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The quality of light sources / Ming Ronnier Luo in COLORATION TECHNOLOGY, Vol. 127, N° 2 (2011)  

[article]  inCOLORATION TECHNOLOGY > Vol. 127, N° 2 (2011) . - p. 75-87 Titre : The quality of light sources Type de document : texte imprimé Auteurs : Ming Ronnier Luo, Auteur Année de publication : 2011 Article en page(s) : p. 75-87 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Lumière visible Mesures physiques Index. décimale : 535 Lumière visible Résumé : This paper describes physical measures for quantifying the quality of light sources and their characteristics. Typical light sources, including incandescent lamps, fluorescent lamps and light emitting diodes, are first introduced and their performance is compared. The CIE colour specification system is then described, including physical quantities for specifying light sources such as colour temperature, spectral power distribution, luminance, illuminance, luminous efficacy, chromaticity coordinates, uniform colour spaces, a colour difference formula and a colour appearance model. Finally, the CIE colour rendering index, together with recent developments towards a new index, including CRI-CAM02UCS, is described. Note de contenu : TYPES OF LAMPS : Incandescent lamps - Fluorescent lamps - Light-emitting diode sources THE CIE COLOUR SPECIFICATION SYSTEM : Light CIE STANDARD ILLUMINANTS : CIE illuminants A, B, C, and D - CIE F illuminants - Object - Visual system TRISTIMULUS VALUES UNIFORM COLOUR SPACE AND COLOUR-DIFFERENCE FORMULA : Uniform colour scale diagram - CIEU*V*W* colour space and colour-difference formula - CIELAB colour spaces and colour-difference formula COLOUR APPEARANCE MODELS COLOUR RENDERING INDEX : CIE colour redenring index - Recent developments in CIE CRI-CAM02UCS COMPARISON OF THE PERFORMANCE OF INDOOR LAMPS DOI : 10.1111/j.1478-4408.2011.00282.x En ligne : http://onlinelibrary.wiley.com/doi/10.1111/j.1478-4408.2011.00282.x/pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=11104 [article]

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Quality of the daylight sources for industrial colour control / Robert Hirschler in COLORATION TECHNOLOGY, Vol. 127, N° 2 (2011)  

[article]  inCOLORATION TECHNOLOGY > Vol. 127, N° 2 (2011) . - p. 88-100 Titre : Quality of the daylight sources for industrial colour control Type de document : texte imprimé Auteurs : Robert Hirschler, Auteur ; Danielle F. Oliveira, Auteur ; Lincoln C. Lopes, Auteur Année de publication : 2011 Article en page(s) : p. 88-100 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Colorimétrie Sources de lumière vision des couleurs Index. décimale : 752 Couleur Résumé : Information is presented based on measurements, published literature and the findings of the CIE Technical Committee TC1-44 Practical Daylight Sources for Colorimetry. For visual colour control, filtered incandescent lamps, filtered xenon short-arc lamps, fluorescent lamps and light-emitting diode sources are used as daylight simulators, while, in today’s industrial reflectance spectrophotometers, pulsed xenon lamps are used. Practical daylight simulators exist with characteristics satisfying the major national and international standards, but most of the commercially available colour-matching booths do not comply with these standards, in spite of the claims made by manufacturers. For instrumental control, well-maintained and calibrated sources may provide acceptable daylight simulation. Note de contenu : EVALUATION OF DAYLIGHT SIMULATORS : Methods based on spectral comparison - Methods based on sample evaluation EXPERIMENTAL : Instruments used - Booths, lamps and instruments measured - Normalisation of spectral irradiance values RESULTS AND DISCUSSION : Comparison of irradiance measurements performed with different input optics - Uniformiti of illumination inside colour-matching booths - Daylight simulators for the visual appraisal of colour - Daylight simulators in colour-measuring spectrophotometers DOI : 10.1111/j.1478-4408.2011.00283.x En ligne : http://onlinelibrary.wiley.com/doi/10.1111/j.1478-4408.2011.00283.x/pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=11105 [article]

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On measuring task performance / Peter R. Boyce in COLORATION TECHNOLOGY, Vol. 127, N° 2 (2011)  

[article]  inCOLORATION TECHNOLOGY > Vol. 127, N° 2 (2011) . - p. 101-113 Titre : On measuring task performance Type de document : texte imprimé Auteurs : Peter R. Boyce, Auteur Année de publication : 2011 Article en page(s) : p. 101-113 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Analyse spectrale Colorimétrie Mesures optiques Sources de lumière vision des couleurs Index. décimale : 535.6 Couleur Résumé : This paper describes the approaches that can be used to measure task performance and illustrates them by reviewing what is known about the impacts of illuminance and light source spectral power distribution on task performance. The approaches can vary from real tasks studied in the field through simulated tasks or standard tasks to basic visual functions measured in the laboratory. Each approach has different strengths and weaknesses. Understanding what these are is essential for anyone proposing to measure task performance or wishing to appreciate what such performance measurements imply. The review of the effects of spectral power distribution on task performance reveals that there is still much to learn. The effects of spectral power distribution on basic visual functions are well established, but, for tasks where the role of colour is to enhance visibility and conspicuity, there is little more than a qualitative understanding. As for the effects of spectral power distribution on task performance when operating through perception, this is largely unexplored territory. Note de contenu : - Light and task performance - Methods of measurement - Choosing a method : What is the problem I am trying to adress ? - What is already known ? - What variables are you interested in ? - SPD and visual performance DOI : 10.1111/j.1478-4408.2011.00284.x En ligne : http://onlinelibrary.wiley.com/doi/10.1111/j.1478-4408.2011.00284.x/pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=12224 [article]

