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Presentations 2015, 2016

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iarigai VIGC, Brussels
Evolutions in food packaging printing

You are here: Conferences & Events * 2008 Valencia * Abstracts * 4. Color reproduction and quality

4. Color reproduction and quality

4.10. Use of static and dynamic device link profiles: incidence on colorimetric accuracy and ink savings

Amélie Trichon(1), Lionel Chagas(1), Elie Khoury(2), François Fournié(2), Nadia Hassissi1(1)

(1) Pagora (the French Engineering School for Papermaking and Printing), formerly EFPG
BP 65 - Domaine Universitaire - F-38402 Saint-Martin d'Hères Cedex, France
E-mail: This e-mail address is being protected from spambots. You need JavaScript enabled to view it

(2) Alwan Color Expertise
The Graphic Industry Standardization Company
5 allée Alban Vistel, 69110 Sainte Foy lès Lyon, France

Abstract
ICC Profiles are standardized files that describe the color characteristics of devices, images and graphics using colorimetric standards. A digital document may be describe in various type of color formats. There are various classes of ICC Profiles. One of them is the class of DeviceLink Profiles. These contain a color transformation from an initial device color space directly into a second device color space. By using device link profile we can pay attention to printability specifications like color purity, TAC (Total Area Coverage). In this way, two options exist: a static or a dynamic device link profile. A static profile will apply the same adjustment to all the files whereas a dynamic device link profile will check the content of the file and optimize functions of the result. The aim of this study is to identify the interest of using device link profiles and to compare the dynamic device link profile and the static one in terms of colorimetric rendering, contrast and ink savings in case of inkjet printers. Until now it seems that dynamic profiles are better. The effect of device link profile was tested on different visual images and charts in format tiff and pdf with different kinds of settings, in one hand to test colorimetric accuracy and in the other hand to evaluate ink savings possibilities.

Keywords: Colorimetric accuracy, dynamic device link profile, ICC profile, ink savings, static device link profile

 

4.11. Estimating the spectral reflectance of fluorescent offset papers for varying illuminants

Eva Maria Löffler(1), Phil Green(2)

(1) Stuttgart Media University, Germany
Nobelstraße 10, D-70569 Stuttgart
E-mail: This e-mail address is being protected from spambots. You need JavaScript enabled to view it

(2) London College of Communication
Elephant & Castle, London, SE1 6SB, United Kingdom

Abstract
In this study a method will be introduced for estimating the spectral reflectance factor of fluorescent offset papers, illuminated by either a physical source or a standard illuminant. The method was developed in two steps. Initially a range of 80 commercially available offset papers was classified according to their amount of fluorescence emission. The fluorescence characteristics were determined by calculating the 'difference area' between spectral reflectance factors measured both with a UV-Cut-Filter and without. For this classification process a GretagMacbeth Spectrolino was used. The total bi-spectral radiance factors of eight papers representing approximately the steps from lowest to highest fluorescence efficacy were then measured with a double monochromator instrument, and a model was developed using these measurements, based on the observation that the fluorescence characteristics of different offset papers have similar shapes and can therefore be defined by a scaleable model spectrum. The model was evaluated by finding the CIEDE2000 colour differences between L*a*b*-values calculated from measured bi-spectral data and estimated bi-spectral data. The mean colour differences for the illuminants A, D50 and D65 were 0.40, 0.51 and 0.62 respectively.

Keywords: Bi-spectral, fluorescent whitening agents, fluorescence, illuminant, offset paper

 

4.12. Improving inter-instrument agreement in colour and density measurement

Andrew Williams

IFRA
Washingtonplatz 1
D-64287 Darmstadt, Germany
E-mail: This e-mail address is being protected from spambots. You need JavaScript enabled to view it

Abstract
One of the reasons why densitometry has failed the user in printing is the multitude of standards and the lack of a common agreement about how density should be measured. All the factors which contribute to measurement differences apply regardless of which of the major printing processes is used. The objectives were to improve measurement accuracy and precision for colour and density, to improve inter-instrument agreement and to maintain repeatability for hand-held spectrophotometers and densitometers.

The novelty of the paper lies in the compilation of the main factors that influence colour and density measurement together with a comprehensive study of the ISO graphic arts standards and TC130 documentation regarding these measurement instruments.

Further novelty has been added by some general observations and recommendations.

Keywords: Colour, density, ISO standards, measurement

 
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