Accueil
Catégories
Ajouter le résultat dans votre panier Affiner la recherche
Etendre la recherche sur niveau(x) vers le bas
Quantification and prediction of visually perceived specular gloss at three illumination/viewing geometries / Fereshteh Mirjalili in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 13, N° 2 (03/2016)
[article]
Titre : Quantification and prediction of visually perceived specular gloss at three illumination/viewing geometries Type de document : texte imprimé Auteurs : Fereshteh Mirjalili, Auteur ; Siamak Moradian, Auteur ; Farhad Ameri, Auteur ; Mohammad Amani Tehran, Auteur Année de publication : 2016 Article en page(s) : p. 239-256 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Brillance (optique)
Eclairage
Evaluation visuelle
Mesure
vision des couleursTags : 'Brillant spéculaire' 'Evaluation visuelle' 'Niveau de brillance achromatique' 'Eclairage unidirectionnel' 'Brillance mètre trois angles' Index. décimale : 667.9 Revêtements et enduits Résumé : In the present study, attempts were made to clarify the existence of a correlation between visually perceived and instrumentally measured specular gloss of a series of achromatic samples. To this end, seven achromatic physical scales of specular gloss each consisting of 10 or 11 samples were prepared using lithographically printed black, white, and five in between gray papers. The samples were visually assessed and subsequently quantified in terms of a visually uniform color constant lightness scale, by a panel of 14 observers in an especially designed unidirectional light compartment at three illumination/observation geometries, namely 20°/20°, 60°/60°, and 85°/85°. Four statistical parameters were utilized to determine the correlation between visually perceived and instrumentally measured specular gloss. The results show that the instrumental 60°/60° geometry is capable of efficiently quantifying the equivalent specular gloss as perceived by a human observer. Surprisingly, it was also possible to accurately predict the visually quantified specular gloss both at the 20° and the 85° geometries by the aid of applying special linear relationships derived from the instrumentally measured specular gloss of the 60° geometry. Note de contenu : - EXPERIMENTAL : Preparation of specular gloss scales - Instrumental characterization - Visual assessments
- RESULTS AND DISCUSSION : Correlation between visual results and instrumental measurementsDOI : 10.1007/s11998-015-9756-2 En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-015-9756-2.pdf Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=26109
in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 13, N° 2 (03/2016) . - p. 239-256[article]Réservation
Réserver ce document
Exemplaires (1)
Code-barres Cote Support Localisation Section Disponibilité 17962 - Périodique Bibliothèque principale Documentaires Disponible
[article]
Titre : Shades of difference : Visual and instrumental methods of colour assessment analysed Type de document : texte imprimé Auteurs : Werner Rudolf Cramer, Auteur Année de publication : 2018 Article en page(s) : p. 34-39 Langues : Anglais (eng) Catégories : Colorimétrie
Evaluation visuelle
Mesure -- Instruments
vision des couleursIndex. décimale : 667.9 Revêtements et enduits Résumé : Methods of assessing colour and colour differences visually and instrumentally are discussed and compared. Preferred methods of carrying out visual colour assessment are described and explanations are offered for why visual and instrumental assessments may sometimes seem to give conflicting results. Note de contenu : - Measurement angles and correlation problems
- An organised approach to visual matching
- The principle of reversibility - and some exceptions
- Instrumental assessment : geometrical considerations
- Angle-dependent behaviour of effect pigments
- Appearance of metallic and effect pigments compared
- Visual and instrumental aspects summarised
- Fig. 1 In this example of visual observation, the starting position at the window is + 15° for illumination and -15° for observation, i.e. the difference angle between illumination and observation is 30°C
- Fig. 2. Tilting the panel up, the angle of illumination increases and the aspecular (difference angle between observation and gloss) also increases
