Artificial neural networks for colour prediction in leather dyeing on the basis of a tristimulus system / Malathy Jawahar in COLORATION TECHNOLOGY, Vol. 131, N° 1 (02/2015)  

[article]  inCOLORATION TECHNOLOGY > Vol. 131, N° 1 (02/2015) . - p. 48-57 Titre : Artificial neural networks for colour prediction in leather dyeing on the basis of a tristimulus system Type de document : texte imprimé Auteurs : Malathy Jawahar, Auteur ; Chandra Babu Narasimhan Kannan, Auteur ; Mehta Kondamudi Manobhai, Auteur Année de publication : 2015 Article en page(s) : p. 48-57 Langues : Anglais (eng) Catégories : Couleur Couleur -- Analyse Echantillonnage Essais (technologie) Prévision, Théorie de la Qualité -- Contrôle Réseaux neuronaux (informatique) Teinture -- Fibres textiles Index. décimale : 667.3 Teinture et impression des tissus Résumé : Computer-assisted colour prediction and quality control have become increasingly important to the dyeing process in many consumer goods manufacturing industries, including textile and leather. The most challenging aspect concerns dye recipe prediction for the production of the required shade on a given substrate. Computer recipe prediction based on the conventional and widely used Kubelka–Munk model often fails under a variety of conditions. In the present investigation, an attempt has been made to develop an artificial neural network model to predict colour in terms of tristimulus values (X, Y, Z) given the concentration of dyes. An artificial neural network model was trained with 300 pairs of known input vectors, i.e. dye concentrations, and output vectors, i.e. colour parameters, using a backpropagation algorithm. The artificial neural network topology consists of three neurons in the input layer to represent the concentration of dyes, three neurons in the output layer to represent the tristimulus values X, Y, and Z, and five neurons in the hidden layer with a log-sigmoid transfer function. The artificial neural network results showed a good level of colour prediction during the training and testing phase. The results also indicate that the artificial neural network has the potential to give better predictive performance than the conventional Kubelka–Munk model. Note de contenu : - INTRODUCTION : Conventional colour prediction model (the Kubelka-Munk model) - Neural network and colour prediction - EXPERIMENTAL : Materials - Leather sample preparation - Colour analysis - Database generation for the Kubelka-Munk model - Artificial neural network design - RESULTS AND DISCUSSION : Conventional colour prediction using the Kubelka-Munk model - ANN design optimisation - Artificial neural network training - Validation of the Kubelka-Munk and artificial neural network models DOI : 10.1111/cote.12123 En ligne : https://onlinelibrary.wiley.com/doi/epdf/10.1111/cote.12123 Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=22983 [article]

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Assessing the performance of a spectral reflectance estimation method based on a diffraction grating and a spectroradiometer / Dejana Javorsek in COLORATION TECHNOLOGY, Vol. 130, N° 4 (08/2014)  

[article]  inCOLORATION TECHNOLOGY > Vol. 130, N° 4 (08/2014) . - p. 280-287 Titre : Assessing the performance of a spectral reflectance estimation method based on a diffraction grating and a spectroradiometer Type de document : texte imprimé Auteurs : Dejana Javorsek, Auteur ; Tim Jerman, Auteur ; Blaž Rat, Auteur ; AleÅ¡ Hladnik, Auteur Année de publication : 2014 Article en page(s) : p. 280-287 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Couleur -- Analyse Spectroscopie de réflectance Index. décimale : 667.3 Teinture et impression des tissus Résumé : Constant improvements in digital cameras have made it possible to use these devices for colour acquisition and reproduction at an advanced level. It is known that a colour match for all observers when changing illumination can only be achieved by matching spectral data. Obtaining spectral data from digital camera RGB values could provide a new way of using the digital camera as a spectrophotometric tool or as a high-quality colour-capturing system that is required in more demanding applications. In the present study, two spectral reflectance estimation methods were examined – the Imai–Berns method (ImaiBerns) and the spectral-sensitivity-based method (SpecSens). The purpose of the research was to simplify the procedure of the SpecSens method by using a diffraction grating and a spectroradiometer instead of a monochromator, and to compare the results with those of the ImaiBerns approach. Obtained spectral reflectance estimates were evaluated using the root-mean-square error and ?E00 metrics. Results of the research show that the ImaiBerns method was superior to SpecSens, most likely because the former method does not require knowledge of the camera spectral sensitivities, which often introduces errors into reflectance estimation calculations. Both methods were successful in predicting black, brownish, and dark patches, as indicated by a low root-mean-square error, as well as unsaturated pastel, pink, or skin colours, which produced low ?E00 values. On the other hand, many of the patches with a low root-mean-square error also exhibited high ?E00 values, while bright, nearly-white patches were characterised by a high root-mean-square error. DOI : 10.1111/cote.12095 En ligne : https://onlinelibrary.wiley.com/doi/epdf/10.1111/cote.12095 Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=21781 [article]

