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Juxtaposed Color Halftoning Relying on Discrete Lines

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Spectral reflection and dot surface prediction models for color halftone prints

Roger Hersch, Patrick Emmel, Frédérique Crété

The proposed new spectral reflection model enhances the classical Clapper-Yule model by taking into account the fact that proportionally more incident light through a given colorant surface is reflected back onto the same colorant surface than onto other c ...

2005

Method and apparatus for generating halftone images by evolutionary screen dot contours

Roger Hersch

The present invention is related to the synthesis, display and printing of halftone images. The invention comprises a method capable of generating screen elements with sophisticated screen dot shapes such as artistic shapes, microletters and ideograms. The ...

2004

Spectral prediction and dot surface estimation models for halftone prints

Roger Hersch, Patrick Emmel, Frédérique Crété

We propose a new spectral prediction model as well as new approaches for modeling ink spreading which occurs when printing ink layer superpositions. The spectral prediction model enhances the classical Clapper-Yule model by taking into account the fact tha ...

SPIE-Int. Soc. Opt. Eng2003

Reproducing color images with embedded metallic patterns

Roger Hersch, Patrick Emmel

By combining a metallic ink and standard inks, one may create printed images having a dynamic appearance: an image viewed under specular reflection may be considerably different from the same image viewed under non-specular reflection. Patterns which are e ...

ACM2003

Visually-based color space tetrahedrizations for printing with custom inks

Roger Hersch, Sylvain Chosson

Printing with custom inks is useful for extending the gamut of printed images, for creating artistically appealing designs or for providing protection against counterfeiting (security documents). The basic colors we consider, consist of the custom inks, th ...

Society of Photo-Optical Instrumentation Engineers2001

Multi-color and artistic dithering

Roger Hersch

A multi-color dithering algorithm is proposed, which converts a barycentric combination of color intensities into a multi-color non-overlapping surface coverage. Multi-color dithering is a generalization of standard bi-level dithering. Combined with tetrah ...

ACM, New York, NY, USA1999

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

Modèles de prédiction couleur appliqués à l'impression jet d'encre

Patrick Emmel

In order to guarantee good colour reproduction, modern printers use very large calibration tables based on the measurement of large sample sets. In this thesis, we aim at establishing an accurate colour prediction model which is able to compute the spectra ...

EPFL1998

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