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What scene information is needed for models of colour appearance in the natural world ? / John J. McCann in COLORATION TECHNOLOGY, Vol. 137, N° 1 (02/2021)  

[article]  inCOLORATION TECHNOLOGY > Vol. 137, N° 1 (02/2021) . - p. 5-14 Titre : What scene information is needed for models of colour appearance in the natural world ? Type de document : texte imprimé Auteurs : John J. McCann, Auteur Année de publication : 2021 Article en page(s) : p. 5-14 Note générale : Bibliogr. Langues : Anglais (eng) Index. décimale : 535.6 Couleur Résumé : Colorimetry is an essential tool in every part of colour. This article looks over our shoulders at the colour research of Maxwell, Wright, Land and Wyszecki to build a framework for colour. Then, the article looks forward to the needs of digital imaging's future. Colour is the fusion of today's imaging technology with our understanding of colour. Molecular physical chemistry describes the light–matter interactions, while human colour is controlled by neurons that compare light from the entire scene, covering a nearly 180° visual angle. This article's question asks about the information required by a future Model of Colour Appearance that is able to predict any scene : all natural scenes and any experimental display. Note de contenu : - FRAMEWORK : Light–matter interactions - Neural spatial comparisons - COLORIMETRY - APPEARANCE SCIENCE : Neural spatial comparisons - COLOUR TRANSFORMATIONS, CALCULATIONS, AND MODELS : Position in colour space - Uniform colour space (white column) - Colour constancy (white column) - Spatial: contrast and assimilation (white column) - Hybrid : relative colorimetry transformations (grey column) - CIELAB and CIELUV uniform colour spaces and colour difference formulae—1976 (grey column) - CIECAM colour appearance models (grey column) - Colour constancy (grey column) - Spatial : contrast and assimilation - Summary of relative colorimetry (grey column) - WYSZECKI'S WARNING DOI : 10.1111/cote.12502 En ligne : https://onlinelibrary.wiley.com/doi/epdf/10.1111/cote.12502 Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=35582 [article]

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Colour design and non-image-forming effects in humans : An open issue / Maurizio Rossi in COLORATION TECHNOLOGY, Vol. 137, N° 1 (02/2021)  

[article]  inCOLORATION TECHNOLOGY > Vol. 137, N° 1 (02/2021) . - p. 16-21 Titre : Colour design and non-image-forming effects in humans : An open issue Type de document : texte imprimé Auteurs : Maurizio Rossi, Auteur Année de publication : 2021 Article en page(s) : p. 16-21 Note générale : Bibliogr. Langues : Anglais (eng) Index. décimale : 535.6 Couleur Résumé : Nowadays in industrialised countries, human beings spend 80-90% of their time indoors. Under these conditions the light, the colours, ie the perceived image, differs considerably from the outdoors. But this also influences the NIF (non-image-forming) effects on our nervous system, such as regulation of the circadian rhythm and other physiological effects. The risks to health arising from NIF effects are highlighted. Even though extensive neurophysiological research has demonstrated the importance of proper NIF management for human health, use of the latter is virtually absent in the design practice. Therefore, we highlight the unresolved research challenges which prevent the development of complete models, particularly useful in defining lighting and, above all, colours in indoor environments, to correctly manage NIF effects. Note de contenu : - Circadian system disorders and health problems - Problem 1 : Light spectrum and quantification of NIF effects - Problem 2 : Colours and NIF effects DOI : 10.1111/cote.12501 En ligne : https://onlinelibrary.wiley.com/doi/epdf/10.1111/cote.12501 Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=35583 [article]

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Colour after colorimetry / Alessandro Rizzi in COLORATION TECHNOLOGY, Vol. 137, N° 1 (02/2021)  

[article]  inCOLORATION TECHNOLOGY > Vol. 137, N° 1 (02/2021) . - p. 22-28 Titre : Colour after colorimetry Type de document : texte imprimé Auteurs : Alessandro Rizzi, Auteur Année de publication : 2021 Article en page(s) : p. 22-28 Note générale : Bibliogr. Langues : Anglais (eng) Index. décimale : 535.6 Couleur Résumé : This paper presents a critical overview of some of the uses, misuses and open problems in colour measurement, characterisation and reproduction. A series of ground truths, pitfalls and open problems regarding colorimetry and its relationship with human colour vision is presented. Note de contenu : - Colour formation - Colorimetry - Colour matching - What really arrives at the retina : why colour is not pointwise - The effects of the spatial arrangement on scene content - A leak from the aperture mode - Colour constancy DOI : 10.1111/cote.12496 En ligne : https://onlinelibrary.wiley.com/doi/epdf/10.1111/cote.12496 Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=35584 [article]

