Evaluation of the CIE colour rendering index / Cheng Li in COLORATION TECHNOLOGY, Vol. 127, N° 2 (2011)  

[article]  inCOLORATION TECHNOLOGY > Vol. 127, N° 2 (2011) . - p. 129-135 Titre : Evaluation of the CIE colour rendering index Type de document : texte imprimé Auteurs : Cheng Li, Auteur ; Ming Ronnier Luo, Auteur ; Guihua Cui, Auteur ; Changjun Li, Auteur Année de publication : 2011 Article en page(s) : p. 129-135 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Colorimétrie Diodes électroluminescentes Sources de lumière vision des couleurs Index. décimale : 535.6 Couleur Résumé : An experiment was carried out to evaluate the change of colour appearance of samples under a reference illuminant and four light-emitting diode light sources. The results were used to evaluate the present CIE colour rendering index and other calculation methods. It was found that the present colour rendering index did not predict the visual data accurately. An index based on CAM02-UCS embedded with a reliable chromatic adaptation transform and a uniform colour space gave the best performance. Note de contenu : EXPERIMENTAL : Testing light sources - Testing samples - Viewing conditions - Data analysis RESULTS : Observer variability - The models' performances DOI : 10.1111/j.1478-4408.2011.00287.x En ligne : http://onlinelibrary.wiley.com/doi/10.1111/j.1478-4408.2011.00287.x/pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=12227 [article]

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Revisiting the weighting function for lightness in the CIEDE2000 colour-difference formula / Manuel Melgosa in COLORATION TECHNOLOGY, Vol. 133, N° 4 (08/2017)  

[article]  inCOLORATION TECHNOLOGY > Vol. 133, N° 4 (08/2017) . - p. 274-282 Titre : Revisiting the weighting function for lightness in the CIEDE2000 colour-difference formula Type de document : texte imprimé Auteurs : Manuel Melgosa, Auteur ; Guihua Cui, Auteur ; Claudio Oleari, Auteur ; Pedro J. Pardo, Auteur ; Min Huang, Auteur ; Changjun Li, Auteur ; Ming Ronnier Luo, Auteur Année de publication : 2017 Article en page(s) : p. 274-282 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Colorimétrie Fonction de pondération Index. décimale : 535.6 Couleur Résumé : We have used 13 experimental datasets (7420 colour pairs) to study the performance of the weighting function for lightness proposed by the CIEDE2000 colour-difference formula, because it has been suggested that this function can be improved by using the weighting function for lightness SL = 1 adopted by the CIE94 colour-difference formula. Using the standardised residual sum of squares (STRESS) index, it was found that: (i) replacing the SL in CIEDE2000 with SL = 1 improved the results for 7/13 datasets considered, but the improvement was statistically significant only for 1/13 datasets; (ii) a Whittle-type lightness-difference formula can be used to replace the term ?L*/SL in CIEDE2000, which led to a new colour-difference formula with no statistically significant difference with respect to CIEDE2000 for any of the 13 experimental datasets. A modification of the CIEDE2000 formula using a Whittle-type lightness formula is proposed. Note de contenu : - Influence of the four constants in the Sl function of CIEDE2000 - Replacement of ?L*/SL by a new lightness function based on the whittle formula - STRESS results using CIEDE2000 and two CIEDE2000-modified formulas DOI : 10.1111/cote.12294 En ligne : https://drive.google.com/file/d/1mNNKRQVoKWPADqH4d1JgEsji7TJE6dy2/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=28879 [article]

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The impact of viewing conditions on observer variability for cross-media colour reproduction / Yoon Ji Cho in COLORATION TECHNOLOGY, Vol. 135, N° 3 (06/2019)  

[article]  inCOLORATION TECHNOLOGY > Vol. 135, N° 3 (06/2019) . - p. 234-243 Titre : The impact of viewing conditions on observer variability for cross-media colour reproduction Type de document : texte imprimé Auteurs : Yoon Ji Cho, Auteur ; Guihua Cui, Auteur ; Ronnier Luo, Auteur ; Kwanghoon Sohn, Auteur Année de publication : 2019 Article en page(s) : p. 234-243 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Colorimétrie Métamérisme vision des couleurs Index. décimale : 667.3 Teinture et impression des tissus Résumé : This study investigates observer metamerism in cross-media colour reproduction (CMCR) between monitor and physical colours. An LCD display was placed inside a viewing cabinet. The cabinet had a mid-grey interior. Observers were asked to match a colour displayed on the monitor to a printed colour patch, which was also inside the viewing cabinet in two configurations, one consisting of two samples separated by a hairline gap (Configuration 1), and the other consisting of two samples separated by a large gap (Configuration 2). Eleven observers were asked to first match the background colour and then 10 test colours for each configuration, and this was repeated five times. The observers' variability results showed little difference between inter- and intra-variability, and between the two configurations. Comparing the observers' results with the CIE 1964 standard colorimetric observer, Configuration 1 and Configuration 2 each showed similar agreement. In both configurations, the results of observer variability were smaller than those obtained by Oicherman et al. in 2008. In addition, each configuration's results showed better agreement with the CIE standard colorimetric observer than Oicherman et al.'s results. This implies that both configurations, one with two samples having a hairline gap and with two samples separated by a large gap in a viewing cabinet, could be recommended for future CMCR systems. However, if choosing between the two, then Configuration 2 is recommended rather than Configuration 1. Note de contenu : - EXPERIMENTAL : Viewing cabinet - Monitor - Test stimuli - Experimental set-up - RESULTS AND DISCUSSION : Comparing with different configurations - Agreement with the CIE 1964 standard colorimetric observer - Comparing Oicherman et al.'s result to this study's results DOI : 10.1111/cote.12395 En ligne : https://onlinelibrary.wiley.com/doi/epdf/10.1111/cote.12395 Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=32615 [article]

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