The scanner is a device that lets a computer user put articles photographs as well as other things into there IT Services St. Louis computer for viewing or printing. There are two main types of computer scanners. This type of scanner is not all that common nowadays and is not particularly popular. With this type of scanner you can only feed a single sheet of paper to be scanned into the scanner at a time. The flatbed scanner This scanner is definatley the more popular of the two and is much more widely used both by business’s and the home user.
It is a flat piece of hardware that has its own power supply and has to be connected to the computer by a cable. A cover is lifted exposing a sheet of glass which you lay whatever you want to copy. Many flatbed scanners can also copy negatives and slides. These are a little more expensive but like most computer hardware prices are coming down rapidly. There are also other types of scanners such as handheld scanners but these are used mainly in shops to tell the checkout cashier the price of an item. Some of the more popular makes of scanner are – Hewlate Packard (HP) , Canon & Epson. Some points to consider when purchasing a scanner.
If you will use it just to scan text buy a low-resolution scanner only. If your not going to scan from books or magazines, consider a sheet-fed unit, which takes up less desk space than a flatbed scanner. Purchase a low-resolution or medium-resolution scanner if you plan to scan photographs to use on the Internet, as the resolution of Web graphics is low anyway. Purchase a high-resolution scanner if you plan to scan photographs to print and you have a high-resolution printer (greater than 600-by-600 dots per inch, or dpi).
Buy a model with 36-bit color depth if you plan to scan photographs or color graphics. Purchase a parallel-port scanner if you don’t expect to use the scanner often or work with large files. Remember that even scanners that cost less than $100 will provide a good copy ‘600-by-1,200-dpi resolution. Scanners priced between $150 and $250 usually provide 1,200-by –to over 8,000 dpi of resolution. Remember that speed is the biggest factor in pricing. Parallel-port scanners, which use your existing printer port, are the cheapest but slowest. USB scanners, which require that your computer have a USB port, are faster and cost a bit more.