The dot is the basic unit that realizes the printed products can reflect the gradation of the publishing surface and the natural division of the tone of the tone (light and dark). It plays the role of determining the color, gradation and image outline of the printed matter in printing. Therefore, only the accurate dot size can faithfully reproduce the color of the original when making a plate, so as to ensure that the printing process achieves good results.
Because the shade of the printed product is expressed by the size of the dots, the dots with different areas are commonly known as "completion" in the process. Only by accurately understanding the concept of dot count can we use dots to print the closest to the original color. Therefore, understanding the number of outlets is the knowledge that printing operators and quality control personnel should master. The following is a summary of several kinds of outlets:
Identification of the number of dots within 50% is based on the number of black dots that can accommodate the same number of black dots on the opposite side. That is, in the gap between the two black dots on the opposite side, three black dots of the same size can be placed, which is 10% of the dots; if the distance between the two dots can accommodate two equally large dots, It is called 20% dots; if 1.5 dots of the same size can be placed between two dots, it is called 30% dots; if it can accommodate 1.25 dots of the same size between two dots, it is called 4 Formed into halftone dots; if one dot of the same size can be accommodated between the two halftone dots, that is to say, half of the black dots and white dots in the unit area occupy half, that is, 50% of the dots. The judgment of 50% based on the internet point is measured by how many white dots of the same size can be accommodated between the two white dots on the opposite side. Judging from the arrangement of dots, the number of dots contained in the distance between two white dots is exactly 60% and 40%; 70% and 30% are the same; 80% and 20% are the same; 90% and 10% are the same.
The above situation shows that the so-called dot count is the percentage of the unit area. For example, 10% of the dots are 10%, and 2 is 20%. For other analogies, 100% is the field layout. According to a rough analysis of the arrangement of positive dots, if the black dot is larger than the white dot, it is 50% of the dots; if the black dot is smaller than the white dot, it is less than 50%. The greater the number of dots, the darker the ink on the printed surface, and the lighter the converse. The size of the dot area determines the change of the layout level. Generally, the layers on the screen are divided into three tone levels, that is, the high-key layers are composed of 1 to 3 dots, so that bright parts are formed on the screen. The mid-tone layer represents the transition between bright and dark parts of the picture, usually composed of 4 to 60 dots. The dark and dark screen composed of 7 to 9% dots is a low-key level. The brightest part on the printing plate, that is, the highlight part is less than 10% of the dots.
In summary, only by accurately knowing the number of dots can we make good use of the changes in dots to produce a printing plate that conforms to the original, and print color-printed products with accurate colors and satisfactory quality. This is also the goal of quality management.
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