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How colour-deficient observers see things, or not / Reiner Eschbach in COLORATION TECHNOLOGY, Vol. 137, N° 1 (02/2021)  

[article]  inCOLORATION TECHNOLOGY > Vol. 137, N° 1 (02/2021) . - p. 29-32 Titre : How colour-deficient observers see things, or not Type de document : texte imprimé Auteurs : Reiner Eschbach, Auteur Année de publication : 2021 Article en page(s) : p. 29-32 Note générale : Bibliogr. Langues : Anglais (eng) Index. décimale : 535.6 Couleur Résumé : Colour deficiency or, colloquially, colour blindness, is common and has been observed and described in the scientific literature for ca. 200 years. In more recent times, algorithms have been developed that simulate the effect of colour deficiency to a colour-normal observer. Sometimes these algorithms are used to indicate potential problems in the colour design, but often the implicit assumption is that a colour-deficient observer actually sees things that way. But do they ? This paper questions some of the underlying assumptions of the algorithms. Note de contenu : - Measuring colour deficiency : Why do we need a colour deficiency test ? - Simulating a CDO - Image preference and CDOS - CDOS and music - Fig. 1 : An original image and a simulation of the experience of a deuteroanomalous colour-deficient (D-type) observer - Fig. 2 : Farnsworth result for a D-type CDO. Note that this observer has a sufficiently strong derivation from colour-normal vision that the actual measured values are outside the standard Farnsworth range (in the lower right of the chart) DOI : 10.1111/cote.12494 En ligne : https://onlinelibrary.wiley.com/doi/epdf/10.1111/cote.12494 Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=35585 [article]

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Revisiting the Optical Society of America Uniform Color Scales system : past, present and future challenges / Manuel Melgosa in COLORATION TECHNOLOGY, Vol. 137, N° 1 (02/2021)  

[article]  inCOLORATION TECHNOLOGY > Vol. 137, N° 1 (02/2021) . - p. 33-37 Titre : Revisiting the Optical Society of America Uniform Color Scales system : past, present and future challenges Type de document : texte imprimé Auteurs : Manuel Melgosa, Auteur ; Dibakar Pant, Auteur ; Gabriele Simone, Auteur Année de publication : 2021 Article en page(s) : p. 33-37 Note générale : Bibliogr. Langues : Anglais (eng) Index. décimale : 535.6 Couleur Résumé : As a tribute to Claudio Oleari (1944-2018), in this article we remember some of his ideas about the role of physics and engineering in modern colour science. In particular, we consider his emphasis on the strong content of the work carried out during 1947-1974 by the Committee on Uniform Scales of the Optical Society of America. Oleari considered the Optical Society of America Uniform Color scales system a very useful basis for new developments in colour science, including approximately uniform colour spaces, colour difference formulae and chromatic adaptation transforms. Papers published by Oleari and colleagues constitute an original alternative approach to the current generalised assumption of CIELAB made by most researchers and practitioners of colour science. We should seek a deeper understanding of colour vision to allow the development of new colour spaces, in which colour appearance could be more neatly expressed. Note de contenu : - OSA-UCS system colour atlas and colour spaces - Colour differences and chromatic adaptation DOI : 10.1111/cote.12509 En ligne : https://onlinelibrary.wiley.com/doi/epdf/10.1111/cote.12509 Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=35586 [article]

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Colour appearance in immersive three-dimensional virtual environments / Francisco Diaz-Barrancas in COLORATION TECHNOLOGY, Vol. 137, N° 1 (02/2021)  

