After 2000, it gradually transitioned to 1200ppi. At the beginning, the mainstream optical resolution was 300ppi.

Generally, horizontal resolution is used to determine the accuracy of the scanner, because the vertical resolution can be controlled by the stepper motor of the scanner, and the horizontal resolution is completely determined by the CCD accuracy of the scanner. PPI refers to the number of pixels per inch. The unit of resolution of the scanner is strictly defined as ppi, but people also mistakenly call it dpi. The optical resolution is directly related to the usual use. The scanner has two major resolutions, namely the maximum resolution and the optical resolution. Optical resolution is the most important factor when we choose a scanner. We will introduce the technical development of the scanner from the parameters that need attention when purchasing: Optical resolution Knowing the technical development of scanners and future development trends is very beneficial for us to buy machines. Just like printers, the technology of scanners is also developing with each passing day, and it is becoming more and more user-friendly. It is suitable for office automation (OA) and is widely used in sign panels, printed boards, printing industries, etc. It is composed of computer software and computer and output device (laser printer, laser plotter) interfaces to form a pre-screen computer processing system. Is the scanner an input device or an output device? The scanner is an input system in computer-aided design (CAD). The physical object is converted into a device that can be edited and added to the file. Photos, text pages, drawings, art drawings, photographic negatives, film films, and even three-dimensional objects such as textiles, sign panels, printed board samples can be used as scanning objects. Is the scanner an input device or an output device? Scanners are often used in computer external equipment by capturing images and converting them into digital input devices that can be displayed, edited, stored, and output by a computer.

Project on input and output devices