Scanners

Scanners are input devices that are used to capture images, documents, posters and other similar sources into the computer for editing or for display. Scanners come in various types, hand-held, flatbed, or scanning black and white only. High-resolution scanners recognise more colors and are used for high-resolution printing and for creating posters, brochures etc. Low-resolution scanners are adequate for normal tasks like scanning an image or document.

The factors to check for when purchasing a scanner are the DPI (dots per inch)-the scanning resolution, number of colors and scanning speed.

Scanners can also be used for Optical Character Recognition (OCR), that is, the ability to recognize the text on a scanned document, thereby possibly allowing to directly modify the contents of the documents in a word processor.

Some of the prominent companies that manufacture scanners are Hewlett Packard, Canon, Microtek and Epson.