Color prediction of metallic coatings from measurements at common geometries in portable multiangle spectrophotometers / Feng Heng in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 15, N° 5 (09/2018)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 15, N° 5 (09/2018) . - p. 957-966 Titre : Color prediction of metallic coatings from measurements at common geometries in portable multiangle spectrophotometers Type de document : texte imprimé Auteurs : Feng Heng, Auteur ; Haisong Xu, Auteur ; Fuzheng Zhang ; Zhehong Wang Année de publication : 2018 Article en page(s) : p. 957-966 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Essais (technologie) Prévision, Théorie de la Revêtement métallique Spectrophotomètres vision des couleurs Index. décimale : 667.9 Revêtements et enduits Résumé : Illuminating and viewing geometries may strongly affect the color appearance of metallic coatings, which can be characterized accurately by bidirectional reflectance distribution function (BRDF) measurement devices. However, such devices with hundreds or even thousands of different geometries are usually expensive and complex. Accordingly, two modified models were developed in this study, based on the distribution of aluminum-flake pigments in the coatings, to, respectively, estimate the spectral radiance factors and the CIE tristimulus values of metallic coatings utilizing the measurements at 6 common geometries of portable multiangle spectrophotometers. Their performance was examined with 65 achromatic and 20 chromatic metallic coating samples under D65, A, and F11 illuminants. The average CIEDE2000 color differences over all 19 geometries were found to be less than 1.8 for both models, while the average CAM02-SCD and CIELAB color differences can, respectively, reach 1.7 and 2.0, indicating the effectiveness of our methods. Note de contenu : - SAMPLE PREPARATION AND MEASUREMENT GEOMETRIES : Sample preparation - Measurement geometries of X-Rite MA98 - COLOR PREDICTION : Modelig spectral radiance factor - Modeling tristimulus values - MODEL TESTING DOI : 10.1007/s11998-017-0026-3 En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-017-0026-3.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=31120 [article]

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Towards a practical metric of surface gloss for metallic coatings from automotive industry / Mengting Wu in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 13, N° 3 (05/2016)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 13, N° 3 (05/2016) . - p. 469-477 Titre : Towards a practical metric of surface gloss for metallic coatings from automotive industry Type de document : texte imprimé Auteurs : Mengting Wu, Auteur ; Haisong Xu, Auteur ; Zhehong Wang, Auteur ; Haifeng Li, Auteur Année de publication : 2016 Article en page(s) : p. 469-477 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Automobiles -- Carrosseries Brillance (optique) Evaluation visuelle Mesure Revêtement métallique Index. décimale : 667.9 Revêtements et enduits Résumé : The specular gloss of metallic coatings from the automotive industry can be well measured by current glossmeters when the geometry is appropriately chosen from 20°, 60°, and 85° based on the gloss levels observed. However, the measurements are discontinuous and even nonmonotonic at the breakpoints dividing samples into different gloss levels in the whole range, which causes confusion and inconvenience for industry applications. In this study, attempts were made to link the measurements at the three geometries to be continuous monotonically and in the meanwhile to improve the accuracy of estimating visual gloss. A psychophysical experiment based on a magnitude method was carried out to assess the gloss of metallic coatings with different colors and textures. The visually scaled gloss data were compared with spectrophotometric measurements and instrumental specular gloss values under different geometries. With different weighing coefficients for measurements at individual geometries depending on the gloss levels, a model was proposed to describe the visual surface gloss of metallic coatings comprehensively via a practical metric based on the geometry-dependent measurements. In this way, each sample would have a unique overall gloss value highly correlated with its perceptual evaluation over the entire gloss range. Note de contenu : - EXPERIMENTS : Samples - Gloss measurements - Visual assessments - RESULTS AND DISCUSSION : Observer variability - Correlation between visual assessments and instrumental measurements - A MODEL OF VISUAL GLOSS DOI : 10.1007/s11998-015-9771-3 En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-015-9771-3.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=26287 [article]

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