Effect of light scatter on halftone color

Rogers, GL

doi:10.1364/josaa.15.001813

Cited by 30 publications

(14 citation statements)

References 10 publications

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“…[10][11][12] Reflectance models accounting for the internal Fresnel reflections are extensions of the Clapper-Yule model [13][14][15] or of the Kubelka-Munk model. 16 Recent extensions of the Kubelka-Munk model [17][18][19] concern absorbing and inhomogeneous scattering media, such as prints in which the solid ink partially penetrates into the diffusing substrate.…”

Section: Introductionmentioning

confidence: 99%

Reflectance and transmittance model for recto-verso halftone prints

Hébert

Hersch

2006

J. Opt. Soc. Am. A

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We propose a spectral prediction model for predicting the reflectance and transmittance of recto-verso halftone prints. A recto-verso halftone print is modeled as a diffusing substrate surrounded by two inked interfaces in contact with air (or with another medium). The interaction of light with the print comprises three components: (a) the attenuation of the incident light penetrating the print across the inked interface, (b) the internal reflectance and internal transmittance that accounts for the substrate's intrinsic reflectance and transmittance and for the multiple Fresnel internal reflections at the inked interfaces, and (c) the attenuation of light exiting the print across the inked interfaces. Both the classical Williams-Clapper and Clapper-Yule spectral prediction models are special cases of the proposed recto-verso reflectance and transmittance model. We also extend the Kubelka-Munk model to predict the reflectance and transmittance of recto-verso halftone prints. The extended Kubelka-Munk model is compatible with the proposed recto-verso reflectance and transmittance model. In the case of a homogeneous substrate, the recto-verso model's internal reflectance and transmittance can be expressed as a function Kubelka-Munk's scattering and absorption parameters, or the Kubelka-Munk's scattering and absorption parameters can be inferred from the recto-verso model's internal reflectance and transmittance, deduced from spectral measurements. The proposed model offers new perspectives both for spectral transmission and reflection predictions and for characterizing the properties of printed diffuse substrates.

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Section: Introductionmentioning

confidence: 99%

Reflectance and transmittance model for recto-verso halftone prints

Hébert

Hersch

2006

J. Opt. Soc. Am. A

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“…An important effect, optical dot gain, has been investigated both experimentally and theoretically, and is due to the scattering and diffusion of photons within the paper substrate. [1][2][3][4][5][6] Many workers start with a point spread function (PSF) as a way to quantify the effects of photon diffusion within paper. 2,6,7 It is generally taken that the PSF depends only on the characteristics of the paper, that the PSF is independent of the ink.…”

Section: Introductionmentioning

confidence: 99%

A generalized Clapper-Yule model of halftone reflectance

Rogers

2000

Color Res. Appl.

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The Clapper-Yule model of halftone reflectance includes the effects of light diffusion and multiple internal reflection between the ink-layer and the paper substrate. It models complete scatter-the case in which the distance a photon diffuses is much greater than the screen period. The current work generalizes this to any degree of scatter. The model is presented in terms of probability functions, and the probabilities are calculated from the paper's point spread function (PSF). Photon diffusion within paper is due to two processes: scatter and multiple internal reflection. The usually defined PSF includes both processes. Ink on the paper surface, however, alters the internal reflectance, and so the usually defined PSF depends on the percent ink coverage. The current model separates the effects of scatter from the effects of internal reflection. The PSF introduced here accounts for scatter only-it is independent of the percent ink coverage. It is shown that the generalized Clapper-Yule model corresponds to Yule-Nielsen n-values significantly greater than 2, unlike the case of no internal reflection for which the maximum n-value is equal to 2.

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“…Some of them are described in this book. Let us mention hdi053 initially published in [23], [24], [25], hdi052, hdi054 published in [26], hdi055, initially published in [27], [28], [29], [30], the KubelkaMunk model, see hdi062, Section 7 initially published in [31], [32] as well as ink penetration models [33], [25].…”

Section: Physically Inspired Modelsmentioning

confidence: 99%

Base Models for Color Halftone Reproduction

Hersch

Hébert

2015

Handbook of Digital Imaging

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One of the main challenges for the characterization of printing systems consists, for a given substrate, in establishing the relationship between surface coverages of the selected set of inks and the spectral reflectances of the printed ink halftones. Knowledge of the spectral reflectances of print halftones enables deducing their colors. Models enabling the prediction of spectral reflectances as a function of surface coverages of the inks are helpful in characterizing printers and in creating printer profiles. The presented base models for color halftone reproduction are either surface models such as the Yule-Nielsen modified spectral Neugebauer model or physically inspired models accounting for the interaction of light, inks and substrate such as the Clapper-Yule model. As a complement to reflectance prediction models, we introduce ink spreading models that account for the interaction between superposed ink halftones and the substrate. They help understanding and modeling the dot gain phenomena present in most printing systems. Finally, we compare the prediction accuracies of the different models for different printing technologies, paper types and screen frequencies.

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Effect of light scatter on halftone color

Cited by 30 publications

References 10 publications

Reflectance and transmittance model for recto-verso halftone prints

Reflectance and transmittance model for recto-verso halftone prints

A generalized Clapper-Yule model of halftone reflectance

Base Models for Color Halftone Reproduction

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