[article]  inCOLORATION TECHNOLOGY > Vol. 137, N° 1 (02/2021) . - p. 38-43 Titre : Colour appearance in immersive three-dimensional virtual environments Type de document : texte imprimé Auteurs : Francisco Diaz-Barrancas, Auteur ; Halina Carmen Cwierz, Auteur ; Pedro J. Pardo, Auteur ; Angel L. Pérez, Auteur ; Maria Isabel Suero, Auteur Année de publication : 2021 Article en page(s) : p. 38-43 Note générale : Bibliogr. Langues : Anglais (eng) Index. décimale : 535.6 Couleur Résumé : Technology is constantly evolving and, consequently, all the technological advances taking place are regularly integrated into the daily life of society. During recent years, there has been a trend towards virtual resources such as teleworking, telemedicine and e-commerce. In many countries, this virtualisation process has been accelerated by the changing circumstances caused by the COVID-19 pandemic. In any case, there is a growing demand for virtual systems, and virtual reality is a suitable field for the application of a multitude of solutions. However, advances in virtual reality occur without any regard to colour science, and there are several challenges to be overcome to improve the visual appearance and fidelity of colour reproduction in all types of related devices. This paper discusses three open issues related to the visual appearance and visual fidelity of virtual reality systems. We believe it is necessary to direct future research efforts in each of these directions to secure improvements in the visual fidelity of virtual reality systems. Note de contenu : - Measurement of optical properties related to colour appearance - Real-time 3D rendering images for VR - Colour appearance models applied to rendered scenes - Fig. 1 : Graphical representation of BSDF = BRDF + BTDF, where BSDF is the bidirectional scattering distribution function, BRDF is the bidirectional reflectance distribution function, and BTDF is the bidirectional transmittance distribution function - Fig. 2 : Example of a photorealistic reproduction of a real scene produced with POV-Ray 3.6 - Fig. 3 : ColorChecker simulation using a two spectral peaks light source in a virtual reality system and a real picture of the ColorChecker using a two spectral peaks light source - Fig. 4 : Real picture of a real scene inside a light booth, (centre) screen capture of the simulation of a real scene in a virtual reality system (VRS) without any post-processing, and screen capture of the simulation of a real scene in a VRS processed with an iCAM06 appearance model DOI : 10.1111/cote.12513 En ligne : https://onlinelibrary.wiley.com/doi/epdf/10.1111/cote.12513 Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=35587 [article]

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Cultural and architectural heritage conservation and restoration : which colour ? / Marco Gaiani in COLORATION TECHNOLOGY, Vol. 137, N° 1 (02/2021)  

[article]  inCOLORATION TECHNOLOGY > Vol. 137, N° 1 (02/2021) . - p. 44-55 Titre : Cultural and architectural heritage conservation and restoration : which colour ? Type de document : texte imprimé Auteurs : Marco Gaiani, Auteur ; Fabrizio Ivan Apollonio, Auteur ; Andrea Ballabeni, Auteur Année de publication : 2021 Article en page(s) : p. 44-55 Note générale : Bibliogr. Langues : Anglais (eng) Index. décimale : 535.6 Couleur Résumé : Colours play a crucial role in the field of architectural heritage. Colour analysis and colour rendition are involved in several critical facets of heritage preservation, conservation and restoration. These aspects are related to accurate documentation and an accurate representation of heritage artefacts and architectural works. The aim of this paper is to describe critical issues and open problems of the processes involved in this field. Documentation is performed in multiple ways, acquiring heterogeneous data ranging from archival images, photographs, drawings using various consumer or professional instruments (eg, digital cameras and spectrophotometers). The reliability of colour acquisition might be influenced by instrumental reasons (the technology used to acquire colour information), by environmental changes (architectural heritage surveys are often performed outdoors), by morphology (complex architectural objects are characterised by concavities and convexities which complicate the reflection evaluation), or by materials (showing different reflection, porosity and transparency indexes). Identification of materials, such as colorants, pigments and dyes, is also a vital process in the heritage field. Colour information could be used as an approach to the identification of materials, but these methods are still under development, and many issues need to be solved to achieve reliable results. Visualisation techniques of a heritage artefact also present the problem of the correctness of the colour representation. Several problems need to be faced in this context: the reliability of the acquisition, colour management of the rendering software, model complexity, and fragmentation of the devices upon which the model is visualised. Note de contenu : - ARCHITECTURAL HERITAGE AND "open air" ARCHAEOLOGY COLOUR DOCUMENTATION : The general problem - Colour documentation using instruments - Colour documentation using images - Colour appearance : identification and visualisation - MATERIAL COLOUR IDENTIFICATION AND DECAY ANALYSIS USING COLOUR : The material colour and decay analysis general problem - The case of drawings : colour analyses - The case of metal-point identification in the Leonardo da Vinci drawings - The case of the use of multispectral analysis to support restorer activity - THE TARGET-BASED "COLOUR CHARACTERISATION PROBLEM" : An overview - The target selection problem - Target use-related problems - The δE formula problem - The reference conditions problem to measure colour reproduction accuracy - The assumptions of the CIE system limit in the heritage field - 3D MODEL COLOUR ACQUISITION, MANAGEMENT AND VISUALISATION PROBLEMS : Overview of the surface perception digital visualisation background - 3D model colour acquisition technique limits - 3D model colour management limits - The colour space selection problem - The BRDF representation and visualisation problem - The observer environment problem DOI : 10.1111/cote.12499 En ligne : https://onlinelibrary.wiley.com/doi/epdf/10.1111/cote.12499 Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=35588 [article]

