A scanner is a computer-based external device that captures, converts, and converts images into digital input devices that computers can display, edit, store, and output. Three-dimensional objects such as photos, text pages, drawings, art pictures, photographic negatives, film films, and even textiles, signage panels, and printed board samples can be used as scanning objects to extract and transfer original lines, graphics, text, photos, and planes. Physical objects are converted into devices that can be edited and added to files.
Technical indicators <br> <br>
resolution scanner resolution is the most important technical indicator, which indicates the performance capabilities of the scanner image detail, that determines the degree of detail recorded by the scanner images, in units of PPI ( PixelsPerInch). It is usually expressed by the number of pixels contained in the scanned image per inch of length. At present, the resolution of most scans is between 300 and 2400 PPI. The larger the PPI value, the higher the scanning resolution and the quality of the scanned image, but this is limited. When the resolution is greater than a certain value, only the image file will be enlarged and difficult to handle, and the image quality cannot be significantly improved. For screen printing applications, scanning to 600 PPI is sufficient.
There are two general scan resolutions: real resolution (also known as optical resolution) and interpolation resolution.
The optical resolution is the actual resolution of the scanner, which determines the key performance indicators for image sharpness and sharpness.
Interpolation resolution is to increase the resolution value by means of software operation. That is, interpolation information is used to fill the missing information around the sampling point. Therefore, it is also called software-enhanced resolution. For example, the optical resolution of the scanner is 300 PPI, and the image can be increased to 600 PPI by the software interpolation algorithm, and the detailed information obtained by the interpolation resolution is less. Although the interpolation resolution is not as good as the true resolution, it can greatly reduce the price of the scanner and is useful for some specific tasks such as scanning black and white images or enlarging smaller originals.
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gray level represents the luminance gradation level range of the image. The more the number of stages, the larger the brightness range of the scanner image and the more abundant the level. At present, most scanners have a gray level of 256 levels. Among the 256 gray levels, there are more gray levels than can be identified by the naked eye.
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number of colors represented by the number of colors the color scanner can produce a range of colors. It is usually represented by the number of data bits representing the color of each pixel. The so-called bit is the computer's smallest storage unit. The value of the bit is represented by 0 or 1. The more bits, the more complex the image information can be. For example, a true color image often referred to means that each pixel consists of three 8-bit color channels, ie, a 24-bit binary number, and a combination of red, green, and blue channels can generate 2^24=16.67 M (megabytes) of color. The combination of the more colors, the more vivid the scanned image.
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scanning speed scan speed represents a variety of methods, because the scan speed and the resolution, memory, a floppy disk access speed, and the display time, the size of an image, generally designated by the scan resolution and image size Time to express.
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scan format represents the size of the scanning artwork dimensions, and the like are common A4.A3.A0 web.
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