Tuesday, September 29, 2009

Tips on buying a scanner

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While digital communication has been established, many documents, invoices or photographs are printed on paper yet. It is customary to keep them on the computer for better organization, so you'll need a scanner to scan. Before buying one, however, must take into account the role fulfilled, since the requirements are different if you want to scan photos, scan documents or do graphic design work in professional environments. The following explains what factors determine the choice.


The maximum resolution is a crucial aspect in buying a scanner. A higher resolution, better quality of the scanned image. This data is shown by the number of dots per inch (in abbreviation, "ppp" or "dpi") that captures the device.

There are two technologies of resolution: optical and interpolated. The optical resolution, or actual, shows the amount of individual points of an image captured by the sensor. Interpolated resolution is accomplished with a software procedure, ie an artificial resolution that generates new points from other real closer. Each time you increase the image by interpolation, the number of points generated is larger, the image loses real information on their composition and, consequently, low quality. In addition, users can set the scanning resolution, ranging from minimum to maximum 75 dpi interpolated resolution.

A higher resolution, better quality of the scanned image

When scanning an image, one must seek to work with a resolution that exceeds the final image that was desired, since by reducing it will not lose information between points and, therefore, maintain the quality during the scanning process. By contrast, when working with a screen whose resolution is lower than desired in the final image and quality information will be lost.

When using the scanner to digitize copies and keep all your information, you must choose a team with a good optical resolution. If you want to scan documents, the interpolated resolution is a good solution, provided that the scan will clearly display text characters.

Software Included

It is recommended that the software that came with the scanner to control their functions easier to use and configure, since the application will be used to scan documents and images. These devices include a driver (controller), known as "Twain", which allows using the scanner from any application that has support for it. It can scan an image or a document without using an intermediate program.

If we then intend to use the scanner to scan documents, you should have a software optical character recognition (OCR), which converts these images into a plain text.


Two sensor technologies are suitable for scanning images. Most scanners available on the market use CIS or CSD. Each capture images in a differentiated way. Technology scans CIS (contact image sensor) have several modules located below the scanning glass, optical information capturing 24 bit.

CSD (charge-coupled device) with photoelectric cells that record an image, with a speed and color depth greater than that of CIS. It is therefore suitable sensor technology to scan documents at high resolution

Color Depth

This value indicates the scanner's ability to process the color depth and contrast of an image. The range most often used to work is 24 bits, but has developed a device that works with a greater color depth, as 32 bits and 48 bits. As a rule, deeper color, greater precision in the details, allowing, in large images, captured in digitizing its entire color range. This factor is of great importance for the functions intended for professional graphic design environment.

Transparency Adapter

To scan photographic negatives or slides, use an additional adapter that translates the transparency to a suitable file size. It is advisable to ensure that the device chosen include this among the accessories. Otherwise, you will have to buy it independently.

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