When the ink is transferred to the surface of the paper under the pressure, due to the absorbency of the paper, the ink diffuses around when it penetrates, resulting in an increase in dots, making the entire image darker. Obviously, for different qualities of paper will produce different dot gain effects. The stronger the absorption of paper, the greater the value of the dot expansion. Specifically, newsprint is the largest and art paper is the smallest. The increase of the dots formed by the performance of the paper generally exhibits an exponential expansion law. In the process of prepress processing, it is necessary to compensate for the impact of the increase of the dots.
For dots of different sizes, the dot increase value is different. Generally, the increase value of high-tone and dark-tone dots is small, and the increase value of mid-tone dots is large. It is generally recommended to use the default settings. For example, when printing on coated paper, the default value is about 17%, offset paper is about 22%, and newsprint is about 30%.
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