numbers of samples n, can be modelled as inversely proportional to the square root of n. We propose a method to estimate these standard deviations for n = 6000 using reduced sets of 10 spectral reflectance factors. Note de contenu : - EXPERIMENTAL METHODS : Samples - Light sources - Procedures - RESULTS AND DISCUSSION : CRI declared values vs values found with random sets of samples - Analysis of the internal standard deviations - Analysis of the external standard deviations - Relationship between internal and external standard deviations - Worked examples DOI : 10.1111/cote.12293 En ligne : https://drive.google.com/file/d/1qEqYpRA0wIvAxE0tK5GzX05o54QSak7_/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=29199 [article]

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Correlation of various light source quality indices with the colour discrimination capacity / Eduardo M. Cordero in COLORATION TECHNOLOGY, Vol. 127, N° 2 (2011)  

[article]  inCOLORATION TECHNOLOGY > Vol. 127, N° 2 (2011) . - p. 136-144 Titre : Correlation of various light source quality indices with the colour discrimination capacity Type de document : texte imprimé Auteurs : Eduardo M. Cordero, Auteur ; Pedro J. Pardo, Auteur ; Angel L. Pérez, Auteur ; Maria Suero, Auteur Année de publication : 2011 Article en page(s) : p. 136-144 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Sources de lumière vision des couleurs Index. décimale : 535.6 Couleur Résumé : The quality of a light source can be measured against various criteria – colour rendering, durability, etc. Another criterion is the quality of the colour of the objects it illuminates. Traditionally, this aspect has been associated almost exclusively with that of colour rendering, but the emergence of new light-emitting diode technology light sources has led to its being re-examined. In particular, questions have been raised as to whether colour quality can be calculated by a single measure. Instead, it seems a multidimensional index might better cover such concepts as colour rendering, colour discrimination, harmony, etc. The present work describes a visual colour discrimination experiment whose results corroborate the existence of a multidimensional index, even although some of the parameters commonly used to describe the quality of a light source might be correlated with each other. Note de contenu : - Test design - Apparatus - Sample - Colour discrimination tests DOI : 10.1111/j.1478-4408.2011.00288.x En ligne : http://onlinelibrary.wiley.com/doi/10.1111/j.1478-4408.2011.00288.x/pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=12228 [article]

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