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Flatbed scanners look and behave a lot like a photocopier. You lay the item to be scanned
on a glass plate and the scanning head passes below the glass.
Flatbed scanners are very versatile: you can scan objects in a variety of sizes and shapes,
including pages from a book, without damaging the original. While flatbed scanners are
the best choice for a wide variety of uses, if you plan to do a lot of text scanning (called
OCR for Optical Character Recognition) work, keep in mind that flatbeds only
accommodate one page at a time. Scanning multi-page documents can be a slow, tedious
process, because you have to manually remove one page and insert the next.
Sheetfed Scanners
Sheetfed scanners look and act more like fax machines. The page or item is fed into the
machine, scanned, then spit out on the other end . A sheetfed scanner is a good choice for
large volumes of text, but not for handling delicate original photographs. Scanning
directly from a book or other three-dimensional object is impossible.
Hand Scanners
Hand scanners are a low-cost alternative to their larger, more sophisticated cousins. As
their name implies, hand scanners are manual devices you move over a flat surface, just
as you do your PC's mouse
The hand scanner's advantages are many, but so are its disadvantages. Generally, hand
scanners work best for small, uncomplicated images such as company logos or small
black-and-white photographs. You might want a hand scanner if you don't plan to use it
on a regular basis, because it usually doesn't require adding internal cards to your CPU,
and it's easily disconnected and stored away. Most hand scanners can only scan a four-
inch wide image at one time and require a steady hand. You're usually provided with
software that helps you "sew up" a series of these 4-inch, side-by-side scans into one
image, but this is obviously not as convenient as getting the full image at once.
Color versus Grayscale Scanners
Scanners that can scan images in full color have become much more popular as their
prices have dropped. Just a few years ago, color scanners cost several thousands of
dollars, but can now be bought for a few hundred, depending on resolution and type.
Even so, grayscale (meaning shades of black and white only, no color) scanners are still
available and are significantly cheaper. In many cases, they are perfectly adequate for the
average user. Unless you have a color printer, or use your scanner to create artwork that
will only be viewed on-screen (such as for a Web page), there's no point in having a color
scanner. Consider this carefully before buying; however, what you think you'll never do
now could change as you grow more experienced and interested in computer technology.
Understanding Resolution and Dots Per Inch
Like printers, the technical capability (optical resolution) of a scanner is measured in dots
per inch (dpi). The higher the dpi, the sharper your on-screen printable image will be. The
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Earn Money
Trading Forex Online
Paramount Airways
Free Data Recovery
Cargo
Job Portal
HSBC Investment
Management
Cheap Web Hosting
Make Trip
Cheap Air Travel
Leisure Hotel
Free Air Travel
Mutual Fund Informations
Cheapest Cellular Plan
Free Sexy Indians
Call Center Software
Hot Indian
|
