Application of digital image analyses to measure print quality / William Lim in JOURNAL OF COATINGS TECHNOLOGY (JCT), Vol. 71, N° 894 (07/1999)

[article]  inJOURNAL OF COATINGS TECHNOLOGY (JCT) > Vol. 71, N° 894 (07/1999) . - p. 73-78 Titre : Application of digital image analyses to measure print quality Type de document : texte imprimé Auteurs : William Lim, Auteur ; Suresh Mani, Auteur Année de publication : 1999 Article en page(s) : p. 73-78 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Analyse qualitative (chimie) Etalonnage Imagerie numérique Impression numérique Lecteurs optiques Mesure -- Instruments Index. décimale : 667.4 Encres Résumé : The digital image analyses method is capable of objective and reproducible measurements of print mottle. The results of the scanner calibration test show improved consistency in the mottle values between different scanners. This would allow many locations to have their own analysis station without compromising a "universal" measurement. The mottle measurements of the Heidelberg standards correspond to the visual ranking. The robustness of the scanner method was shown by tests of prints on different substrates. Finally, a modified version of the analysis shows that halftone prints can also be tested. The method described here shows good agreement with the Tobias mottle tester. Note de contenu : - Mottle measurement - EXPERIMENTAL : Calibration tests for universal measurements - RESULTS : Scanner-to-scanner consistency - Effect of the calibration on consistency of a single scanner - DISCUSSION : Heidelberg standards measured - Cryovac poultry films measured - Rohm and Haas halftone prints Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=17916 [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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Colour stability during production of printed ocular prostheses / Ethan Bunker in COLORATION TECHNOLOGY, Vol. 139, N° 5 (10/2023)  

[article]  inCOLORATION TECHNOLOGY > Vol. 139, N° 5 (10/2023) . - p. 596-609 Titre : Colour stability during production of printed ocular prostheses Type de document : texte imprimé Auteurs : Ethan Bunker, Auteur ; Algy Kazlauciunas, Auteur ; Thimothy Zoltie, Auteur ; Emma Walshaw, Auteur ; Paul Bartlett, Auteur ; Tom Archer, Auteur ; Taras Gout, Auteur Année de publication : 2023 Article en page(s) : p. 596-609 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Analyse de variance En statistique, l'analyse de la variance (terme souvent abrégé par le terme anglais ANOVA : ANalysis Of VAriance) est un ensemble de modèles statistiques utilisés pour vérifier si les moyennes des groupes proviennent d'une même population. Les groupes correspondent aux modalités d'une variable qualitative (p. ex. variable : traitement; modalités : programme d'entrainement sportif, suppléments alimentaires ; placebo) et les moyennes sont calculés à partir d'une variable continue (p. ex. gain musculaire). Ce test s'applique lorsque l'on mesure une ou plusieurs variables explicatives catégorielles (appelées alors facteurs de variabilité, leurs différentes modalités étant parfois appelées "niveaux") qui ont de l'influence sur la loi d'une variable continue à expliquer. On parle d'analyse à un facteur lorsque l'analyse porte sur un modèle décrit par un seul facteur de variabilité, d'analyse à deux facteurs ou d'analyse multifactorielle sinon. (Wikipedia) Colorimétrie Couleurs -- Stabilité Impression numérique Polyacryliques Prothèses oculaires Statistiques Index. décimale : 535.6 Couleur Résumé : Ocular prostheses have been used for centuries to restore patient confidence, psychosocial relationships and to improve quality of life. Methodology for producing accurate prostheses has improved with technological discoveries. Recently, hand painting ocular prostheses has been the go-to method for creating life like prostheses. However, digital printing a print to envelope around an acrylic prosthesis has been shown to decrease treatment and rehabilitation times, whilst still producing high-definition ocular prostheses. Despite these improvements, little is known about the colour stability of digitally printed ocular prostheses. To better understand the colour stability of digital prostheses 30 samples simulating ocular prostheses were created, containing 10 with blue iris, 10 combination/green iris and 10 with sepia (brown) irises. Colour measurements were taken using a data spectrophotometer, from two defined points, the iris and sclera for both pre-polymerisation and post-polymerisation to assess colour variance. Colour coordinate data was gathered and was analysed using a one-way analysis of variance test and a paired t-test, both with alpha = 0.05. Significant colour variations were found for each iris colour and for the sclera. The sclera showed the largest colour variation with a ΔE of 4.75, followed by the brown irises, the green irises and then blue irises with ΔE values of 3.29, 2.47 and 1.82, respectively. This is a significant decrease compared to current hand painting methods which have an average colour variance of ΔE = 20. This shows a large increase in colour stability which can drastically improve patient satisfaction and quality of life. Note de contenu : - INTRODUCTION : History of ocular prostheses - Hand-painted acrylic ocular prostheses (HPAOP) - Digitally-printed acrylic ocular prostheses (DPAOP) - Production of acrylic ocular prostheses - RESEARCH OBJECTIVES - SCOPE OF STUDY - PROCEDURES : Participants - Simulated ocular prosthesis synthesis - Colour measurement procedure - Statistical analysis - RESULTS AND DISCUSSION : Reflectance data - Grayscale - Colour analysis-CIELab - Paired t-test analysis - Literature comparison - ANOVA - Table 1 : Grayscale mean ratings given for the sclera, brown iris, green iris and blue iris. These ratings are means across all prostheses - Table 2 : Table showing mean CIELab colour coordinates for each iris colour and the mean sclera - Table 3 : The t stat values for the paired t-test used to determine statistical significance pre-polymerisation and post-polymerisation - Table 4 : The total colour difference for each iris colour and the sclera. The data is expressed as the mean (standard deviation) - Table 5 : The ANOVA test results DOI : https://doi.org/10.1111/cote.12674 En ligne : https://onlinelibrary.wiley.com/doi/epdf/10.1111/cote.12674 Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=39838 [article]

