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Assured A: Since the printed matter is composed of dots, the number of printed image lines refers to the number of screen lines per inch in the horizontal or vertical direction of the printed matter, that is, the number of screen network lines. The number of screen lines is called because the earliest print outlets are wired. The unit of the number of hanging lines is Line/Inch, or LPI for short. For example, 150 Lpi means that there are 150 network cables per inch. To screen images, the larger the number of linked screens, the greater the number of networks, the denser the network points, and the richer the level of expression. Because the computer image is a lattice, it is composed of pixels (the smallest unit of the image is called a pixel). The image resolution can be visually understood as how many pixels a line in a unit length describes in the horizontal or vertical direction. The more pixels used to describe this line, the higher the resolution. The unit of image resolution is generally Pixels Per Inch, which is usually expressed in English as PPI. For example, an image with a resolution of 300 PPI means that it has 300 pixels per inch in the horizontal or vertical direction; an image with a resolution of 720 I means that it has 72 pixels per inch in the horizontal or vertical direction. Some devices have similar resolution and image resolution, but they are represented by dots, so they are represented as Dot Per Inch, abbreviated as DPI. For example, an image scanner with a resolution of 1200 DPI has an image input accuracy of 1200 points per inch, or pixels. The 3600DPI laser imagesetter has an image output accuracy of 3600 laser spots per inch. Image resolution PPI and print resolution LPI (screen plus line number) are related and different: the image resolution is higher than the print resolution, generally 2 × 2 pixels or more to generate a network, that is LPI is DPI About one-half.
Analysis of Printed Image Adding Lines
What is the number of print image screens? What is the relationship between it and the resolution of the image, the resolution of the scan, and the output resolution of the imagesetter?