From the perspective of paper, there are three factors that affect the color difference of spot color ink: 1. Paper whiteness, paper absorbability, paper gloss and smoothness. The author analyzes these factors in detail.
1. Paper whiteness
The paper with different whiteness (or with certain color) has different influence on the color appearance of printing ink layer. For the same kind of white board paper, the color difference of printing ink layer is mainly reflected in the amount of black ink in spot color ink, especially for the color with brightness above 70, which causes great difference in the proportion of spot color ink. Therefore, in order to reduce the influence of paper whiteness on printing color, the paper with the same whiteness should be selected in actual production.
2. Paper absorption
When the same ink is printed on different absorbent paper under the same premise, it will have different printing luster. The structure of paper determines that there are concave convex and pores formed by plant fiber on the surface of paper. In order to obtain good average and smoothness of paper surface, different thickness of coating should be coated on the paper surface. The nature and thickness of the coating determines the paper surface facing ink absorption capacity. Different absorption capacity, must make the color of the printing ink layer. Compared with coated paper, the black ink layer will appear dull and dull, and the color ink layer will drift, and the color ink layer will drift. The color performance of the blue ink and magenta ink is the most significant.
3. Paper gloss and smoothness
The glossiness of printed matter depends on the glossiness and smoothness of the paper. The surface of printing paper belongs to semi gloss surface, especially coated paper.
On color printed matter, when the light irradiates the paper surface with 45 ° incident angle, about 4% of the light will be reflected off, which is the reflection light of the first layer surface. And the rest of the incident light through the ink layer, after selective absorption of the ink, and then reflected through the ink layer, into the human eye, is perceived by the human eye, this is the color we observed. If the glossiness and smoothness of the paper are high, the reflected light on the first surface is specular reflection, which is not easy to enter the human eye. The color observed at this time is basically the color reflected through the ink layer. If the surface of the paper is rough and glossy, the first layer of surface reflection light will be diffuse reflection, at this time we see the color is the mixture of the main color light and the first layer of surface reflection light. Because it contains white light component, it reduces the saturation of the main color light, so people feel the color becomes lighter when they observe the printed matter. When measured with a densitometer, the density value decreases and the lightness rises.
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