Publication news

PhD defense – Teun Baar

CP7 researcher Teun Baar will defend his PhD thesis on October 16, 2015 at Télécom ParisTech, Paris, France. The title of his PhD topic is “Optimisation of print quality with multi-channel printing“. Teun’s PhD thesis advisors are Dr. Hans Brettel and Dr. Maria Ortiz Segovia. 

Abstract

There exist increasing interest in reproducing surface appearances by means of digital printing, thereby expanding the reproduction from only colour to including physical texture and reflection properties. Although currently in an early stage, advances have been made towards the control of print surface characteristics including colour, texture and gloss. In this thesis, contributions to the improvement of print quality with respect to these print characteristics are presented. First, a method is presented for the measurement of the physical surface texture, as a means to describe the print quality and limitations of 3D printing systems. A novel technique is introduced to improve the print quality of so-called triangular prints, where surface texture geometries are built to control the angular dependent reflection properties. Secondly, the influence of several print parameters on the optical and physical surface characteristics is studied, and the relationship between these different properties is found. From this study, it is concluded that variations among optical and geometric surface characteristics of prints can be well described by a single roughness parameter, which allows estimating optical properties from surface characteristics. From these findings, a strategy is developed where both colour and reflection properties of a printed surface are managed, by determining ink coverage values and print parameters. The advantage over previous attempts is that this method does not require any additional ink channels or machines. Finally, the gloss perception of the print surface was studied, resulting in a psychophysical relationship between measurable gloss levels and gloss perception magnitudes, and its dependence on the print surface colour and texture. This work will be particularly relevant for modelling and predicting print surface appearances, for the accurate control of reflection properties using digital printing systems, and will lead to a better understanding of the perception of printed gloss levels.

Paper published in Optics Express Journal

We are happy to inform that the paper submitted by CP7 researcher Ludovic Coppel (written in collaboration with the associate partner Mid Sweden University) is now published in the Optics Express Journal.

In this paper the authors perform Monte Carlo light scattering simulations to study the angular distribution of the fluorescence emission from turbid media and compare the results to measure angular distributions from fluorescing white paper samples. To access the journal paper please visit

https://www.osapublishing.org/oe/abstract.cfm?uri=oe-23-15-19552.

CIC 2015

We are happy to inform that the following paper submitted by Sepideh Samadzadegan at CIC 2015 is accepted in the Journal of Imaging Science and Technology (JIST) and will be presented at the CIC23 conference held in Darmstadt, Germany:

CVCS 2015

We are happy to announce that 2 papers submitted at CVCS 2015 by research fellows ‘Paula Zitinski Elías‘ and ‘Ludovic Gustafsson Coppel’ as part or their research in the CP7 project has been accepted. Congratulations to the researchers. 

ColourLab Logo RGB-03

Papers accepted at CVCS 2015:

1. “Multilevel halftoning as an algorithm to control ink overlap in multi-channel printing” by Paula Zitinski Elías, Sasan Gooran, Daniel Nyström, Institue of Technology Linköping University Norrköping, Sweden.

2. “Spectral gamut mapping and Ink separation with fluorescing substrates” by Ludovic Gustafsson Coppel, Gjøvik University College, Norway.

AIC 2015

CP7 researchers Teun Baar and Melissa Olen presented their research papers at the AIC2015 conference recently held in Tokyo, Japan. In total 3 papers were presented.  They presented their work on the 3D surface quality assessment of 3D surface, created with several fabrication methods. In their work, the use of relief printing was explored as a means to evaluate the surface rendered with engraving and printing technologies, via its impressions, similar to the traditional woodblock printing techniques of the 16th century. As a result, 2D impressions of the 3D elevated surfaces could be analysed using classic quality measurements, while assessing the 3D surface characteristics. More of their work on using engraved and printed plates for the creation of relief prints will be presented during the IMPACT conference in September  2015.

Furthermore, Melissa Olen presented a paper on work carried out in conjunction with Joseph Padfield from the National Gallery, London. The aim of this work was to extend the available range of printable dark colours by incorporating the use of alternative printing techniques to improve the colour match between printed reproductions and those measured within paintings in the collection of the National Gallery, London. For this study, a number of colour measurements were taken from the dark paint passages of one particular National Gallery painting, The Supper at Emmaus, by Michelangelo Merisi da Caravaggio. The results of the study show that the proposed alternative techniques are capable of producing a range of dark colours which more closely matched the original paint passages when compared with traditional printing workflows.

