A scanner is a device that allows you to create digital copies from various objects (for example, from magazines or photographs). Unlike a digital camera, a scanner copies an image line by line, rather than the entire image. That is why scanners are inexpensive and can be bought by almost anyone.
Instructions
Step 1
First you need to decide on the type of scanner:
- flatbed scanners are of high quality and speed of work. In addition, scanning occurs in automatic mode, so using such a device is simple and convenient;
- the handheld scanner is not equipped with a motor, so you have to move the device yourself when scanning a document Such a scanner is distinguished by the lowest price and mobility, but at the same time it has a lot of disadvantages (for example, low resolution, slow operation speed, frequent stretching and skewing of the image);
Step 2
- sheet-fed scanners independently pull the sheet past the lamps. Due to this, such devices are much more compact than flatbed scanners; they can be used to copy sheets of any length;
- Drum scanners are mainly used in the printing industry and are professional. They provide high resolution, widest operating range;
- planetary scanners are designed for contactless scanning of objects. Such devices are especially useful for copying books that require careful handling.
Step 3
The optical resolution of a scanner is one of the most important characteristics of a device. The quality of the image, its clarity and legibility depends on this parameter. In stores, this parameter is indicated as follows: for example, 600x1200 dpi. In addition, in the characteristics of the device, you may encounter interpolated resolution - it differs in much higher values. When choosing a scanner, first of all, you need to pay attention to the optical resolution.
Step 4
In addition, the quality of the picture depends on the type of matrix. CCD matrices have the best performance, but at the same time they are the most expensive. The main advantage of a CIS matrix is energy saving. Such devices are connected to the network via a USB port.
Step 5
Depth of color. This indicator determines the number of colors that the device can recognize and process. Remember that the declared color depth may differ from the actual one, as the image is cleaned during scanning to make the picture clearer and cleaner. The device characteristics must contain the True bit mark - it shows the true color depth of the scanner.
