| Titre : |
The National Coil Coating Association’s Color Experiment : Potential for converting to CIE color space and deltaE 2000 |
| Type de document : |
texte imprimé |
| Auteurs : |
David A. Cocuzzi, Auteur |
| Année de publication : |
2019 |
| Article en page(s) : |
p. 28-38 |
| Langues : |
Américain (ame) |
| Catégories : |
Analyse des données
Coil coatings
Colorimétrie
Evaluation visuelle
|
| Index. décimale : |
667.9 Revêtements et enduits |
| Résumé : |
Over the decades, the North American coil coating industry has depended on the use of Hunter color space to measure and control color. The National Coil Coating Association (NCCA), now in its 57th year, recognizes that many others are using CIE* color space for day-to-day color control, and that ΔE 2000 is considered a superior methodology to describe color difference, rather than ΔE Hunter. After using Hunter color space for nearly 60 years and relying on the opponent-color-theory coordinates ΔL, Δa, and Δb for color control and ΔE Hunter to define exterior weathering performance, one can assume that the current methodology is suitable, otherwise color issues would abound. But what if using CIE color space and ΔE 2000 is a better approach ? This article discusses the experiment that NCCA ran to evaluate the potential advantages of CIE color space and ΔE 2000. |
| Note de contenu : |
- EXPERIMENT : WARRANTY CONSIDERATIONS AND COLOR CONTROL : Warranty considerations - Color control along the prepainted metal value chain
- DATA ANALYSIS : Comparison of each observer's score vs the average score of the group - Evaluation of each observer's level of repeatability - Evaluation of the scores given to the identical pairs of panels - Determination of the group's average rating of each panel, and representation of these average values plotted against ΔE 2000 and ΔE hunter
- Fig. 1 : Comparison of ΔE 2000 vs ΔE hunter for weathered coil coated metal
- Fig. 2 : Comparison of ΔE 2000 vs ΔE hunter for weathered coil coated metal, highlighting saturated orange and red panels
- Fig. 3 : Observer's evaluation ratings vs the group's ratings
- Fig. 4 : Repeatability analysis
- Fig. 5 : Observations of identical panels
- Fig. 6 : Visual assessment ratings vs ΔE hunter'
- Fig. 7 : Visual assessment ratings vs ΔE hunter' with data placed into four quadrants
- Fig. 8 : Visual ratings vs ΔE 2000' with data placed into four quadrants
- Table 1 : Experimental rating scale |
| En ligne : |
https://drive.google.com/file/d/1vTW87lJyJBDepAPRfSWbjbwbD626aJGy/view?usp=drive [...] |
| Format de la ressource électronique : |
Pdf |
| Permalink : |
https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=31807 |
in COATINGS TECH > Vol. 16, N° 1 (01/2019) . - p. 28-38
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The National Coil Coating Association’s Color Experiment : Potential for converting to CIE color space and deltaE 2000 in COATINGS TECH, Vol. 16, N° 1 (01/2019)
