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Predicting Monochrome Color Transmittance Spectra of Electrophotographic Prints

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Prediction of monochrome reflectance spectra with an extended Kubelka-Munk model

Roger Hersch, Patrick Emmel, Safer Mourad

We present a prediction model for digital printers and more specifically for electrophotographic devices. On the one hand, we propose an electrophotographic simulation model which estimates the microscopic structure of any printed toner layer based on its ...

Society for Imaging Science and Technology2002

Modeling ink spreading for color prediction

Roger Hersch, Patrick Emmel

This study aims at modeling ink spreading in order to improve the prediction of the reflection spectra of three ink color prints. Ink spreading is a kind of dot gain which causes significant color deviations in ink jet printing. We have developed an ink sp ...

Soc. Imaging Sci. & Technol2002

A Prediction Model for Reflection on Varnished Metallic Plates

Roger Hersch, Mathieu Hébert, Patrick Emmel

Several models predict the reflectance of a rough metallic surface. They are however not adapted to the surfaces used in the packaging industry, such as boxes made of printed metallic plates. For printing purposes, metallic surfaces need to be varnished. L ...

Society for Imaging Science and Technology2002

Predicting transmittance spectra of electrophotographic color prints

Roger Hersch, Patrick Emmel, Safer Mourad

For dry toner electrophotographic color printers, we present a numerical simulation model describing the color printer response based on a physical characterization of the different electrophotographic process steps. The proposed model introduces a Cross T ...

Society of Photo-Optical Instrumentation Engineers2001

Prediction of the Reflection Spectra of Three Ink Colour Prints

Roger Hersch, Patrick Emmel

We have developed a colour prediction model and an ink-spreading model. The present study aims at confirming the validity of both models for the case of ink-jet prints using cyan, magenta and yellow inks. Our colour prediction model, augmented by the ink-j ...

Society for Imaging Science and Technology2001

Parameterizable fonts based on shape components

Roger Hersch, Changyuan Hu

We propose a new, highly flexible font description method that explicitly describes characters as assemblies of parameterizable shape components. By varying global parameters, we can derive fonts that vary in weight, condensation, and shape. Fonts made of ...

2001

A Unified model for color prediction of halftoned prints

Roger Hersch, Patrick Emmel

This study introduces a new model and a new mathematical formulation describing the light scattering and ink spreading phenomena in printing. The new model generalizes the classical Kubelka-Munk theory, and unifies it with the Neugebauer model within a sin ...

2000

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

Structure artifact free multi-level error diffusion algorithm

Roger Hersch

Error-diffusion is widely used to generate intensity levels between the primary levels of multi-level colour printing devices (ink-jet printers, electrophotographic printers). Standard error-diffusion algorithms produce structure artifacts at rational inte ...

The International Society for Optical Engineering1998

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