In the modern world, the bulk of the development is computer technology. They entered our lives and found application in almost all areas of human activity. All equipment is divided into devices for input and output of information, as well as a central processor.
With interconnected work, they are able to quickly perform various tasks. In order to navigate in a wide variety of equipment, it is necessary to know the technical characteristics and features of functioning. This will help compare different models to choose the best one.
One of the devices for entering information into the computer database are scanners. They provide the loading of data in graphic format from a print medium. Depending on the technical characteristics, the materials used, the build quality, the resulting quality will differ for different versions of the equipment. This should be considered when choosing and buying a scanner.
There are many parameters that play an important role in ensuring high-quality data transfer to electronic format. One of the most significant selection criteria is optical resolution. Before comparing models for this indicator, it is necessary to find out its main purpose. This will help to understand the definition of a concept.
Optical resolution is one of the most indicative criteria used to evaluate the quality of a scanner. This parameter shows the number of recognizable points of an entire image area. This indicator indicates the maximum allowable number of points that the scanning device can recognize from the area of the printed page.
All electronic files and printed documents consist of many small dots (pixels), the uniformity of color distribution on the surface of the screen or paper sheet depends on their number, depending on the type of data presentation. Each pixel carries an encoding with information about one color or its hue. Therefore, the more pixels used for encoding are located on the sheet, the brighter and more saturated the display of a document or photograph will be.
Important! In addition to brightness and saturation, optical resolution affects the clarity of the display.
A large number of points smooth the edges, forming a clear picture. If there are few points, then the picture will consist of squares with uneven edges, which will significantly degrade quality.
To understand the basic principle of evaluation, it is worth examining the units of measurement designed to determine its value. In the classical description, there are two types of measurand:
- The most common for users are dpi units (dots per inch), it is this parameter that developers indicate on the body of their equipment and in the instruction manual. It displays the number of dots placed on a one-inch strip. The indicator is similar to that of printers, only in this case it allows you to evaluate the reading ability of the scanner (shows how many pixels the device can convert to electronic format for entering into the computer database). Usually indicated in the format: 300 × 300, 600 × 600 ...
- Another measurement option is spi (samples per inch) - this is the number of samples that the scanner can make when working with a printed page. In this case, information is given on how many times the technician views the image located on one inch. For example, with 300 readout sensors on one inch, the resolution would be 300 spi. Such a criterion is more informative.
Important! When choosing a scanner with an indication of resolution in dpi format, you should pay attention to the first number, it is it that shows the ability to scan data.
This concept is a general term for optical and interpolation resolution. Together, they show the maximum number of points that a device can recognize and encode for transfer to the matrix. The higher these indicators, the better the final image will be formed.
Also, the ability to change the scale of the received image on the monitor screen without changing the quality, while maintaining the clarity of the contour and borders, depends on this parameter.
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