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A scanner is a device that captures images from photographic prints, posters, magazine pages, and similar sources for computer editing and display. Scanners come in hand-held, feed-in, and flatbed types and for scanning black-and-white only, or color. Very high resolution scanners are used for scanning for high-resolution printing, but lower resolution scanners are adequate for capturing images for computer display.
A scanner is an electronic device which can capture images from physical items and convert them into digital formats, which in turn can be stored in a computer, and viewed or modified using software applications.
FEATURES OF A SCANNER
- The Feeder Type
To begin with, you want to find out what kind of scanner you want which breaks down to two main categories: flatbed and sheetfed. A flatbed scanner will just offer a flat surface upon which you place the document for scanning, close the lid, and hit the scan functions. A sheetfed scanner utilizes a feeder port will bring documents into the scanner in order to be scanned.
- Compatibility of the Software
You also have to consider the software that you need in order to run the scanner, and if you can get it to work with the kind of computer you have. Make sure you look at the drivers that device needs specifically to work; they can often come with the scanner, but you might have to update them from time to time in order to get them to work. And always make sure a scanner with work with your operating system, be it a PC or a Mac.
- Color Depth and Resolution
In the event you are concerned about how good the image looks in the scanner, take a look at the resolution and color depth that is offered with that scanner. The DPI, or dots per inch, is what determines the resolution; the higher the DPI, the better the image will turn out all things being equal. When looking at color depth, you are finding out the amount of color that every pixel can receive; the higher the depth, the better the quality of the image. These criteria are especially important when comparing the photo scanners where the image quality is critical.
- Scanning Bed Size
You will find many flatbed scanners to hold anything of legal paper or smaller size (8.5″ x 14″). For those people who want to scan bigger images than that, you will either need a large flatbed scanner or utilize a software stitching program for piecing together multiple small scans of a large item. There are actually large format scanners that will scan up to an 11×17″ size.
- Reliability
Unlike certain forms of data transmission, scanning involves only transfer of hard images to digital forms. The role of the end-user is limited in case of scanning. And as they are not dependent on two-way communication, they can also help in storing important information or transmitting important information.
- Efficiency
Modern scanners are built for efficiency and speed. And it comes with ease of use as well as convenience.
- Quality
Scanning ensures the best resolution possible for digital images. Compared to fax machines, which may find it difficult to reproduce the accurate details, scanners can reproduce images with high resolution and precision. They are quite useful for photography and engineering arenas.
- Cost saving
One of the biggest advantage of scanning is the replacement of physical files/forms with digital ones. Along with saving physical space, which has to be used for storage, there are also environmental benefits by using scanner.
TYPES OF SCANNERS
- Flatbed Scanners
They look like miniature printers with a flip-up cover protecting the glass platen. Depending on its size, a flatbed scanner can fit standard or legal-sized documents, and the flexible cover allows you to scan large items such as books. These scanners are great for scanning the occasional newspaper article, book chapter, or photograph; or for those who may need to scan or bulky items such as the cover of a DVD. Flatbed scanners are often built into multi-function printers
- Photo Scanners
Scanning documents doesn’t require high resolution or color depth, but scanning photos does. Many all-purpose scanners can also scan photos, meaning that you don’t need a separate device to handle your photographs. But if you need a scanner primarily to digitize film negatives or slides, a photo scanner is a better deal (even if it is considerably more expensive than an all-purpose scanner). Photo scanners include specialized technology so that they can deal with slides and negatives; they also have built-in software to clean up old photos.
- Sheetfed Scanners
Sheetfed scanners are smaller than flatbed scanners; as the name implies, you feed a document or photo into the scanner's automatic document feeder, or ADF, rather than place it on top of the platen one photo or document at a time. You’ll win back some of that desktop space with a sheetfed scanner but you may sacrifice some resolution in the process. If you’re only scanning documents, however, it may be a worthwhile trade, especially if you’ve got a lot of them since you can feed them in bunches. With a flatbed scanner, you’ll have to scan one page at a time (unless it comes with an automatic document feeder).
- Portable Scanners
Portable scanners are small enough to bring on the road. In fact, some are small enough to put in your pocket; pen scanners are just a bit bigger than fountain pens and can scan the text of a document line by line. Some are as wide as a page and roll easily down the page. They’re not going to give high-resolution scans and so aren’t good for scanning photographs or other applications where you need a high-quality result. Since they’re not cheaper than flatbed scanners, they’re probably only useful if you are a student, a researcher, or a spy.
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