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Lighting in offices : lamp spectrum and brightness / Steve Fotios in COLORATION TECHNOLOGY, Vol. 127, N° 2 (2011)  

[article]  inCOLORATION TECHNOLOGY > Vol. 127, N° 2 (2011) Titre : Lighting in offices : lamp spectrum and brightness Type de document : texte imprimé Auteurs : Steve Fotios, Auteur Année de publication : 2011 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Bureaux -- Eclairage Lampes Lumière visible Répartition spectrale énergétique Sources de lumière Index. décimale : 621.32 Eclairage Résumé : In UK offices, a ubiquitous target for lighting ‘design’ is an illuminance of 500 lux on the working plane. This article questions the basis for the 500 lux standard and suggests that a reduced illuminance would not affect visual performance. However, lighting design should also consider expectations and if a reduced illuminance leads to perceived gloom then this could affect motivation to carry out work tasks. Evidence is presented which suggests that the brightness of a space may be maintained, despite a reduction in illuminance, through the choice of lamp spectral power distribution. Note de contenu : - Lighting and productivity : Task illuminance - Task motivation - Maintaining brightness at lower illuminance - Empirical evidence of lamp SPD and brightness - Characterising lamp SPD and spatial brightness DOI : 10.1111/j.1478-4408.2011.00285.x En ligne : http://onlinelibrary.wiley.com/doi/10.1111/j.1478-4408.2011.00285.x/pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=12225 [article]

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Review of retail store lighting : implications for colour control of products / David Hinks in COLORATION TECHNOLOGY, Vol. 127, N° 2 (2011)  

[article]  inCOLORATION TECHNOLOGY > Vol. 127, N° 2 (2011) . - p. 121-128 Titre : Review of retail store lighting : implications for colour control of products Type de document : texte imprimé Auteurs : David Hinks, Auteur ; Renzo Shamey, Auteur Année de publication : 2011 Article en page(s) : p. 121-128 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Lumière visible Magasins -- Eclairage Sources de lumière Index. décimale : 621.32 Eclairage Résumé : Lighting variables directly impact all areas of colour science. Lighting is of critical concern to the effective and consistent control of the perceived colour of all products. It is therefore important that all stakeholders involved in managing a commercial supply chain, including product design, colour standards development, manufacture and point of sale, work to understand and control the lighting environment during each stage of a product’s life cycle. New examples of lighting variability in a small and large US retail chain store are presented to illustrate key concepts. Some of the recent published work on retail lighting is reviewed, as well as some of the likely future directions of retail lighting in terms of environmental and technology development. Note de contenu : - Key light sources - Does variability in retail lighting impact sales ? - Disconnection between store design and colour management - Lighting measurements - Assessment of the area lighting in a small store - Assessment of the lighting of a large retail chain store - Future developments DOI : 10.1111/j.1478-4408.2011.00286.x En ligne : http://onlinelibrary.wiley.com/doi/10.1111/j.1478-4408.2011.00286.x/pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=12226 [article]

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Evaluation of the CIE colour rendering index / Cheng Li in COLORATION TECHNOLOGY, Vol. 127, N° 2 (2011)  

[article]  inCOLORATION TECHNOLOGY > Vol. 127, N° 2 (2011) . - p. 129-135 Titre : Evaluation of the CIE colour rendering index Type de document : texte imprimé Auteurs : Cheng Li, Auteur ; Ming Ronnier Luo, Auteur ; Guihua Cui, Auteur ; Changjun Li, Auteur Année de publication : 2011 Article en page(s) : p. 129-135 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Colorimétrie Diodes électroluminescentes Sources de lumière vision des couleurs Index. décimale : 535.6 Couleur Résumé : An experiment was carried out to evaluate the change of colour appearance of samples under a reference illuminant and four light-emitting diode light sources. The results were used to evaluate the present CIE colour rendering index and other calculation methods. It was found that the present colour rendering index did not predict the visual data accurately. An index based on CAM02-UCS embedded with a reliable chromatic adaptation transform and a uniform colour space gave the best performance. Note de contenu : EXPERIMENTAL : Testing light sources - Testing samples - Viewing conditions - Data analysis RESULTS : Observer variability - The models' performances DOI : 10.1111/j.1478-4408.2011.00287.x En ligne : http://onlinelibrary.wiley.com/doi/10.1111/j.1478-4408.2011.00287.x/pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=12227 [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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