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Virtual Journal for Biomedical Optics

Virtual Journal for Biomedical Optics

| EXPLORING THE INTERFACE OF LIGHT AND BIOMEDICINE

  • Editor: Gregory W. Faris
  • Vol. 4, Iss. 2 — Feb. 10, 2009

Spectral prediction model for color prints on paper with fluorescent additives

Roger David Hersch  »View Author Affiliations


Applied Optics, Vol. 47, Issue 36, pp. 6710-6722 (2008)
http://dx.doi.org/10.1364/AO.47.006710


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Abstract

I propose a model for predicting the total reflectance of color halftones printed on paper incorporating fluorescent brighteners. The total reflectance is modeled as the additive superposition of the relative fluorescent emission and the pure reflectance of the color print. The fluorescent emission prediction model accounts for both the attenuation of light by the halftone within the excitation wavelength range and for the attenuation of the fluorescent emission by the same halftone within the emission wavelength range. The model’s calibration relies on reflectance measurements of the optically brightened paper and of the solid colorant patches with two illuminants, one including and one excluding the UV components. The part of the model predicting the pure reflectance relies on an ink-spreading extended Clapper–Yule model. On uniformly distributed surface coverages of cyan, magenta, and yellow halftone patches, the proposed model predicts the relative fluorescent emission with a high accuracy (mean Δ E 94 = 0.42 under a D65 standard illuminant). For optically brightened paper exhibiting a moderate fluorescence, the total reflectance prediction improves the spectral reflectance prediction mainly for highlight color halftones, comprising a proportion of paper white above 12%. Applications include the creation of improved printer characterization tables for color management purposes and the prediction of color gamuts for new combinations of optically brightened papers and inks.

© 2008 Optical Society of America

OCIS Codes
(100.2810) Image processing : Halftone image reproduction
(260.2510) Physical optics : Fluorescence
(330.1710) Vision, color, and visual optics : Color, measurement

ToC Category:
Image Processing

History
Original Manuscript: August 7, 2008
Revised Manuscript: November 4, 2008
Manuscript Accepted: November 5, 2008
Published: December 12, 2008

Virtual Issues
Vol. 4, Iss. 2 Virtual Journal for Biomedical Optics

Citation
Roger David Hersch, "Spectral prediction model for color prints on paper with fluorescent additives," Appl. Opt. 47, 6710-6722 (2008)
http://www.opticsinfobase.org/vjbo/abstract.cfm?URI=ao-47-36-6710


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  26. In all equations, the attenuation of light exiting though the print-air interface is modeled by the Fresnel diffuse transmittance term (1−ri). When performing measurements, this would imply that an integrated sphere is used to capture all exiting irradiance components. If a measurement instrument is used that captures the exiting radiance perpendicularly (θ=0°) or at a small angle (θ=8°), the exit attenuation term (1−ri)=0.386 appearing in Eqs. should, according to radiometric considerations, be replaced by the attenuation of the radiance across the print-air interface due both to Fresnel transmittivity and to cone spreading (1−rs(θ))/(nprint)2 in the present case (1−0.0438)/(1.532)=0.408 (see ). However, since both terms are numerically close one to another and since the print-air interface is not perfectly flat, I do not recommend performing these changes. This is consistent with observations by C. Kortüm who did not observe, for diffusely reflecting media, significant reflectance factor differences between collimated 45°/0° and integrated sphere 45°/d or d/0° measurement geometries .
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  29. G. Kortüm, “Optical geometry of the measurement arrangement,” in Reflectance Spectroscopy (Springer, 1969), pp. 170-175.

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