- Fig. 3. The observation angle increases when tilting the panel down. In the first steps the aspecular angle is negative, i.e. the observation angle is opposite to the gloss angle
- Fig. 4. Tilting the panel further down, the aspecular angle increases. The difference angle between illumination and observation remains the same
- Fig. 5. Tilting a panel up and down at a window produces the same colour travel
Fig. 6. When tilting a panel by the window, the highest lightness is observed near the gloss and will decrease when the panel is tilted away from this. The same or similar values occur due to principle of the reversibility of light ; deviations reveal the orientation of the effect pigments
- Fig. 7. A portable instrument illuminates at 45°. Measurement is made at -15°, +15°, 25°, 45°, 75° and 10° off gloss
- Fig. 8. If coloured transparent interference pigments are applied to a white background, the colour change from the reflection to the transmission colour is shown when measuring the gloss line. The transition range is between 20° and 30° from the gloss angle
- 9. Application also influences behaviour with regard to lightness. The same coating was applied with and without an additional effect layer. Close to the gloss, the effect layer produces a brighter shade
- 10. Tilting a sample panel at the window or in a light cabin shows the same colour gradient for both tilting down and tilting up. The colour gradient that current portable devices describe corresponds to the gradient when the gloss angle is changed. In all cases, different colour gradients arise from those of the interferenceEn ligne : https://drive.google.com/file/d/1TQwGB5nfx6DUSG2me8WmaEWhw62SxsnE/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=30494
in EUROPEAN COATINGS JOURNAL (ECJ) > N° 4 (04/2018) . - p. 34-39[article]Réservation
Réserver ce document
Exemplaires (1)
Code-barres Cote Support Localisation Section Disponibilité 19837 - Périodique Bibliothèque principale Documentaires Disponible Stratifiés décoratifs haute pression (HPL). Plaques à base de résines thermodurcissables (communément appelées stratifiés) - Partie 2 : Détermination des caractéristiques - Norme NF EN 438-2 / Association Française de Normalisation (Paris) / Saint-Denis La Plaine : Association Française de Normalisation (AFNOR) (2005)
Titre de série : Stratifiés décoratifs haute pression (HPL) Titre : Plaques à base de résines thermodurcissables (communément appelées stratifiés) - Partie 2 : Détermination des caractéristiques - Norme NF EN 438-2 Type de document : texte imprimé Auteurs : Association Française de Normalisation (Paris) , Auteur Editeur : Saint-Denis La Plaine : Association Française de Normalisation (AFNOR) Année de publication : 2005 Importance : 65 p. Présentation : ill. Format : 30 cm Note générale : Bibliogr. Langues : Français (fre) Catégories : Cloquage (défauts)
Essais de résilience
Evaluation visuelle
Mesure
Résistance à l'abrasion
Résistance à l'humidité:Résistance à l'eau
Résistance à la fissuration
Résistance au chocs
Résistance au craquelage
Résistance thermique
Revêtements décoratifs -- Normes
Solidité de la couleur
Stabilité dimensionnelle
Stratifiés -- Normes
Taches
ThermodurcissablesIndex. décimale : 668.4 Plastiques, vinyles Résumé : Le présent document spécifie les méthodes d'essai pour la détermination des caractéristiques des plaques de stratifiés décoratifs haute pression définies à l'Article 3. Ces méthodes sont principalement destinées pour la réalisation des essais sur les plaques spécifiées dans les EN 438-3, 4, et 6. Indice de classement : T 54.301-2 Classification ICS : 83.140.20 Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=30580 Réservation
Réserver ce document
Exemplaires (1)
Code-barres Cote Support Localisation Section Disponibilité 19894 T 54-301-2 Norme Bibliothèque principale Documentaires Disponible Studies on solubilized sulfur dyes for coloring leather / R. Venba in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CX, N° 6 (06/2015)
[article]
Titre : Studies on solubilized sulfur dyes for coloring leather Type de document : texte imprimé Auteurs : R. Venba, Auteur ; Malathy Jawahar, Auteur ; G. Jothi, Auteur ; D. Dakshinamoorthy, Auteur ; A. Deepika, Auteur ; Chandra Babu Narasimhan Kannan, Auteur ; K. N. Ramesh, Auteur Année de publication : 2015 Article en page(s) : p. 177-185 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Colorants