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Comparative study of different methods for the assessment of print nonuniformity and their correlation with the human visual system / Ivana Juric in COLORATION TECHNOLOGY, Vol. 140, N° 2 (04/2024)  

[article]  inCOLORATION TECHNOLOGY > Vol. 140, N° 2 (04/2024) . - p. 239-251 Titre : Comparative study of different methods for the assessment of print nonuniformity and their correlation with the human visual system Type de document : texte imprimé Auteurs : Ivana Juric, Auteur ; Suncica Zdravkovic, Auteur ; Nemanja Kasikovic, Auteur ; Sandra Dedijer, Auteur ; Magdolna Pal, Auteur ; Zivko Pavlovic, Auteur ; Igor Karlovits, Auteur Année de publication : 2024 Article en page(s) : p. 239-251 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Détection de défauts (Ingénierie) Etudes comparatives Evaluation Evaluation visuelle Impression numérique Marbrures (défauts) Taches (défauts) Index. décimale : 667.3 Teinture et impression des tissus Résumé : Print non-uniformity is the variation of optical density (reflection) on the print and can occur in several different types that can be classified into two basic groups: random and systematic variations. This article examines two types from each group of variations that are most commonly found in digital printing systems: blotches and streaks, where amplitude and size were varied. Three most commonly used methods for measuring the print nonuniformity were used: Grey Level Co-occurrence Matrix (GLCM), ISO 13660 and Integration (also Improved Integration) method. The results obtained by measuring were compared with a visual assessment to find the link between objective and subjective analysis and to define and determine which method/parameter is the best for the measurement of which type of print (non)uniformity. The obtained results indicate the possibility of selecting the measurement parameter, but that the choice of the parameter depends on the type of nonuniformity. It is concluded that in the case of the GLCM method, the entropy and energy parameters are strongly related to the visual assessment for all three sets of samples. These parameters can be used regardless of the type of nonuniformity. The ISO G parameter can be used to measure both graininess and mottling, while the ISO M parameter is only suitable for measuring mottling. Integration method could be used to measure systematic error. On the basis of conclusions of the research, it is possible to propose the development of an industrially applicable solution for measuring print nonuniformity of digitally printed samples. Note de contenu : - INTRODUCTION : Methods for quantification and analysis of print nonuniformity - Field size for the analysis of print nonuniformity - MATERIALS AND METHODS : Sample creation - Image acquisition - Objective methods - Visual assessment - RESULTS AND DISCUSSION : Correlation between objective methods and visual assessment DOI : https://doi.org/10.1111/cote.12708 En ligne : https://drive.google.com/file/d/1u6Yhltf8474GtNOGVhD_aJL_WHtIhLry/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=40940 [article]

