How to choose a home scanner

Understanding Technical Parameters

General scanners have the physical specifications of the resolution, color depth, dynamic range, photosensitive elements, as well as scanning format.

Resolution refers to the area can accommodate the number of colors per inch, such as 00DPI is said to contain 1200 color points within 1 inches, the higher the resolution of the scanner, the more detailed analysis of the image screen, the better the scanning effect. Color depth is mainly used to show the number of colors, it determines the image of the delicate degree, level, color dynamic range, with the same importance as optical resolution. Dynamic range refers to the scanner to distinguish between the high light and dark part of the level of ability, with "D" to express. The larger the dynamic range, the stronger the resolution of the hierarchy, the richer the hierarchy.

The photosensitive element is the key part of the scanner. At present, the scanner used in the photosensitive devices are mainly CCD and CIS two kinds. Compared with CCD, CIS has the advantages of small size, light weight, less device and higher seismic resistance. Common scanner format has A4, A4 lengthened, A3, and so on. Large-area scanner price is relatively high, the average home users choose A4 or. A4 lengthened.

To select the current domestic scanner market, the basic appearance of Violet, BenQ, the three-strong separation of the situation. Other common brands are canon, HP, AI-fat and so on. In general, the choice of these brands of products, quality and after-sales service will be guaranteed

Note that the current scanner common interface has SCSI, EPP, USB and the latest FireWire interface. When choosing a scanner, you must understand the characteristics and scope of the various interfaces, and then determine which scanner is more suitable for you. For home users, the general should choose to install a convenient USB interface scanner. Four is not to forget the random accessories and after-sales service. Now a lot of scanners are randomly attached to a whole bunch of software. such as: OCR, image editing software.