Work done by Srikrishna Nudurumati in collaboration with Phil Green and Ivar Farup at HIG was based on variability of colour matches between displays. Srikrishna and the team investigated the inter-observer variability in perceived colour matches in an experiment with 21 observers and using a CRT and LCD display.

AIC2015

Electronic Imaging 2015

We are happy to announce that 8 research papers have been presented and published at the Electronic Imaging conference (2015) held in San Francisco, USA in February 2015. The papers are as follows:

  • Slavuj, R.; Coppel, L. G.; Hardeberg, J. Y., Effect of ink spreading and ink amount on the accuracy of the Yule-Nielsen modified spectral Neugebauer model, Color Imaging XX: Displaying, Processing, Hardcopy, and Applications, SPIE Electronic Imaging 2015, San Francisco, (USA).
  • Slavuj, R.; Pedersen, M., Multichannel DBS halftoning for improved texture quality, Color Imaging XX: Displaying, Processing, Hardcopy, and Applications, SPIE Electronic Imaging 2015, San Francisco, (USA).
  • Samadzadegan, S.; Baar, T.; Urban, P.; Segovia, M. V. O.; Blahová, J., Controlling Colour-Printed Gloss by Varnish-Halftones, Measuring, Modeling and Reproducing Material Appearance, SPIE Electronic Imaging 2015, San Francisco, (USA).
  • Baar, T.; Brettel, H.; Segovia, M.V.O., Towards gloss control in fine art reproduction, Measuring, Modeling and Reproducing Material Appearance, SPIE Electronic Imaging 2015, San Francisco, (USA).
  • Olen, M.; Geisow, A.; Parraman, C., An Evaluation of the Transferability of Munsell’s Colour Notation Methodology to Modern Inkjet Printing Technology, Color Imaging XX: Displaying, Processing, Hardcopy, and Applications, SPIE Electronic Imaging 2015, San Francisco, (USA).
  • Le Moan, S.; George, T. S.; Pedersen, M.; Blahová, J.; Hardeberg, Y. J., A database for spectral image quality, Image Quality and System Performance XII, SPIE Electronic Imaging 2015, San Francisco, (USA).
  • Le Moan, S.; Preiss, J.; Urban, P., Evaluating the multi-scale iCID metric, Image Quality and System Performance XII, SPIE Electronic Imaging 2015, San Francisco, (USA).
  • Blahová, J.; Kirchner, J. J. E.; Dekker, N.; Njo, L.; van der Lans, I.; Urban, P.; Huertas, R., Goniochromatic-difference between effect coatings: is the whole more than the sum of its parts?, Measuring, Modeling and Reproducing Material Appearance, SPIE Electronic Imaging 2015, San Francisco, (USA).

Licentiate Thesis

Paula Žitinski ElíasWe are happy to announce that CP7 researcher Paula Zitinski Elias at Linköpings Universitet, Campus Norrköping, Sweden successfully defended her licentiate thesis on December 16, 2014 at Linköpings Universitet, Department of Science and Technology. Her licentiate thesis is entitled “Halftoning for multichannel printing – algorithm development, implementation and verification“.

The thesis comprises the research carried out in the area of halftoning algorithms applicable to multichannel printing, where the number of colorant channels imposes several challenges. The implementation of an amplitude modulated (AM) halftoning method for CMYKRGB printing was carried out, with no undesirable visual artefacts, thus allowing gamut expansion of the reproducible colours. In addition, a workflow for a multilevel FM halftoning algorithm was also introduced, which has the advantage of channel dependability, allowing several inks of same chromatic levels printed no ink overlap between them. 

CIC 2014


We are happy to inform that the following papers submitted by Teun BaarSteven Le Moan, and Sepideh Samadzadegan at CIC 2014 are accepted for oral presentations:

IARIGAI 2014

We are happy to inform that 3 papers submitted by the CP7 researchers are accepted at the IARIGAI 2014 conference to be held in Swansea, UK, in September, 2014.The accepted papers are:

  • Dot gain analysis from probabilistic spectral modelling of colour halftone, by Coppel, L.G.
  • Next generation printing – Towards spectral proofing, by Coppel, L.G.; Le Moan, S.; Slavuj, R.; Elías, P.Ž. and Hardeberg, J.Y.
  • Multilevel halftoning applied to monochromatic inks in multi-channel printing, by Elías, P.Ž.; Gooran, S. and Nyström, D.

