Fluorescent brighteners in paper can emit visible blue lights or fluorescence after absorbing invisible
UV (ultraviolet) lights and the visible blue lights can increase the whiteness of the paper in the visual
effects. In this paper, we use the enhanced Clapper-Yule model to establish a new predicted reflectance
model for halftone image. The reflective law of halftone image on fluorescent supports is generalized
by utilizing the idea that the reflected light by fluorescent supports is divided into two parts: the
primary streams which consist of originally incident light and the fluorescent streams which are created
by absorption of the UV lights. Firstly, the spectral reflectance of the vacant fluorescent supports and
ink layer on fluorescent supports are analyzed. Secondly, the reflectance and transmittance of ink layer
on fluorescent supports are studied. Then the physical dot gain that results from the real extension of an
ink dot (i.e., ink spreading) is studied. Finally, we establish a reflection and transmission model for a
halftone image on paper with fluorescent additives. To prove the accuracy of the model, we make data
simulation with Matlab software and two reflectance curves (the reflectance of halftone image on paper
with and without fluorescent additives) were generated. From the results, we can make a conclusion
that the new model has a good accuracy to predict the reflectance of halftone image on fluorescent
supports.
By analyzing the different paths that the incident light traverses in the printing, the paper aims to study
the effect the transmission of light produces on the color reproduction of the plastic printing. The
article also analyzes object characteristics about the three color properties and the color density, so as to
make an accurate prediction on the color reproduction of the printing where ink is printed on the end of
the plastic base directly. In the research, the incident light on the plastic print are divided into two parts:
the reflection of diffuse light in the ink and the optical multi-layer internal reflection of the light
through ink layer onto the plastic substrate.
In this paper, we use kubelka-munk theory to analyze the transmission of the incident light on the
surface of the printing product and Clapper-Yule theory to analyze the incident light which through the
ink to the plastic film surface. When the incident light through the ink to the film surface, we have a
series of mutually parallel reflected beam and refracted beam, and then obtain the synthesis of the
reflected light complex amplitude, using the similar methods to obtain the total reflected and refraction
light intensity. Combining the total reflection light intensity through the plastic substrate and the overall
reflectivity through a plastic print surface by the kubelka-munk theory, color density and light
transmission factor of the plastic substrate can be drawn in the formula: D ∞ f (δ,d,i1 ). From the above equation, we can find that optical phase retardation δ, the thickness of plastic d and the angle of incidence on the plastic surface i1 affect the color reproduction of plastic print.
The research of color prediction model is one of the most important tasks in print
reproduction. By the conception of regular quadriface composed of two bifaces we
obtain the global transfer matrix of the quadriface from the single-step transition
probability matrix of the Markov chain. According to the optics character of
transparent plastic substrate, using the Markov chain of stochastic process theory,
considering the fact of total reflectance when light propagate to optically thinner
medium (air) from denser medium(ink and plastic substrate),we modify the
mathematic model of reflectivity and obtain the mathematic reflectivity model of
plastic substrate homochromous presswork.
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