A general metric for the magnitude of observer metamerism / Boris Sluban in COLORATION TECHNOLOGY, Vol. 130, N° 5 (10/2014)  

[article]  inCOLORATION TECHNOLOGY > Vol. 130, N° 5 (10/2014) . - p. 368-375 Titre : A general metric for the magnitude of observer metamerism Type de document : texte imprimé Auteurs : Boris Sluban, Auteur ; Peyvandi Shahram, Auteur ; Shirin Charmchi Avval, Auteur ; Seyed Hossein Amirshahi, Auteur Année de publication : 2014 Article en page(s) : p. 368-375 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Analyse mathématique Analyse numérique Métamérisme vision des couleurs Index. décimale : 667.3 Teinture et impression des tissus Résumé : Observer metamerism is defined as a property of a pair of spectrally different stimuli having the same colour sensation for an individual (reference) observer. Frequently, samples in this pair no longer match if the observer is changed. In this article, a linear approximation formula is developed that predicts a metameric effect caused by small changes in the observer's colour-matching functions. This approximation formula enables a general metric of observer metamerism, the observer metamerism potential, to be defined that is independent of any particular deviated observer but still provides a close link to ‘observer-metameric’ colour difference. Numerical experiments were conducted to investigate the correlation between the observer metamerism potential and the maximum of 53 metameric colour differences caused by the change from the colour-matching functions of CIE standard 10° observer to the colour-matching functions of 49 Stiles and Burch's real 10° test observers. The proposed general metric, together with a previous metric proposed by the present authors, the illuminant metamerism potential, could be taken as a quantitative measure of the performance of spectral approximation methods. Note de contenu : - Approximation of the Colour change caused by change in the observer's CMFs - Definition and calculation of the observer metamerism potential - Numerical examples DOI : 10.1111/cote.12100 En ligne : https://onlinelibrary.wiley.com/doi/epdf/10.1111/cote.12100 Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=22076 [article]

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Illuminant metamerism potentiality of metameric pairs / Seyed Hossein Amirshahi in COLORATION TECHNOLOGY, Vol. 128, N° 5 (2012)  

[article]  inCOLORATION TECHNOLOGY > Vol. 128, N° 5 (2012) . - p. 341-349 Titre : Illuminant metamerism potentiality of metameric pairs Type de document : texte imprimé Auteurs : Seyed Hossein Amirshahi, Auteur ; Peyvandi Shahram, Auteur ; Boris Sluban, Auteur Année de publication : 2012 Article en page(s) : p. 341-349 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Colorimétrie Métamérisme vision des couleurs Index. décimale : 667.3 Teinture et impression des tissus Résumé : Indices for describing the degree of metamerism are based on either the deviation of the spectra of a metameric pair or the colour difference of the pair under test conditions. The magnitude of illuminant metamerism is commonly evaluated by measuring the colour difference under the test illuminant. The calculated colour differences absolutely vary with the selected test illuminants, so the measured (special) index of metamerism could be considered as a test-illuminant-dependent value. The spectral-based indices of metamerism act as a single-number value, but most of them are criticised for their poor correlation with visual assessment. In this paper, a general metric is developed for evaluating the upper limit of the degree of illuminant metamerism. The suggested approach combines the advantages of general and special indices, avoiding their drawbacks at the same time. The performance of the formula is analysed in a number of numerical experiments, as well as by practical testing. Note de contenu : - Definition of Illuminant Metamerisme Potentiality - The magnitude of Colorimetric Shift - The magnitude of Colour Difference - Illuminant Metamerism Potentiality of a Metameric Pair - The reliability of Metamerisme Potentiality - Numerical Experiment - Practical experiment - Printer Characterisation - Sample preparation - Reliability of Illuminant Metamerism Potentiality of a Parameric Pair DOI : 10.1111/j.1478-4408.2012.00386.x En ligne : http://onlinelibrary.wiley.com/doi/10.1111/j.1478-4408.2012.00386.x/pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=15801 [article]

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