Cuirs et peaux -- Teinture
Evaluation visuelle
Solidité de la couleur
Solutions (chimie)
Soufre
Wet-blue (tannage)Peau tannée au chrome (le chrome donne une couleur bleue)Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : Cow wet blue stock was colored with solubilized sulfur dyes in a systematic study to unravel the color yield quality of dyeing and fastness of the dyes. These dyes penetrated the leather cross-section well and this performance resulted in a beneficial tone-in-tone dyeing, which means that the color of the grain, flesh and cross section of leather was almost the same tone. The levelness and uniformity of dyeing were excellent. Their fastness performance was generally very good. The resultant shades suggested that the sulfur dyes were best suited for light, pastel and medium shades, which require a high degree of levelness, penetration and fastness properties. An intense shade resulted from offering the sulfur dyes ahead of the retanning and fatliquoring process steps with a trivial reduction in penetration through the leather cross section for all the ten dyes studied. These findings favor the profitable production of light, medium to dark dye shades on leathers. Note de contenu : - MATERIALS AND METHODS : Materials - Methods - Leather application trials with sulfur dyes - Study on the fastness characteristics of the dyed leathers - Study on the effect of process parameters on color intensity
- RESULTS AND DISCUSSIONS : Study on the solution characteristics - Visual assessment of the dyeing characteristics of sulfur dyes - Fastness characteristics of full chrome cow leathers dyes with sulfur dye - Influence of process sequence variation on color strengthEn ligne : https://drive.google.com/file/d/1WYScwtMe3Km5iaxJPT9uO6xcuBYlAINi/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=24232
in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. CX, N° 6 (06/2015) . - p. 177-185[article]Réservation
Réserver ce document
Exemplaires (1)
Code-barres Cote Support Localisation Section Disponibilité 17260 - Périodique Bibliothèque principale Documentaires Disponible Study for skin gloss perception using computer modulation and frequency separation on surface reflection in INTERNATIONAL JOURNAL OF COSMETIC SCIENCE, Vol. 45, N° 4 (08/2023)
[article]
Titre : Study for skin gloss perception using computer modulation and frequency separation on surface reflection Type de document : texte imprimé Année de publication : 2023 Article en page(s) : p. 500-511 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Analyse d'image L'analyse d'image est la reconnaissance des éléments contenus dans l'image. Il ne faut pas confondre analyse (décomposition en éléments) et traitement (action sur les composantes) de l'image.
Analyse des données
Brillance (optique)
Clarté de la peau
Evaluation visuelle
Modèles numériques
Peau -- analyse
Peau -- Perception visuelle
Réflectance
StatistiquesIndex. décimale : 668.5 Parfums et cosmétiques Résumé : - Objective : Skin gloss is a parameter of beauty and health and is used to evaluate the efficacy of makeup or skin care products. Skin gloss is a perception-based characteristic, which yet needs to be evaluated quantitatively and objectively. This study aimed to investigate the factors affecting the perception of matte, glossiness and greasiness on Korean women's skin, focusing on the effect of surface reflection.
- Methods : In this study, a visual evaluation of skin gloss was performed using modulated images that combined facial reference (normal) images with images characterized by 64 different levels of surface reflection to investigate factors that might affect the perception of matte, glossy and greasy skin. Fifteen participants classified the respective images into three categories (matte, glossy and greasy), and the intensity of each image was rated using a three-point scale (weak, moderate or strong). A multinomial logistic regression analysis was performed using 960 data points (n = 64 × 15). A high-frequency average + 1 standard deviation (SD = 4) was set as the criterion for a highly glossy object.
