What dot shapes are there?
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What are the shape of the dot? What are the characteristics of each? Why pay attention to the shape of the dot?
The shape of a traditional dot has a square dot and a circular dot. What is used more now is the chain point. The dots of the same size have different circumferences due to their different shapes. The circumference of the circular point is the largest, and thus the dot gain rate is the largest.
In the process of small to large dots, there are always parts that start to overlap, as shown in Figure 2. In this part, the overlap of the dots causes a sudden increase in the density of the printed matter, thereby destroying the continuity of the printed matter and causing a loss of gradation of some tone. For example, gradients can cause uneven transitions due to density jumps.
Among the above three kinds of dots, the square dots are overlapped at 50%, the circular dots are overlapped at about 70%, and the chain points are overlapped at about 40% and 60%. In contrast, the image quality of the chain dot is better because its overlap avoids the midtone and the lap is split twice, reducing the density jump. Because of this, if the contrast of the image is small and soft, such as a person image, a chain dot can be used; if the image contrast is large, a square or circular dot can be used.