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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Colour management in digital textile printing / Dejana Javorsek in COLORATION TECHNOLOGY, Vol. 127, N° 4 (2011)

[article]  inCOLORATION TECHNOLOGY > Vol. 127, N° 4 (2011) . - p. 235--239 Titre : Colour management in digital textile printing Type de document : texte imprimé Auteurs : Dejana Javorsek, Auteur ; Andrej Javorsek, Auteur Année de publication : 2011 Article en page(s) : p. 235--239 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Colorimétrie Impression au laser Impression jet d'encre Impression numérique Impression sur étoffes Simulation, Méthode de Index. décimale : 667.3 Teinture et impression des tissus Résumé : On the basis of simulated prints, a customer can decide on the colour appropriateness for a selected pattern. This article presents the possibilities and correct procedure for colour management application in the field of digital printing onto a textile substrate. The aim of the research was to establish whether long-term and expensive pre- and after-treatments can be avoided with the help of an appropriate development of printer profiles. The latter would be conducted through a print simulation on paper printed with a Canon laser or ink-jet printer. The results have confirmed that a print simulation on paper can be conducted with both printers, while a Canon ink-jet printer offers better results. In addition, by calculating the colour inconstancy index CMCCON02, the illuminant influence on the colour change of substrates under five different illuminations was determined. The results showed that simulated colours should be compared with original colours under daylight illuminants (D50, D55 and D75), while indoor illuminants A and F2 are not appropriate for a comparison, especially in the case of simulation with a Canon ink-jet printer (CMCCON02 index >5). Note de contenu : EXPERIMENTAL : Material - Pretreatment of textile fabric - Linearisation and characterisation of printer devices - Colour samples - Printing process performed on the Mimaki ink-jet printer - Simulation of prints - Colour measurements - Calculation of the colour inconstancy index CMCCON02. RESULTS AND DISCUSSION : Colour inconstancy index - Simulation of prints. DOI : 10.1111/j.1478-4408.2011.00304.x Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=11903 [article]

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