In the modern advanced Computing, the scanner is also referred as image scanner.The scanner is defined as the optical device that scans the images and text documents or even handwritten documents such as objects and converts it into digital image.
The common scanners found in the everyday life are the flat bed scanner. It is a device where the given document is put on a glass for scanning. Another type of scanners is the hand held Scanners. In these particular scanners the document to be scanned has to be moved by hand. This has been evolved to 3D Scanners for other industrial applications. Other scanners are mechanically driven typically for the large formats documents and where there is impossibility of flatbed design. In these present days, the scanners use a charge coupled device or even called as contact image sensors. These are advanced image sensory scanners not traditionally used.
Features of Scanner:
- Maximum Resolution is one of the most important characteristics for flatbed scanners. Simply put, scanner resolution is a measurement of the maximum unit of measure that the scanner can capture from the document to the image. Flatbed scanners normally measure resolution in dots per inch (dpi). A dot is a small spot that, when combined with others, forms a graphic image. The greater the dpi, the sharper and clearer the image will be, even at higher magnification.
- Bit Depth is similar to maximum resolution, except that it is a measurement of data. That is, how much data (number of bits) the scanner is capable of copying from an image. The higher the bit depth, the more colors the scanner can scan from an image. For example, a flatbed scanner capable of scanning at 24 bit depth can capture a total of 16,777,216 colors and a scanner capable of scanning at 48 bit depth can capture a total of 33,554,432 colors. This is an important consideration if you will be scanning photographic images.
- Maximum Document Size is also an important consideration when comparing flatbed scanners. This is a measurement of the largest size document that can be scanned at one time. As a minimum, you will want 8.5 inches by 11.0 inches. This will ensure that you will be able to scan a regular sized piece of typing or copy paper as one image.
- Interface is a description of how the flatbed scanner will connect and communicate with your notebook computer. Without the proper interface, the flatbed scanner you have chosen will not work properly and you will be back at the ATM for cash to add more money to your copy card. For this characteristic, less is definitely best. By far the easiest and most convenient interface is the USB connection. The current USB 2.0 connection provides a single cable both to power the flatbed scanner through your notebook computer and to send the scanned digital image to the notebook for manipulating and storage.
- Size and Weight can be just as important as the other characteristics highlighted in this guide. After all, just because you can super size your favorite fast food meal, it does not mean that you want to super size your flatbed scanner. You are a researcher, not a weight lifter.
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