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Improving the Yule-Nielsen modified spectral Neugebauer model by dot surface coverages depending on the ink superposition conditions

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A model for colour prediction of halftoned samples incorporating light scattering and ink spreading

Roger Hersch, Patrick Emmel

A model for color prediction of halftoned samples incorporating light scattering and ink spreading was presented. The spreading process was modeled by enlarging the drop impact according to the configuration of its neighbors and the state of the surface. T ...

Society for Imaging Science and Technology1999

Reproducing color images using custom inks

We investigate the general problem of reproducing color images on an offset press using custom inks in any combination and number. While this problem has been explored previously for the case of two inks, there are a number of new mathematical and algorith ...

ACM, New York, NY, USA1998

Multi-level colour halftonning algorithms

Roger Hersch, Isaac Amidror, Patrick Emmel

Methods for the halftoning of images on multi-level printing devices such as multi-level ink-jet printers are presented. Due to the relatively large size of single droplets, halftoning algorithms are still needed. However, since halftoning occurs between t ...

SPIE-Int. Soc. Opt. Eng1997

Predicting the spectral behaviour of colour printers for transparent inks on transparent support

Roger Hersch, Isaac Amidror, Patrick Emmel

A spectral colour prediction model is proposed and applied to an ink jet printer. We limit the field of investigation to transparent inks printed on a transparent substrate. The proposed method is based on the computation of the transmittance spectra of co ...

Society for Imaging Science and Technology1996

Dithering algorithms for variable dot size printers

Roger Hersch, Isaac Amidror, Patrick Emmel

Dither-based methods for the halftoning of images on multi-level printing devices such as multi-level inkjet printers are presented. Due to the relatively large size of single droplets, halftoning algorithms are still needed. However, since halftoning occu ...

IEEE1996

Halftoning by rotating non-Bayer dispersed dither arrays

Roger Hersch

We propose a new operator for creating rotated dither threshold arrays. This new discrete one- to-one rotation operator is briefly explained. We analyze its application to different dispersed- dot dither arrays such as hexagonal dispersed dither arrays and ...

Society of Photo-Optical Instrumentation Engineers, Bellingham, WA, USA1995

Reproduction couleur par trames irrégulières et semi-régulières

In the printing industry, one of the most common methods for reproducing halftone images using bilevel printing devices is clustered-dot ordered dithering. The images produced using this method are quite faithful to the original and are visually pleasing. ...

EPFL1995

Method and Apparatus for Generating Halftone Images by Discrete One-to-one Dither Tile Rotation

Roger Hersch

The invention relates to a method and apparatus for automatic high-speed generation of digital angled halftone screens, specially suited for obtaining screens approximating the irrational angles which are generally required by high-quality colour reproduct ...

1995

Drop-on-Demand Inkjet Printing of Functional Composites

Jürgen Brugger, Thomas Maeder, Mohammadmahdi Kiaee

Drop-on-Demand Inkjet printing can be used as an effective technique to deposit the sensing layer in chemical sensors. However, formulation of inks containing functional materials remains challenging due to rheological constraints imposed by the inkjet pri ...