The most popular view on the purchase of professio

2022-07-24
  • Detail

From the perspective of software technology, the purchase of professional scanners (Part 1)

editor's note: there are many types of scanners, with a wide range of applications and different scanning environments. Therefore, people have classified scanners from many aspects. From the perspective of shape and volume, common scanners mainly include roller type, platform type and handheld type; From the connection mode with the computer host, there are mainly scanners with USB, SCSI and IEEE1394 interfaces; However, from the perspective of application objects, it is mainly divided into home scanners, office scanners and professional scanners. Among them, the professional scanner, with its novel functions and excellent performance, especially its unparalleled high scanning quality and high scanning speed, has become an indispensable input device in the processing and processing of words, tables, graphics and images in the professional application field. This kind of scanner can not only provide creative post-processing and means for ordinary users in graphics processing and multimedia applications, but also play an important role in professional application fields such as printing, publishing, newspapers, photography, image and web page production

there are many types of scanners, which have a wide range of applications and adapt to different scanning environments. Therefore, people have classified scanners from many aspects. From the perspective of shape and volume, common scanners mainly include roller type, platform type and handheld type; From the connection mode with the computer host, there are mainly scanners with USB, SCSI and IEEE1394 interfaces; 4. Effective stretching space: 600 or 800mm; However, from the perspective of application objects, it is mainly divided into home scanners, office scanners and professional scanners. Among them, the professional scanner, with its novel functions and excellent performance, especially its unparalleled high scanning quality and high scanning speed, has become an indispensable input device in the processing and processing of words, tables, graphics and images in the professional application field. This kind of scanner can not only provide creative post-processing and means for ordinary users in graphics processing and multimedia applications, but also play an important role in professional application fields such as printing, publishing, newspapers, photography, image and web page production

why professional

from the aspect of appearance, the so-called professional scanners basically adopt platform type. From the aspect of performance, the resolution is generally more than 2400dpi, the number of color bits is more than 36, and the scanning speed can complete the scanning of more than 5 pages of photos per minute. The scanning objects are both reflective and transmissive. The scanning format can scan both 35mm color negatives and large format color printing images of more than A3. From the perspective of function, the professional scanner not only has the ability to input large amount of information, but also has the ability to input high-quality images, words and tables, but also has the professional function of inputting some special objects, such as medical special films. That is to say, professional scanners are mainly characterized by their advantages in scanning quality, scanning speed and scanning format, and have the ability to adapt to the special requirements of special professional scanning tasks

professional platform scanner is a traditional scanner with high optical resolution and high scanning speed, which integrates a number of new scanning technologies and processes. The professional platform scanner completes the scanning and imaging through the reflected light on the surface of the manuscript, so it is mostly the reflected manuscript scanning method. Among professional scanners, as the platform scanner has more and more powerful functions, higher performance, smaller volume and weight, higher scanning quality and speed, it can not only complete the traditional reflection scanning, but also can be used to scan the transmission. It can scan small negative color images as small as 35mm, but also wide color printing images. In particular, the performance characteristics of high-speed scanning, high-quantity document scanning and high-quality color scanning are unique for professional applications, so they are widely used in printing, drawing, publishing and other professional fields

professional platform scanners basically use CCD sensors, and their standard optical resolution is generally 1200 × 2400dpi, the color depth (number of colors) is basically more than 36 bits, it only takes a few seconds to scan a color photo, and it is equipped with advanced scanning control technologies such as dynamic range control, intelligent scanning and micro frequency stepping motor, which can not only facilitate the rich level scanning of the transmitted manuscript, but also greatly improve the quality of the scanned image. Some professional scanners are also equipped with direct "scan to Internet" functions such as scanning, fax, copy and e-mail on the scanner panel. Users can use one scanner to complete scanning, fax, e-mail and color copy, and even manage electronic files of documents, so as to reduce excessive dependence on plastic products and raw oil. The scanner has truly become an all-round assistant of the professional office. In order to improve the speed of scanning manuscripts as much as possible, professional scanners are basically equipped with high-speed SCSI interface, and the scanning speed is generally more than 30% higher than that of ordinary scanners

next, we will introduce the structural features, software technology and purchase points of this kind of scanner which plays an important role in the professional application field

where is the "specialty" of professional scanners - hardware article

we often see this phenomenon when purchasing scanners. Many technical parameters, such as scanners with the same scanning format, optical resolution, and color digits, have very large price differences, some even up to dozens of times. At present, in the scanner market, the prices of A4 format, 1200dpi optical resolution, USB interface, 48 bit color scanner 2 and pressure tester are generally below 1000 yuan, but the prices of professional scanners range from yuan to tens of thousands, or even hundreds of thousands. Compared with ordinary household and commercial scanners, what is the difference between professional scanners and where are they

let's first look at how the scanner works. The lamp tube emits light and irradiates it on the reflected manuscript on the scanner glass plate. According to the different brightness and darkness of the manuscript in different places, the reflected light with different intensity is formed. Then it focuses on the CCD at the other end of the lens through a series of mirrors. The CCD converts the optical signal into the corresponding electrical signal, that is, the analog signal. These signals are finally converted into the digital signal that can be recognized by the computer through the a/d converter, Then it is transmitted to the computer through different interfaces. The whole scanning process involves optical, mechanical, electronic and other aspects. The design of any component will affect the final digital results

the structure of professional scanners is basically the same as that of home and office scanners, but the components and technologies used are very different

lamp tube

first let's take a look at the lamp tube. For the scanner, the light source is very important, because all the light felt on the CCD comes from the lamp tube of the scanner itself. Impure light source or color deviation will directly affect the scanning results. At noon, we look at a piece of white paper with our naked eyes. What we see is white. But after dusk, under the action of golden sunshine, the same piece of white paper will show golden yellow. When the light source changes, the results we see are naturally different

the professional scanner will automatically detect the light intensity emitted by the lamp before scanning. Especially when the scanner is just started, because the lamp does not enter a stable state, the scanner has a certain preheating time. Only when the light intensity is enough to meet the standard, the light source in the machine will send a pass command to the detection sensor in this study. At this time, the scanner can scan in the best working state. Ordinary home and office scanners basically do not have self-test procedures. The light emitted by some scanner tubes is not even harsh to the eye. Such light intensity is naturally insufficient to show the dark details in the original

reflector

the light emitted from the lamp shines on the reflector and is reflected into a series of reflectors inside the scanner. These mirrors play a vital role in the scanner. We know that when the light shines on a surface, diffuse reflection will occur (Fig. 2). Since it is impossible to create an absolute plane, there will be more or less loss when the light shines on the mirror. The higher the flatness of the mirror, the less light will be lost. Professional scanners, in order to minimize this interference, have done special black spraying before and after the lens, and even used the same paint as the camera darkroom material. However, in recent years, various manufacturers have applied this technology to ordinary household and commercial scanners

Copyright © 2011 JIN SHI