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Comparison of chromatic adaptation transforms used in textile printing sample preparation / Dejana Dordevic in COLORATION TECHNOLOGY, Vol. 126, N° 5 (2011)  

[article]  inCOLORATION TECHNOLOGY > Vol. 126, N° 5 (2011) . - p. 275-281 Titre : Comparison of chromatic adaptation transforms used in textile printing sample preparation Type de document : texte imprimé Auteurs : Dejana Dordevic, Auteur ; Andrej Javorsek, Auteur ; AleÅ¡ Hladnik, Auteur Année de publication : 2011 Article en page(s) : p. 275-281 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Analyse spectrale Colorants Impression numérique Impression sur étoffes Textiles et tissus imprimés vision des couleurs Index. décimale : 667.3 Teinture et impression des tissus Résumé : As image-capturing devices, such as scanners or digital cameras, normally describe data in RGB colour space, it is impossible to get a complete raw spectral description of a sample’s colour. Device characterisation enables conversion of RGB values to corresponding XYZ tristimulus values of a sample. For transformation of tristimulus values from one illuminant to another, chromatic adaptation transforms should be used. Within our research, chromatic adaptation transforms were implemented in the field of digital textile printing of textile substrate with reactive dyes. Five chromatic adaptation transforms were investigated and their performance was assessed with cluster analysis. Results showed that the lowest mean colour differences were generated with the D50-D65 illuminant pair, followed by D50-A and D65-A. The same performance ranking of different chromatic adaptation transforms was obtained for both D50-A and D65-A illuminant pairs. The Bradford method showed the best results irrespective of the examined illuminant pair combination. DOI : 10.1111/j.1478-4408.2010.00258.x En ligne : http://onlinelibrary.wiley.com/doi/10.1111/j.1478-4408.2010.00258.x/pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=10891 [article]

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Deinking of indigo prints using high-intensity ultrasound / A. Fricker in SURFACE COATINGS INTERNATIONAL. PART B : COATINGS TRANSACTIONS, Vol. 89, B2 (06/2006)  

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Developments for UV LED curing / Stacy Hoge in POLYMERS PAINT COLOUR JOURNAL - PPCJ, Vol. 204, N° 4602 (11/2014)  

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Digital and conventional printing and dyeing with the natural dye annatto: optimisation and standardisation processes to meet future demands / Georgios Savvidis in COLORATION TECHNOLOGY, Vol. 129, N° 1 (02/2013)  

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Digital camouflage printing / Tony Naschberger in TECHNICAL TEXTILES, Vol. 67, N° 1 (2023)  

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Digital ink-jet printing of regenerated cellulose nanofibrous mats with reactive inks / Asifa Sattar in COLORATION TECHNOLOGY, Vol. 140, N° 2 (04/2024)  

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Digital printing on leather / Karl Flowers in INTERNATIONAL LEATHER MAKER (ILM), N° 66 (07-08/2024)  

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Fixation des colorants jet d'encre / Pierre Viallier in L'INDUSTRIE TEXTILE, N° 1331 (05/2001)

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From analogue to digital / Inga Bargende in EUROPEAN COATINGS JOURNAL (ECJ), N° 2 (02/2022)  

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L'impression numérique gagne du terrain / Eglantine Maugard in CAOUTCHOUCS & PLASTIQUES, N° 791 (12/2000)

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Ink-jet printing of cotton with natural dyes / Georgios Savvidis in COLORATION TECHNOLOGY, Vol. 130, N° 3 (06/2014)  

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Inkjet technology for digital fabrication / Ian M. Hutchings / London [United Kingdom] : John Wiley & Sons (2013)

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Jet d'encre / Pascal Allender in L'INDUSTRIE TEXTILE, N° 1339 (03/2002)  

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Jet d'encre / Bruno Sueur in L'INDUSTRIE TEXTILE, N° 1331 (05/2001)

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Jet d'encre / Bruno Sueur in L'INDUSTRIE TEXTILE, N° 1339 (03/2002)  

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Jet d'encre / Bruno Sueur in L'INDUSTRIE TEXTILE, N° 1358 (01-02/2004)  

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