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Causes of colouring in iron oxide pigments / Jürgen Köhler in POLYMERS PAINT COLOUR JOURNAL - PPCJ, Vol. 204, N° 4601 (10/2014)  

[article]  inPOLYMERS PAINT COLOUR JOURNAL - PPCJ > Vol. 204, N° 4601 (10/2014) . - p. 14-18 Titre : Causes of colouring in iron oxide pigments Type de document : texte imprimé Auteurs : Jürgen Köhler, Auteur ; Volker Schneider, Auteur ; Jürgen Kischkewitz, Auteur Année de publication : 2014 Article en page(s) : p. 14-18 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Caractérisation Couleur -- Analyse Oxyde de fer Pigments métalliques Spectroscopie d'absorption Index. décimale : 667.2 Colorants et pigments Résumé : With an annual consumption of around one million metric tons, synthetic iron oxides are the most important group of inorganic colour pigments. Although these products have already been used very successfully to colour a wide range of materials for many years, their colouring mechanism (causes of colouring) has not been described sufficiently to date. In the case of inorganic pigments, colouring is commonly produced by a combination of light absorption and diffusion in the visible spectral range. This publication offers a detailed description of colouring for red, yellow, orange and black iron oxides. It is explained using structural features of the respective iron oxides and findings from ligand field and molecular orbital theory (MO theory). The tests performed were carried out on phase-pure iron oxide pigments that are grouped together with selected properties in Table 1. Note de contenu : - TESTS ON IRON OXIDE RED PIGMENTS : 1. Characterisation of the pigments - 2. Structural features of the hematite lattice - 3. Light absorption and colouring - TESTS ON IRON OXIDE YELLOW PIGMENTS : 1. Characterisation of products - 2. Structural features of the goethite lattice - 3. Absorption spectrum and colouring - TESTS ON THE IRON OXIDE ORANGE PIGMENT : 1. Characterisation and structural features - 2. Light absorption and colouring - CAUSES OF COLOURING IN IRON OXIDE BLACK PIGMENTS En ligne : https://drive.google.com/file/d/16NTEfvX8TmSS4HyCB0B3qYt6syf3r7rQ/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=22139 [article]

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Color in business, science and industry / Deane B. Judd / New York [Etats-Unis] : John Wiley & Sons (1975)

Titre : Color in business, science and industry Type de document : texte imprimé Auteurs : Deane B. Judd, Auteur ; Günter Wyszecki, Auteur Mention d'édition : Third edition Editeur : New York [Etats-Unis] : John Wiley & Sons Année de publication : 1975 Collection : Wiley series in pure and applied optics Importance : XIII-553 p. Présentation : ill. Format : 23 cm ISBN/ISSN/EAN : 0-471-45212-2 Note générale : Index - Bibliogr. Langues : Américain (ame) Catégories : Colorimétrie Couleur Couleur -- Analyse vision des couleurs Index. décimale : 535.6 Couleur Résumé : 1. BASIC FACTS : The eye - Fundamental aspects of color - Color matching / 2. TOOLS AND TECHNICS : Spectrometry - Fundamental standards in colorimetry - Colorimeters - Colorimetry by difference - Colorimetry of fluorescent materials - Reproduction of pictures in color - Color standards - Uniform color scales - Dark and light adaptation - chromatic adaptation - Color rendering of light sources - Object-color perception in complicated scenes - Color languages - Color harmony / 3. PHYSICS AND PSYCHOPHYSICS OF COLORANT LAYERS : Gloss - Opacity or hiding power - Kubelka-munk analysis - Colorant formulation. Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=2261

