Paper optical and surface properties
Partner: VV, Sweden
Fellow researcher: G M Atiqur Rahaman
Supervisor: Dr. Ole Norberg
In colour printing the result will depend on the physical properties of the substrate, the colorants used, and properties of the print engine, such as print resolution and adopted halftoning method. The optical properties of the paper, for example light absorption, light scattering properties and gloss level, together with the physical interaction between paper and ink will to a large extent influence the print result. Moreover, in colour printing the properties of the paper to be printed gives some prerequisites for the process. Properties of the paper decide the optimal amount of ink to be used for each ink channel, as well as the total amount of ink that can be mixed together on the paper. In spectral printing when a large number of ink channels are used, the total amount of ink that can be accepted by the paper might be critical to the performance of the printing system. Therefore, papers aimed for spectral printing should be designed by a different strategy compared to paper for traditional printing. Different approaches can be considered where for example one could aim to optimize the colour response to the amount of applied colorant and in another approach one could maximizes the ink receptive capacity of the paper.
The work of Atiqur Rahaman has been focused on modelling ink and paper interaction and light scattering in paper. Classical models such as Kubelka-Munk theory, Murray-Davis and Neugebauer has been implemented and evaluated. Atiqur has also proposed extensions to the Murray-Davis model to include the optical effect induced by the light scattering properties of paper. A major contribution is the experimental setup to separate areas in the printed image belonging to paper, ink and optical induced color. In the field of spectral printing these models can be useful tools in the ink selection process to find good ink set candidates. Furthermore, these models can also be used to estimate the colour transfer function.
Publication and Dissemination
- Rahaman, A. and Norberg, O. (2013), The effect of media interactions in predicting spectral reflectance by color prediction models, in ‘AIC Colour 2013’, International Colour Association, NewCastle upon Tyne, UK, pp. 593 − 596.
- Rahaman, A., Norberg, O. and Edstr ̈om, P. (2014), Extension of Murray-Davies tone reproduction model by adding edge effect of halftone dots, SPIE Electronic Imaging, San Francisco, CA, USA.
- Rahaman, A., Norberg, O. and Edstr ̈om, P. (2014), Microscale halftone color image analysis: perspective of spectral color prediction modeling, SPIE Electronic Imaging, San Francisco, CA, USA.
- Rahaman, A. (2014), Image Analysis Approach for Modeling Color Predictions in Print- ing, Mid Sweden University licentiate thesis, ISSN 1652-8948;108, Sunsdvall, Sweden.