Colorimetric analysis of black coated fabrics / R. Jafari in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 13, N° 5 (09/2016)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 13, N° 5 (09/2016) . - p. 871-882 Titre : Colorimetric analysis of black coated fabrics Type de document : texte imprimé Auteurs : R. Jafari, Auteur ; Seyed Hossein Amirshahi, Auteur ; S. A. Hosseini Ravandi, Auteur Année de publication : 2016 Article en page(s) : p. 871-882 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Colorimétrie Enduction textile Noir (couleur) Pigments Teinture -- Fibres textiles vision des couleurs Index. décimale : 667.9 Revêtements et enduits Résumé : In this article, two visual evaluation methods, i.e., the rank-ordering and pair comparison techniques, are sequentially used to investigate the effect of hue, lightness, and chroma values on the preference of blackness of 216 black coated fabrics. Based on the colorimetric attributes of specimens, the blackness preference of samples is assessed by 18 amateur observers through different predesigned experiments. Results show that while the lightness of samples performs a very important role in the blackness preference, it does not individually influence the results, and irrespective of the effect of chroma, observers perceive bluish-cyanish black fabrics as the preferred black samples. However, the specialized functionality of lightness is evident for black coated fabrics with very close hue and chroma attributes, and the blackness preference of samples increases when lightness is decreased. Finally, the validity of some suggested blackness indices is evaluated with comparison to the visual results. Note de contenu : - BLACKNESS PERCEPTION - EXPERIMENTAL : Materials - Methods - RESULTS AND DISCUSSION : Rank-ordering method - Pair comparison method - Observers performance - Evaluating the performance of suggested blackness indices DOI : 10.1007/s11998-016-9790-8 En ligne : http://link.springer.com/content/pdf/10.1007%2Fs11998-016-9790-8.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=27126 [article]

Réservation

Réserver ce document

Exemplaires (1)

Code-barres	Cote	Support	Localisation	Section	Disponibilité
18316	-	Périodique	Bibliothèque principale	Documentaires	Disponible

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]

Réservation

Réserver ce document

Exemplaires (1)

Code-barres	Cote	Support	Localisation	Section	Disponibilité
16561	-	Périodique	Bibliothèque principale	Documentaires	Disponible

Generation of virtual illuminants for a balanced colorimetric match / Farnaz Agahian in COLORATION TECHNOLOGY, Vol. 125, N° 1 (2009)  

[article]  inCOLORATION TECHNOLOGY > Vol. 125, N° 1 (2009) . - p. 14-21 Titre : Generation of virtual illuminants for a balanced colorimetric match Type de document : texte imprimé Auteurs : Farnaz Agahian, Auteur ; Seyed Hossein Amirshahi, Auteur Année de publication : 2009 Article en page(s) : p. 14-21 Note générale : Bibliogr. Langues : Anglais (eng) Index. décimale : 667.3 Teinture et impression des tissus Résumé : Colorimetric matching is employed under a series of virtual illuminants to produce more controllable and equalised colour-difference results under multiple illuminants. A method based on weighted principal component analysis of different artificial lights and the weighted mean is used to create a series of virtual illuminants. The weights were selected in a manner to create the virtual illuminants that benefit from the impact of a given illuminant, while the effects of other light sources on the formation of desired illuminants were also considered. The generated virtual illuminants were implemented in a colorimetric colour-matching trial. Using this method, by choosing suitable weights for different lighting conditions, more balanced colour-difference values were presented in the data set than was expected. The advantages of the suggested method were evaluated by the matching of a collection of 135 woollen samples under different virtual illuminants. DOI : 10.1111/j.1478-4408.2008.00170.x En ligne : http://onlinelibrary.wiley.com/doi/10.1111/j.1478-4408.2008.00170.x/pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=4820 [article]

Réservation

Réserver ce document

Exemplaires (1)

Code-barres	Cote	Support	Localisation	Section	Disponibilité
011096	-	Périodique	Bibliothèque principale	Documentaires	Disponible

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]

Réservation

Réserver ce document

Exemplaires (1)

Code-barres	Cote	Support	Localisation	Section	Disponibilité
14163	-	Périodique	Bibliothèque principale	Documentaires	Disponible

Optimal eigenvectors of spectral datasets : sequential selection from one set vs a collection from two sets / Morteza Maali Amiri in COLORATION TECHNOLOGY, Vol. 132, N° 6 (12/2016)  

[article]  inCOLORATION TECHNOLOGY > Vol. 132, N° 6 (12/2016) . - p. 441 448 Titre : Optimal eigenvectors of spectral datasets : sequential selection from one set vs a collection from two sets Type de document : texte imprimé Auteurs : Morteza Maali Amiri, Auteur ; Seyed Hossein Amirshahi, Auteur Année de publication : 2016 Article en page(s) : p. 441 448 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Analyse des données Analyse vectorielle Spectroscopie de réflectance Index. décimale : 667.3 Teinture et impression des tissus Résumé : In this paper, the influence of spectral datasets and the method of selection of the corresponding feature vectors on the compression and reconstruction of data is scrutinised. To fulfil this aim, two different sets of reflectance data with the least spectral similarity are selected from different sets of spectral databases and the most optimal eigenvectors are chosen using different strategies. Six and 12 arrangements of eigenvectors obtained from different individual or combined databases are then used for the compression of reflectance spectra of learning sets, as well as those that have not been used in extraction of eigenvectors. The validity of the desired reduced subspaces is assessed by computing the spectral errors between the actual and the reconstructed spectra of samples of learning sets. Moreover, the efficiencies of designed compressed subspaces are evaluated through the numbers of out-of-range reconstructed spectra, as well as the spectral and colorimetric deviations between the actual and compressed-reconstructed reflectance spectra of samples of datasets that were not employed in learning sequence. The results show that in the restricted subspaces, i.e. six-dimensional subspace, the most effective results are achieved when the reduced subspace is created from a collection of two separate sets of eigenvectors of two different datasets with the maximum degree of dissimilarity, and the reduced spaces that have been made from six eigenvectors of individual datasets lead to higher errors. Note de contenu : - EXTRACTION AND SELECTION OF AN OPTIMAL EIGENVECTOR SET - EXPERIMENT AND PROCEDURE - RESULTS AND DISCUSSION : Compression-reconstruction of Munsell and textile databases - Compression-reconstruction of other datasets DOI : 10.1111/cote.12236 En ligne : https://drive.google.com/file/d/12YHaAeS72nA2RyXGU06tlAD2AeX_mJtu/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=27281 [article]

Réservation

Réserver ce document

Exemplaires (1)

Code-barres	Cote	Support	Localisation	Section	Disponibilité
18506	-	Périodique	Bibliothèque principale	Documentaires	Disponible

Spectral dependence of colorimetric characterisation of scanners / Hossein Fashandi in COLORATION TECHNOLOGY, Vol. 127, N° 4 (2011)

Permalink

Variation in the decisions of observers regarding the ordering of white samples / R. Jafari in COLORATION TECHNOLOGY, Vol. 124, N° 2 (2008)  

Permalink

---

1 (1 - 7 / 7)