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The limits of colorimetry in cultural heritage applications / Alice Plutino in COLORATION TECHNOLOGY, Vol. 137, N° 1 (02/2021)  

[article]  inCOLORATION TECHNOLOGY > Vol. 137, N° 1 (02/2021) . - p. 56-63 Titre : The limits of colorimetry in cultural heritage applications Type de document : texte imprimé Auteurs : Alice Plutino, Auteur ; Gabriele Simone, Auteur Année de publication : 2021 Article en page(s) : p. 56-63 Note générale : Bibliogr. Langues : Anglais (eng) Index. décimale : 535.6 Couleur Résumé : Colours in cultural heritage are not only means of expression, but also materials with physical and chemical properties. Since the beginning of the current century, colorimetry has become a fundamental field aiming at restoring, preserving and valorising the art works. There are different colorimetric applications in cultural heritage (eg, from light design to digitisation and modelling), and the variety of cultural material is extremely wide, from statues and frescoes, to old book and films. In this heterogeneous context, the development of instruments, measurements and tools faithful to the original objects are fundamental to correctly reproducing and representing materials, contrast and colours of the works under analysis. In this work, we will analyse the main limits of colorimetry applied in cultural heritage domain considering a variety of applications on physical colour representation and on digital colour reproduction. We will focus on main state-of-the-art studies, regulations and guidelines for objects illumination, colour analysis and digitisation workflow showing some practical example of issues encountered by standard pointwise colorimetry. Note de contenu : - Physical colour representation - Digital colour reproduction DOI : 10.1111/cote.12500 En ligne : https://onlinelibrary.wiley.com/doi/epdf/10.1111/cote.12500 Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=35589 [article]

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Is it really possible to compensate for colour blindness with a filter ? / Eva M. Valero in COLORATION TECHNOLOGY, Vol. 137, N° 1 (02/2021)  

[article]  inCOLORATION TECHNOLOGY > Vol. 137, N° 1 (02/2021) . - p. 64-67 Titre : Is it really possible to compensate for colour blindness with a filter ? Type de document : texte imprimé Auteurs : Eva M. Valero, Auteur ; Rafael Huertas, Auteur ; Miguel Ángel Martínez-Domingo, Auteur ; Luis Gómez-Robledo, Auteur ; Javier Hernández-Andrés, Auteur ; Juan Luis Nieves, Auteur ; Javier Romero, Auteur Année de publication : 2021 Article en page(s) : p. 64-67 Note générale : Bibliogr. Langues : Anglais (eng) Index. décimale : 535.6 Couleur Résumé : In the last 2 decades, there has been a resurgence of the idea that passive aids such as colour filters can be an effective solution to compensate colour vision deficiency (CVD) or improve colour vision for subjects with CVD. We examine briefly the scientific evidence that has to date been gathered to study the reliability of these aids. In the light of our experience working in this field, we reflect on several related issues : why this question has not been elucidated before, how a filter would have to be designed for a specific task, and the importance of developing a personalised colour space for subjects with CVD to gain some insight into the effect of aids. Note de contenu : - Why is it an open question - A personalised colorimetry for subjects with CVD - The ultimate filter solution ? What the perfect filter should do DOI : 10.1111/cote.12505 En ligne : https://onlinelibrary.wiley.com/doi/epdf/10.1111/cote.12505 Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=35590 [article]

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On the issue of linearity in chromatic induction by a uniform background / Edoardo Provenzi in COLORATION TECHNOLOGY, Vol. 137, N° 1 (02/2021)  