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Colour chart / Peter Köhler in EUROPEAN COATINGS JOURNAL (ECJ), N° 1 (01/2014)  

[article]  inEUROPEAN COATINGS JOURNAL (ECJ) > N° 1 (01/2014) . - p. 24-28 Titre : Colour chart : Establishing the causes of colouring in iron oxide pigments Type de document : texte imprimé Auteurs : Peter Köhler, Auteur ; Jürgen Kischkewitz, Auteur Année de publication : 2014 Article en page(s) : p. 24-28 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Couleur -- Analyse Ligands Lumière -- Absorption Orbitales moléculaires Oxyde de fer Pigments métalliques Spectres d'absorption vision des couleurs Index. décimale : 667.9 Revêtements et enduits Résumé : Synthetic iron oxides are an important group of inorganic colour pigments, with annual consumption around one million metric tonnes. But even though these products have been used extensively their colouring mechanism (causes of colouring) has not been described sufficiently to date. Detailed descriptions of colouring for red, yellow, orange and black iron oxides is provided and explained, using structural features of each and findings from ligand field and molecular orbital (MO) theory. Note de contenu : - Iron oxide red pigments - Light absorption and colouring - Iron oxide yellow pigments - Absorption spectrum and colouring - Iron oxide orange pigment - Light absorption and colouring - Causes of colouring in iron black pigments En ligne : https://drive.google.com/file/d/13nzvt26qRSpWr8GJvEYEfAKGnCaI_a44/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=20150 [article]

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Colour perfect / Matthew Russell in POLYMERS PAINT COLOUR JOURNAL - PPCJ, Vol. 196, N° 4502 (07/2006)

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Colour physics and colour measurement : state-of-the-art and challenges / Stephen Westland in SURFACE COATINGS INTERNATIONAL, Vol. 96, 2 (04/2013)  

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Colour prediction in wet state - an useful tool for batch correction / Priyanka Dutta in PAINTINDIA, Vol. LXIX, N° 8 (08/2019)  

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Colour science analytical at the University of Leeds / Algy Kazlauciunas in SURFACE COATINGS INTERNATIONAL, Vol. 95, 6 (12/2012)  

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Colour space conversion model from CMYK to CIELab based on CS-WNN / Zebin Su in COLORATION TECHNOLOGY, Vol. 137, N° 3 (06/2021)  

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Communiquer par la couleur / Paris : Editions 3C Conseil (1994)

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Compréhension des mécanismes de coloration des liants protéiques picturaux à l’aide du Noir Amide 10B / Carole Mathe in L'ACTUALITE CHIMIQUE, N° 7 (07/2002)  

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Correlation of visual and instrumental color measurements to establish color tolerance using regression analysis / Malathy Jawahar in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CX, N° 12 (12/2015)  

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De la couleur... à la colorimétrie / Alain Chrisment / Paris : Editions 3C Conseil (1994) 

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Couleur & colorimétrie / Alain Chrisment / Paris : Editions 3C Conseil (1994)

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Couleur - Colorimétrie. Espaces colorimétriques pseudo-uniformes : CIELUV et CIELAB - Norme NF X 08-014 / Association Française de Normalisation (Paris) / Saint-Denis La Plaine : Association Française de Normalisation (AFNOR) (1998)

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La couleur / Harald Küppers / Fribourg [Suisse] : Office du Livre (1975)

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Couleurs, apparences et effets spéciaux / Association Française des Techniciens des Peintures, Vernis, Encres et Adhésifs / Paris : AFTPVA (2002)

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A diverse color-tunable luminous polyurethane leather coating based on long persistent phosphors and photochromic spiropyrans / Saiqi Tian in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CXIV, N° 4 (04/2019)  

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Eliminating material dependency in spectra measurement via non-neighbouring band regression / Hui-Liang Shen in COLORATION TECHNOLOGY, Vol. 132, N° 2 (04/2016)  

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