What are the main technical indicators of the scanner?

There are 5 main technical indicators of the scanner: 1. Resolution, which indicates the scanner's ability to express image details, usually expressed by the number of pixels contained in the scanned image per inch of length; 2. The gray level indicates the brightness level range of the grayscale image. The more levels, the larger the brightness range and richer levels of the scanner image; 3. The number of colors indicates the range of colors that the color scanner can produce; 4. Scanning speed is usually represented by the scanning time under a certain resolution and image size; 5. Scanning format, which represents the size of the scanned artwork.

The operating environment of this tutorial: Windows 7 system, Dell G3 computer.

A scanner is a device for capturing images. As an optical, mechanical and electrical integration computer peripheral product, the scanner is the third largest computer input device after the mouse and keyboard. It can convert images into a digital format that can be displayed, edited, stored and output by a computer. It is a very powerful input device.

Performance indicators of the scanner

The performance indicators of the scanner mainly include resolution, gray level and number of colors. In addition, there are Scanning speed, scanning format.

Resolution

Resolution represents the scanner's ability to express image details, usually expressed by the number of pixels contained in the scanned image per inch of length. , that is, Dot Per Inch.

Grayscale

Grayscale represents the brightness level range of a grayscale image. The more levels, the wider the scanner image brightness range and the richer the layers.

Color number

The color number indicates the range of colors that the color scanner can produce. It is usually represented by the data leap number that represents the color of each pixel, that is, bits. For example, 36bit means that there are 2^36 colors on each pixel.

Scanning speed

Scanning speed is usually expressed by the scanning time under a certain resolution and image size.

Scanning format

indicates the size of the scanned artwork, the common ones are A4 format, others include A3, A0 format, etc.

Interface type of the scanner

The interface refers to the connection method between the scanner and the computer , common ones include SCSI interface, EPP interface and USB interface.

The SCSI interface scanner is connected to the computer through the SCSI interface card. Its main advantage is fast data transmission speed. The disadvantage is that the installation is more complicated and requires an expansion slot and limited computer resources (interrupt number and address) .

EPP interface (printer parallel port) can connect scanners, printers and computers with cables. It is easy to install and can be connected to laptops. But its data transfer speed is slightly slower than that of SCSI interface scanner.

USB (also known as universal interface mode) is a serial interface that supports plug-and-play. The scanner is fast and the connection to the computer is very convenient.

Routine maintenance of scanner

1. Pay attention to noise pollution.

Noise pollution is often easily ignored by people. Noise has varying degrees of harm to both the human body and equipment.

2. Avoid vibration

The new scanner is lighter in weight. During the scanning process, external vibration will blur the scanning effect.

3. Regular cleaning

Due to the electrostatic characteristics of the scanner, dust and dirt are easily adsorbed and accumulated, which greatly affects the power of optical devices and transmission devices. If this happens for a long time, the internal mechanical components will be worn, and the scanner will have problems such as loud scanning noise, image misalignment, and blurred images. Therefore, cleaning is a crucial step in scanner maintenance.

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