[article]  inCOLORATION TECHNOLOGY > Vol. 137, N° 1 (02/2021) . - p. 68-71 Titre : On the issue of linearity in chromatic induction by a uniform background Type de document : texte imprimé Auteurs : Edoardo Provenzi, Auteur Année de publication : 2021 Article en page(s) : p. 68-71 Note générale : Bibliogr. Langues : Anglais (eng) Index. décimale : 535.6 Couleur Résumé : In 1974, Resnikoff proposed a very elegant model for the space of perceived colours P based on differential geometry techniques. By adding to Schrödinger's axioms a further hypothesis of homogeneity for P, he managed to prove that P can only take two possible forms, one of which is the classical flat trichromatic space, and the other a negatively curved space. The latter has been ignored until recently, when it was used as the starting point for a promising new programme concerning the refoundation of colorimetry. A key step in Resnikoff's construction is the identification of a group of transformations that act transitively on P as so-called background transformations, that is, changes of the uniform context in which a colour stimulus is embedded. While their transitive nature poses no problem, to the best of the author's knowledge, the hypothesis that these transformations act linearly on the perceived colour associated with the stimulus has never been verified. In this paper, we highlight the importance of the linearity issue in chromatic induction and leave it as an open problem to be discussed by experts in colour, psycho-physics and vision science. Note de contenu : - RESNIKOFF'S MODEL - THE LINEARITY ISSUE - - Fig. 1 : In Resnikoff's model, a colour is always associated with a couple of elements given by a physical light stimulus, and the uniform background in which it is embedded - Fig. 2 : The inner disks appearing in the centre of the two images are exactly the same physical colour stimulus. However, the one on the left image is perceived, with respect to its background, as a very saturated green; however, after the change of background shown in the image on the right, the colour stimulus is perceived as yellowish - Fig. 3 : The effect of composing four background transformations to pass from a bright green to a perceived brown colour DOI : 10.1111/cote.12507 En ligne : https://onlinelibrary.wiley.com/doi/epdf/10.1111/cote.12507 Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=35591 [article]

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Machine colour constancy : a work in progress / Michela Lecca in COLORATION TECHNOLOGY, Vol. 137, N° 1 (02/2021)  

[article]  inCOLORATION TECHNOLOGY > Vol. 137, N° 1 (02/2021) . - p. 72-77 Titre : Machine colour constancy : a work in progress Type de document : texte imprimé Auteurs : Michela Lecca, Auteur Année de publication : 2021 Article en page(s) : p. 72-77 Note générale : Bibliogr. Langues : Anglais (eng) Index. décimale : 535.6 Couleur Résumé : The term "colour constancy" denotes the human capability to recognise an object as the same entity even if its colours change due to illumination. Implementing such a human capability is highly desirable in computer vision to retrieve, detect, recognise and track objects regardless of the illumination. Many efforts have been made in this direction, leading to several "machine colour constancy" (MCC) algorithms, that is, routines inspired by human colour constancy (HCC) that are aiming to achieve an image representation independent of the light and thus invariant against light changes. Different to HCC, which is subject to illusions and only partially removes illuminant effects, MCC pursues the implementation of a perfect, total removal of light effects from images. Such an implementation represents a major challenge and is therefore a focus of ongoing research. In fact, the currently available MCC algorithms only work under constrained domains. Therefore, a priori knowledge about the image content is needed to choose the most appropriate MCC procedure and to properly set its parameters. Here, we present the main common assumptions underlying most of MCC algorithms. Our work shows that two main issues should be addressed in the future to ensure MCC is more efficacious and useable : first, the lack of a reliable MCC algorithm operating without supervision in multiple scenarios ; and second, the difficulty which any user encounters when choosing the MCC procedure most appropriate for a particular application. Note de contenu : - Common assumptions in MCC and their limitations - Table 1 : Summary of common assumptions at the basis of machine colour constancy (MCC) algorithms DOI : 10.1111/cote.12490 En ligne : https://onlinelibrary.wiley.com/doi/epdf/10.1111/cote.12490 Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=35592 [article]

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Research directions in color movie restoration / Alice Plutino in COLORATION TECHNOLOGY, Vol. 137, N° 1 (02/2021)  