Iarigai-Swansea

Licentiate Thesis

We are happy to announce that CP7 researcher G M Atiqur Rahaman at Voxvil has successfully defended his licentiate thesis on February 28, 2014 at Mid Sweden University , Faculty of Science, Technology and Media. This licentiate thesis is entitled “Image Analysis Approach for Modeling Color Predictions in Printing” and is in Natural Science. G M Atiqur Rahaman

The goal of the thesis work was to increase knowledge of how print media interactions affect the performance of colour prediction models and to use the image analysis methods developed in this thesis as a tool to characterise paper, ink or halftone prints in the paper and graphic arts industry. The thesis abstract can be downloaded here.

Electronic Imaging 2014

eiWe are happy to announce that 11 abstracts submitted at EI 2014 by the fellow researchers and scientists in-charge in this project have been accepted. Full papers will soon be submitted for the conference. 7 abstracts are accepted at the new Measuring, Modeling and Reproducing Material Appearance (MMRA), while 4 abstracts are submitted and accepted at Color Imaging XIX: Display, Processing, Hardcopy and Applications conference at the EI 2014. The papers accepted at MMRA are:

  • Baar, T.; Samadzadegan, S.; et al., Printing gloss effects in a 2.5D system, accepted at MMRMA, SPIE Electronic Imaging, San Francisco, CA.
  • Baar, T.; Shahpaski, M.; Ortiz Segovia, M.V., Image ghosting reduction in lenticular relief prints, accepted at MMRMA, SPIE Electronic Imaging, San Francisco, CA.
  • Rahaman, A.; Norberg, O.; Edström, P., Expansion of Murray Davies model to account more physical characteristics, accepted at MMRMA, SPIE Electronic Imaging, San Francisco, CA.
  • Le Moan, S.; Urban, P., A new connection space for low-dimensional spectral color management, accepted at MMRMA, SPIE Electronic Imaging, San Francisco, CA.
  • Coppel, L. G., Lateral light propagation and angular variation of the reflectance of paper, accepted at MMRMA, SPIE Electronic Imaging, San Francisco, CA.
  • Slavuj, R. et al., Measuring or Estimating Neugebauer Primaries for Multi-channel Spectral Printing Modeling, accepted at MMRMA, SPIE Electronic Imaging, San Francisco, CA.
  • Tisato, F.; Parraman, C., An investigation into the micro surface of artworks using alternative lighting techniques, accepted at MMRMA, SPIE Electronic Imaging, San Francisco, CA.

And the papers accepted at Color Imaging XIX: Display, Processing, Hardcopy and Applications conference are:

  • Rahaman, A.; Norberg, O.; Edström, P., Microscale halftone color image analysis: perspective of spectral color prediction modeling, accepted at Color Imaging XIX, SPIE Electronic Imaging, San Francisco, CA.
  • Olen, M.; Parraman, C., Reproducing the Old Masters: Applying colour mixing and painting methodologies to inkjet printing, accepted at Color Imaging XIX, SPIE Electronic Imaging, San Francisco, CA.
  • Qu, Y. Y.; Elias, P. Z.; Gooran, S., Colour prediction modeling for five-channel CMYLcLm printing, accepted at Color Imaging XIX, SPIE Electronic Imaging, San Francisco, CA.
  • Namedanian, M.; Nyström, D.; Elias, P. Z.; Gooran, S., Physical and optical dot gain: Characterisation and relation to dot shape and paper properties, accepted at Color Imaging XIX, SPIE Electronic Imaging, San Francisco, CA.

IARIGAI 2013

CP7 researcher Radovan Slavuj presented his work at the IARIGAI 2013 conference recently held in Chemnitz, Germany. His publication at IARIGAI 2013 talks about spectral printing models that can be used in printing and two halftone models which can implemented during spectral printing. The title of his research paper published is ‘Review and analysis of spectral characterization models and halftoning for multi-channel printing’.

