Ms. Jie Chen Profile

Jie Chen

at Jiangnan Univ

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Proceedings Article | 25 January 2011 Paper

The transmission of light affect the color reproduction of plastic print

Jie Chen, Yi-xin Zhang, Gongcheng Shi

Proceedings Volume 7866, 78661L (2011) https://doi.org/10.1117/12.871993

KEYWORDS: Reflection, Printing, Color reproduction, Reflectivity, Refraction, Light scattering, Scattering, Absorption, Analytical research, Particles

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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.

Proceedings Article | 25 January 2011 Paper

Spectral reflection and transmission prediction model of halftone image on fluorescent supports

Gongcheng Shi, Na Dong, Yixin Zhang, Jie Chen

Proceedings Volume 7866, 78661K (2011) https://doi.org/10.1117/12.871660

KEYWORDS: Reflectivity, Halftones, Visible radiation, Ultraviolet radiation, Luminescence, Data modeling, Image enhancement, Image transmission, Reflection, Transmittance

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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.

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