1. Performance parameters
① Scanning format: Scanning format usually has specifications such as A4, A3, A3+. Large-format scanners are more expensive. Generally, it's better for office users to use A4 format scanner than the A3 page scanner.
② Optical resolution: It reflects the clarity of the scanned image. The higher the resolution, the sharper the scanned image. Resolution is usually expressed in dots per inch of length dpi. "Highest resolution" is generally not used as a reference indicator. At present, the optical resolution of products with a higher market share is mostly 600x1200dpi and higher. It is recommended not to buy scanners with optical resolution below 300dpi.
③ Color digits: It reflects the ability to distinguish the color of the scanned image. The higher the number of color bits, the richer the color of the scanned image. 42bit (gradually increased to 48bit) refers to the number of color bits input, but the number of bits actually output to the computer is often not so high (generally 24bit), and this is the number of colors actually obtained.
④ Photosensitive element: It is the eye of the scanner. The common photosensitive elements used in the scanner are CCD and CIS. CCD technology is currently the most mature platform scanner and its performance is superior. CIS, often used in high speed portable scanner, are characterized as low-cost, lightweight, thin thickness, easy to carry, and suitable for the mobile office environment.
2. Supporting software
In addition to the driver program and scanning operation interface, the functions of ordinary scanners or professional scanners must be implemented by corresponding software. For users unfamiliar with graphics processing, it is recommended to choose a matching scanner that provides simple operation. If you choose improperly, it is best to provide more detailed instructions in Chinese for scanners that have certain difficulties in operation. The selection of OCR software is very important for office users. When choosing, pay attention to whether they can recognize various printed handwriting, forms, and whether they can recognize Chinese and English mixed layout.
It refers to the connection between the scanner and the computer. Common interfaces include SCSI interface, EPP interface, and USB interface (USB1.1 and 2.0), FireWire (1394). It is recommended to buy a USB2.0 interface. The USB interface scanner is fast and supports plug and play. It is very convenient to connect with the computer and has become the mainstream of the current peripheral interface.
4. Brand selection
Professional scanners are precision equipment. Therefore, when choosing a professional scanner, choose a good quality and durable scanner for libraries, archives, and public prosecution agencies. The non-contact unwinding and unwinding scanning method can scan the books and files without disassembly, which greatly improves work efficiency. The brand scanners have not only quality guarantee, but also perfect after-sales service.