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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Let there be light ! in POLYMERS PAINT COLOUR JOURNAL - PPCJ, Vol. 209, N° 4655 (10/2019)  

[article]  inPOLYMERS PAINT COLOUR JOURNAL - PPCJ > Vol. 209, N° 4655 (10/2019) . - p. 18-19 Titre : Let there be light ! Type de document : texte imprimé Année de publication : 2019 Article en page(s) : p. 18-19 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Eclairage Lumière artificielle Lumière du jour Métamérisme vision des couleurs Index. décimale : 535.6 Couleur Résumé : The author reports on how to master the challenge of bringing true daylight into the laboratory. Uniform colour is directly associated with high quality and influences our purchasing decision. This is especially true for multi-component products consisting of different materials and/or being produced by different suppliers. The human eye is often the final judge for approving a new design. Therefore, the visual inspection conditions need to be standardised to guarantee repeatable visual results. The most important colour match is under naturel daylight. The CIE defined several standard D illuminants with D65 being the most important one. The lames used in a light booth must simulate D65 as close as possible. Until now, fluorescent tubes were used to simulate D65. A new unique lighting setup is now able to achieve class A quality by simulating CIE D65 with a smart combination of filtered halogen lamps and LEDs. Note de contenu : - CIE metamerism index-MI - Standard illuminant D65 - Best in class daylight with Byko-spectra pro - Table 1 : Categorisation of MIvis and MIuv depending on colour difference formula - Fig. 1 : Daylight simulation with fluorescent tube - Fig. 2 : Daylight simulation with combination of filtered halogen lamps with and without LEDs En ligne : https://drive.google.com/file/d/1alVLylxoXHyHUX6syiBh9g1W1glwcGDD/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=33123 [article]

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Metamerism and its management / Filippo Busolo in POLYMERS PAINT COLOUR JOURNAL - PPCJ, Vol. 205, N° 4614 (11/2015)  

[article]  inPOLYMERS PAINT COLOUR JOURNAL - PPCJ > Vol. 205, N° 4614 (11/2015) . - p. 22-23 Titre : Metamerism and its management Type de document : texte imprimé Auteurs : Filippo Busolo, Auteur Année de publication : 2015 Article en page(s) : p. 22-23 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Métamérisme vision des couleurs Index. décimale : 535.6 Couleur Résumé : Insight into the metamerism phenomenon and how it plays an important role in the control and evaluation of colour. Note de contenu : FIGURES : 1. Metamerism : the colour perception of two shades in the same under a lighting condition but not under a second illuminant - 2. Spectral power distribution for the CIE illuminant D65 and A - 3. Example of standard colour En ligne : https://drive.google.com/file/d/1qysqegzLNbw-RWDyL_sFhSA5Qw-vLYK3/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=24917 [article]

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A review of solid-state lighting and its impact on the marketing and production of decorative coatings / Danny C. Rich in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 13, N° 1 (01/2016)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 13, N° 1 (01/2016) . - p. 1-9 Titre : A review of solid-state lighting and its impact on the marketing and production of decorative coatings Type de document : texte imprimé Auteurs : Danny C. Rich, Auteur Année de publication : 2016 Article en page(s) : p. 1-9 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Eclairage Métamérisme Revêtements décoratifs Index. décimale : 667.9 Revêtements et enduits Résumé : Solid-state lighting in the form of light emitting diode lamps is quickly taking over the world as replacements for existing lower efficiency lamps. The lighting standards, which phased in from 2012 to 2014, do not ban incandescent or any specific lamp type, but they do require that lamps need to use about 25% less energy. The bipartisan Energy Independence and Security Act of 2007 (EISA 2007) established these efficiency standards. Many commercial lamps meet these new standards, including halogen incandescent filament, CFLs, and LEDs. The new bulbs provide a wide range of choices in color and brightness, and many of them last much longer than traditional lamps. However, the spectral distribution of flux from some of these new lamps do not match or even correspond to the spectral power distribution of traditional office and home lighting. In this review, the impact of the new lamp lights on the design, marketing, and production of modern decorative coatings is assessed. The decorative coatings industry has followed recommended guidelines for many decades, producing color-matches that are acceptable under a series of standard illuminants (D65, CWF, A) which are representative of the lamp lights in most common facilities. The new solid-state lamps do not render object colors in ways similar to the currently adopted standardized illuminants. The primary obstacle to the coatings manufacturer is the lack of standards on how to test color-matches for quality conformance under the new lamp lights. As the energy efficient lighting industry is currently still in a technologically developing phase, it appears that it will be some time before any agreements on the characteristics of modern lamp light will be reached. Therefore, guidance is provided on creating and/or using illuminant data representative of these lamps until official reference illuminants are published. Note de contenu : - Lighting in point of sale matching - What the coatings industry can do to adapt to SSL DOI : 10.1007/s11998-015-9704-1 En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-015-9704-1.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=25367 [article]

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The impact of viewing conditions on observer variability for cross-media colour reproduction / Yoon Ji Cho in COLORATION TECHNOLOGY, Vol. 135, N° 3 (06/2019)  

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