What is the number of screens for printed images?
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Q: What is the number of screens for printed images? What is the relationship between image resolution, scanning resolution, and laser imagesetter output resolution?
Answer: Since the printed matter is composed of dots, the number of screened lines in the printed image refers to the number of lines per inch of the printed matter in the horizontal or vertical direction, that is, the number of hanging nets. The number of screens is called because the earliest print dots are wired. The unit of the number of hanging lines is Line/Inch (LPI). For example, 150Lpi means that there are 150 network cables per inch. Adding a picture to the image, the larger the number of nets, the more the number of nets, the denser the nets, and the richer the level of expressiveness. Because the computer image is a dot matrix, that is, one pixel (the smallest unit of the image is called a pixel). Image resolution can be visually understood as how many pixels are represented by a line in a unit length in the horizontal or vertical direction. The more pixels used to describe this line, the higher the resolution. The unit of image resolution is typically Pixels PerInch (pixels per inch), which is usually expressed in English as PPI. For example, if an image has a resolution of 300 PPI, it means that it has 300 pixels per inch in the horizontal or vertical direction; if the resolution of an image is 720I, it means that it has 72 pixels per inch in the horizontal or vertical direction. Some devices have resolutions similar to those of images, except that they are expressed in dots, so they are represented as Dot Per Inch, or DPI for short. For example, an image scanner with a resolution of 1200 DPI has an image input accuracy of 1200 dots per inch, or pixels. The 3600DPI laser imagesetter has a graphic output accuracy of 3600 laser dots per inch. The image resolution PPI and the printing resolution LPI (the number of screen lines) are related and different: the image resolution is higher than the printing resolution, generally 2 × 2 pixels generate 1 network.