CIC 2013


We are happy to inform that the following papers submitted by Steven Le Moan, Sepideh Samadzadegan and Philipp Urban at CIC 2013 are accepted for focal and oral presentations:

1. “Spatially Resolved Joint Spectral Gamut Mapping and Separation” by Sepideh Samadzadegan and Philipp UrbanTechnische Universität Darmstadt, Germany.

2. “Image Quality and Change of Illuminant: An Information-Theoretic Evaluation” by Steven Le Moan and Philipp Urban, Technische Universität Darmstadt, Germany.

AIC 2013

CP7 researchers Teun, Melissa, Paula and Radovan presented their research papers at the AIC 2013 conference recently held in Newcastle, UK. A total of 5 papers were presented and published in this conference.

The list of the papers published in AIC 2013 are as follows:

1. “The effect of media interactions in predicting spectral reflectance by color prediction models” by Atiqur Rahaman and Ole Norberg at Voxvil AB, Sweden

2. ” Feasibility study for textile color simulation with multichannel printing technology” by Radovan Slavuj, Kristina Marijanovic and Jon Yngve Hardeberg at Gjøvik University College, Norway

3. ” Multichannel printing by orthogonal and non-orthogonal AM halftoning” by Paula Zitinski and Daniel Nyström at Linköpings Universitet, Campus Norrköping, Sweden

4. “Exploration of Alternative Print Methodology for Colour Printing Through the Multi-Layering of Ink” by Melissa Olen and Carinna Parraman, University of the West of England, UK

5. “Colour and Texture appearance modelling of 2.5D prints” by Teun Baar and Maria V. Ortiz Segovia, Océ Print Logic Technologies SA, France

CVCS 2013

We are happy to announce that 2 papers submitted at CVCS 2013 by research fellows ‘Teun Baar’ and ‘Ludovic Coppel’ as part or there research in the CP7 project has been accepted for speaker and poster presentations. Congratulations to the researchers.

Papers accepted at CVCS 2013:

1. “A survey of 3D Image Quality Metrics for relief print evaluation” by Teun Baar, Hans Brettel and Maria V. Ortiz Segovia, Océ Print Logic Technologies SA, France

2. “Impact of illumination spectral power distribution on radiance factor of fluorescing materials” by Ludovic Gustafsson Coppel, Mattias Anderson, Ole Norberg and Siv Lindberg at Gjøvik University College, Norway and Mid Sweden University, Sweden.

Another paper (‘Method to estimate spectral reflectance from camera RGB values’) submitted by CP7.0 researcher Radovan Slavuj (work done during his Master thesis) has also been accepted at the CVCS 2013.

ICIP 2013

We are pleased to announce that the paper ” EVALUATING THE PERCEIVED QUALITY OF SPECTRAL IMAGES ” by Steven Le Moan and Philipp Urban has been accepted to the ICIP 2013 in Melbourne, Australia. Congratulation to the researches. For further information please click here.

IARIGAI 2013

The paper ” Review and analysis of spectral characterization models and halftoning for multi-channel printing” submitted by Radovan Slavuj from Gjøvik University College is accepted at the IARIGAI 2013.

AIC 2013

We are happy to announce that five abstracts submitted at AIC 2013 by fellow researchers in this project have been accepted. Full papers will soon be submitted for the conference.

Abstracts accepted at AIC 2013:

1. “The effect of media interactions in predicting spectral reflectance by color prediction models” by Atiqur Rahaman and Ole Norberg at Voxvil AB, Sweden.

2. ” Feasibility study for textile color simulation with multichannel printing technology” by Radovan Slavuj, Kristina Marijanovic and Jon Yngve Hardeberg at Gjøvik University College, Norway.

3. ” Multichannel printing by orthogonal and non-orthogonal AM halftoning” by Paula Zitinski and Daniel Nyström at Linköpings Universitet, Campus Norrköping, Sweden.

4. “Exploration of Alternative Print Methodology for Colour Printing Through the Multi-Layering of Ink” by Melissa Olen and Carinna Parraman, University of the West of England, UK.

5. “Colour and Texture appearance modelling of 2.5D prints” by Teun Baar and Maria V. Ortiz Segovia, Océ Print Logic Technologies SA, France.