- Results : A significant difference was found between the three categories considering four parameters: low-frequency mean (LFM) and SD (LFSD) and high-frequency mean (HFM) and SD (HFSD). The results of the multinomial logistic regression analysis showed that LFM and HFSD were significant influencing factors for perceiving matte, glossiness and greasiness. As the LFM and HFSD of the images increased, perception changed from matte, to glossy and greasy. Further, the total number and total area of highly glossy objects were significantly different among the three categories.
- Conclusion : We identified four different factors related to perceiving matte, glossiness and greasiness on the faces of Korean women, including the LFM and HFSD of surface reflection, as well as the number of highly glossy objects and the area of surface reflection. Furthermore, we identified evenness of shine as a key factor for the perception of greasiness. These parameters could be useful for distinguishing skin gloss and for a quantitative evaluation of greasiness.Note de contenu : - MATERIALS AND METHODS : Ethical considerations - Stimuli image preparation - Image analysis - Questionnaire assessment - Data analysis
- RESULTS : Raw low or high spatial frequency mean and SD of surface reflection - Comparison of LFM, LFSD, HFM and HFSD by categories - Prediction of skin gloss categories - Number and total area of highly glossy objects
- Table 1 : The characteristic description of applied products
- Table 2 : Mean and standard deviation of low- and high-frequency images
- Table 3 : Comparison of results among intensities of the categories
- Table 4 : Goodness-of-fit (Pearson chi-square p-value) and Nagelkerke's pseudo R2
- Table 5 : Results of the multinomial logistic regression analysis
- Table 6 : Results of the prediction of categories using the multinomial logistic regression
- Table 7 : Results of the multinomial logistic regression analysis of high-glossy objects (HG)DOI : https://doi.org/10.1111/ics.12859 En ligne : https://drive.google.com/file/d/1pSqV2VLvO8JldV45hw1dXEwrDk8up4at/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=39880
in INTERNATIONAL JOURNAL OF COSMETIC SCIENCE > Vol. 45, N° 4 (08/2023) . - p. 500-511[article]A study of quantifying the emotional quality applied to a materials analysis method for genuine automotive leather / Jeong Chan Ho in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 102, N° 3 (05-06/2018)
PermalinkSynthesis and application of urea paraformaldehyde polymer as a tanning agent / N. H. El-Sayed in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 86, N° 6 (11-12/2002)
PermalinkTextiles. Détermination de la propension des étoffes à l'ébouriffage en surface et au boulochage - Norme NF EN ISO 12945-1 / Association Française de Normalisation (Paris) / Saint-Denis La Plaine : Association Française de Normalisation (AFNOR) (2002)
PermalinkTextiles. Détermination de la propension des étoffes à l'ébouriffage en surface et au boulochage - Norme NF EN ISO 12945-1 / Association Française de Normalisation (Paris) / Saint-Denis La Plaine : Association Française de Normalisation (AFNOR) (2000)
PermalinkThe effect of surface preparation grades of weld seams on coating performance / Sang-Moon Shin in JOURNAL OF PROTECTIVE COATINGS & LININGS (JPCL), Vol. 35, N° 7 (07/2018)
PermalinkThe evaluation of DBD plasma technique for removing carbon stain from leather artifacts / Muhammad El-Qubaisy in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 102, N° 4 (07-08/2018)
PermalinkThe National Coil Coating Association’s Color Experiment : Potential for converting to CIE color space and deltaE 2000 / David A. Cocuzzi in COATINGS TECH, Vol. 16, N° 1 (01/2019)
PermalinkTowards 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)
PermalinkUse of ternary solvent (water - ethanol - ethyl acetate) medium for leather processing : a possible paradigm change / Bhargavi Narayana Reddy Gari in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CXI, N° 7 (07/2016)
PermalinkVisual sensibility evaluation of Korean traditional indigo-dyed lyocell fabrics / Eugene Lee in COLORATION TECHNOLOGY, Vol. 134, N° 4 (08/2018)
Permalink