Input and output devices

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Scanners

A scanner is a peripheral that reads images and converts them into electronic codes which can be understood by a computer. There are different types.
A flatbed is built like a photocopier and is for use on a desktop; it can capture text, color images and even small 3D objects.
A film scanner is used to scan film negatives or 35 mm slides – pictures on photographic film, mounted in a frame.
A hand-held scanner is small and T-shaped, ideal to capture small pictures and logos.
A pen scanner looks like a pen; you can scan text, figures, barcodes and handwritten numbers.
Barcode scanners read barcodes on the products sold in shops and send the price to the computer in the cash register. Barcodes consist of a series of black and white stripes used to give products a unique identification number.
The resolution of a scanner is measured in dpi or dots per inch. For example, a 1,200 dpi scanner gives detailed images than a 300 dpi scanner.
Most scanners come with Optical Character Recognition software. OCR allows you to scan pages of text and save them into your word processor; they can then be edited.



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   barcode      dpi      film      Flatbed      handheld      input      memory      pen      scanner      slides   
1. Scanners and cameras are devices used to transfer images into a format that can be understood by computers.
2. A lets you copy photos and printed documents into your PC.
3. It has become one of life’s most familiar sounds – the beep of the supermarket till whenever a is scanned.
4. If you need to scan 35 mm you should go for a dedicated 35 mm film scanner which concentrates all its dots into a tiny area.
5. The scanner has a resolution of 300 x 600 .
6. A scanner is small enough to hold in your hand.
7. A scanner is used to capture lines of text, barcodes and numbers.
8. Most digital cameras use flash cards to store photos.
9. scanners have a flat surface and take at least A4-sized documents.
10. To scan photographic negatives or slides you will need a scanner.