Scanners Buying Guide

A scanner is a device that allows paper documents & photographs to be converted into digital copies. For basic scanning use, an entry level machine with an optical resolution of 600 dpi (dots per inch) or less will be sufficient. This resolution quality is perfectly adequate for simple format documents and will view well on most monitors. For more advanced scanning, a flatbed scanner may be more suitable. These allow A3 scanning and include digital image editing software.

What to look for in a Scanner

The first thing you need to consider is what type of documents you are going to be scanning. Flat scanners are the most popular type of scanner as they can digitalise all types of documents scanners.

Colour sampling depth is measured in bits. This is the number of colour gradation that the scanner is capable of. The higher the number, the better the quality of the scan. A scanner of 10 bits can distinguish 1,024 colours, 24 bits can distinguish 16.7 million colours and 42 bits can distinguish 440 billion colours.

Optical resolution is measured in dots per inch (dpi) and is the quality indication of the scanner. The higher the number, the better the quality. A minimum resolution would be at least 600×600 dpi.

In common with most external devices, scanners connect to your computer via a USB port. These are both fast and easy to use, and ensure the scan quality is maintained.

Scanner Software

Image editing software provided either with or for use with scanners are scanner specific versions of the full software package. They have much less code and can sometimes have slightly less features but are more than adequate for use with scanners.

Character recognition software is a major plus point when using scanners. This software can read a “text image” and transform it into a classic text document. Today the standard recognition rate is close to 100% but some minor alterations may be necessary on occasions.

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