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.