In the color printing process, the thickness and uniformity of ink have a great affect
on the color reproduction. The ink thickness uniformity is an important parameters of measuring
the quality of printing. Based on the fluorescent additives may absorb ultraviolet light and exit
blue light or visible light and by considering the expansion of the ink, optical properties of paper
with fluorescent additives , the internal lateral spread of light in paper with fluorescent additives
and the fluorescent Clapper-Yule spectral reflectance prediction model, we introduce two factor
parameters which are the initial thickness of the inks and the factor of ink thickness variation. A
model for deducing ink thickness variations of printing on the fluorescent substrate is developed
by the least square method and the spectrum reflectance of prints which measures the ink
thickness variations. The correctness of the conclusions are verified by experiment.
In the color reproduction process, accurately predicting the color of recto-verso images and
establishing a spectral reflectance model for halftones images are the great concern project of imaging quality
control field. The scattering of light within paper and the ink penetration in the substrate are the key factors, which
affect the color reproduction. A reflectance model for recto-verso color halftone prints is introduced in this paper
which considers these factors. The paper based on the assumption that the colorant is non-scattering and the
assumption that the paper is strong scattering substrate. By the multiple internal reflection between the paper
substrate and the print-air interface of light, and the light along oblique path of the Williams-Clapper model, we
proposed the color spectral reflectance precise prediction model of recto-verso halftone images. In the study, we
propose this model for taking into account ink spreading, a phenomenon that occurs when printing an ink halftone
in superposition with one or several solid inks. The ink-spreading model includes nominal-to-effective dot area
coverage functions for each of the different ink overprint conditions by the least square curve fitting method, so
the functions for physical dot gain of various overprint halftones are given. This model provided a theoretical
foundation for color prediction analysis of recto-verso halftone images and the development of image quality
detection system.
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