[article]  inCOLORATION TECHNOLOGY > Vol. 137, N° 1 (02/2021) . - p. 78-82 Titre : Research directions in color movie restoration Type de document : texte imprimé Auteurs : Alice Plutino, Auteur ; Alessandro Rizzi, Auteur Année de publication : 2021 Article en page(s) : p. 78-82 Note générale : Bibliogr. Langues : Anglais (eng) Index. décimale : 535.6 Couleur Résumé : Film restoration is a complex and multidisciplinary field that requires the collaboration of many professionals. Here, we present a series of ongoing unresolved problems, focusing on digitisation, digital restoration and conservation. Note de contenu : - Digitisation - Digital restoration - Conservation - Fig. 1 : A graphical representation of the film restoration workflow - Fig. 2 : An example of the original frame extracted from the original video "Fiat 508" (193X) and the restored digital copy. It is possible to notice that the video steady produced a cut (ie information loss) at the edges of the frames - Fig. 3 : An example of the original frame extracted from the original video "La strage di Piazza della Loggia: i funerali" (Brescia, 1974), the copy restored manually through video-editing software, and the copy restored through the automatic colour equalisation (ACE) algorithm DOI : 10.1111/cote.12488 En ligne : https://onlinelibrary.wiley.com/doi/epdf/10.1111/cote.12488 Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=35593 [article]

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Is CIELAB one space or many ? / Michael H. Brill in COLORATION TECHNOLOGY, Vol. 137, N° 1 (02/2021)  

[article]  inCOLORATION TECHNOLOGY > Vol. 137, N° 1 (02/2021) . - p. 83-85 Titre : Is CIELAB one space or many ? Type de document : texte imprimé Auteurs : Michael H. Brill, Auteur Année de publication : 2021 Article en page(s) : p. 83-85 Note générale : Bibliogr. Langues : Anglais (eng) Index. décimale : 535.6 Couleur Résumé : Models in colour engineering can have implicit customary usage, outside of whose parameters one is not supposed to venture. CIELAB is one such model : although able to accommodate a prediction of asymmetric matches, CIELAB is used in practice to compare colours only for a given illuminant/observer condition. Should we therefore deem CIELAB to be an infinity of spaces, one for each illuminant/observer combination ? This question has its roots in an oddity of CIELAB’s chromatic-adaptation model. A chromatic-adaptation oddity also entered CIE models that emerged after CIELAB, and leads to a similarly perplexing question. Note de contenu : - CIELAB : Customary use - CIELAB : Non-customary uses DOI : 10.1111/cote.12486 En ligne : https://onlinelibrary.wiley.com/doi/epdf/10.1111/cote.12486 Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=35594 [article]

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Printing the light / Carinna Parraman in COLORATION TECHNOLOGY, Vol. 137, N° 1 (02/2021)  

[article]  inCOLORATION TECHNOLOGY > Vol. 137, N° 1 (02/2021) . - p. 86-89 Titre : Printing the light Type de document : texte imprimé Auteurs : Carinna Parraman, Auteur ; Susanne Klein, Auteur Année de publication : 2021 Article en page(s) : p. 86-89 Note générale : Bibliogr. Langues : Anglais (eng) Index. décimale : 667.2 Colorants et pigments Résumé : This paper explores the relationship between additive and subtractive mixing for colour printing. Using Spectraval mica pigments (Merck)—marketed as RGB pigments—colour is generated by selective reflection and prints are based on additive colour mixing principles, that when printed onto black paper, create white and a range of colours. Although currently used mostly for decorative effects, they can be the basis of additive 'process' inks, that present new opportunities for and challenges to traditional print markets. The viewing angle dependency of their selective reflection favours applications in security printing similar to the holograms on bank cards for example. Traditional measurement and modelling methods are difficult to apply due to the layering and irregular dispersion of pigments. Note de contenu : - Introduction to the challenge - A brief history of additive colour mixing - How can we print the light with pigments ? - Open issues - Fig. 1 : Transmittance spectra of Lee Tricolour filters - Fig. 2 : Transmittance spectra of red, green and blue Spectraval pigments - Fig. 3 : Photograph of beetle directly above the print ; photograph taken at an angle DOI : 10.1111/cote.12523 En ligne : https://onlinelibrary.wiley.com/doi/epdf/10.1111/cote.12523 Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=35595 [article]

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22843	-	Périodique	Bibliothèque principale	Documentaires	Disponible