With the continuous improvement of the technical performance of flatbed scanners and their advantages in price, users of flatbed scanners are increasingly used in color desktop systems. In order to meet the needs of the majority of users, in recent years, flatbed scanners have been divided into professional and ordinary types according to different grades, specifications and uses. Understanding the various functions of the flatbed scanner can enable the operator to successfully scan images of better quality. The following is only a brief view of the main functions and operating points of the flatbed scanner. 1. Selection of scanning method The scanning method of the plane scanner can be divided into automatic and manual. These two different scanning methods will have different effects on the image quality. 1. Automatic scanning Automatic scanning refers to the "AI" function, also known as the "fool" function. When the automatic mode is selected for scanning, the scanner will scan the image for the first time to identify the pixel distribution and the highest density and lowest density, so as to adjust the signals output by R, G, B after processing by the computer, and then Formal scan. For this reason, when scanning in this state, you should be careful not to select the content outside the screen into the scanning format when setting the scanning range. If the white border, black border or cover outside the screen is also selected within the set scanning range, the screen already contains information content that does not belong to the original. The automatic scanning software will make an incorrect judgment on the original information and cause the scanned image. The main feature of the automatic scanning software is to automatically find the black and white fields and calculate the contrast under the premise of the correct neutral gray balance setting. Able to achieve replication restore. Therefore, when using the automatic scanning function, it should be noted whether the original has a color cast and whether the contrast is appropriate. Otherwise, when using the automatic function to scan the image, the image quality will not reach the ideal state. 2. Manual scan In most cases, we need to use manual scanning. This method can effectively adjust the color shift, contrast and curve state of the original, so that it can better express the level of a certain part of the original. When performing a manual status scan, a series of dialog boxes will appear, which need to be set for each scan. Common scanners generally have the following settings. (1) Setting of highlight and dark tone The setting of highlight and dark tone is also called the setting of white field and black field. According to the different scanning software set by the scanner, it can be roughly divided into the following three situations: black and white field in the state of printing dot C, M, Y, K Calibration; set the black and white fields in the brightness level appearing in the form of RGB, generally set the white field between 170 and 255, and the black field between 0 and 85; appear in the form of original density, and set the lowest and highest density of the original when setting To calibrate the white and black fields, some scanners are expressed in digital levels in the form of bright and dark tones. In the above highlight and dark tone settings, the printed dot RGB format is used for calibration. You can adjust the color cast and contrast of the original document to a large extent; when scanning at the maximum and minimum density, the contrast will be adjusted on the basis of ensuring the restoration of the color tone of the original document. (2) Setting of Curve and Gamma values The state of the curve and the setting of the gamma curve will relate to the gradation performance after the image is scanned. Due to the difference in density contrast between the transmissive manuscript, the reflective mantle, and the printed matter, all levels on the manuscript must be copied on the printed matter, so that bright tones, midtones, and dark tones are fully reflected on the paper. Adjust the curve status. Because most of the software of the plane scanner can not only adjust the curve as a whole, but also adjust the individual curve state in the form of ruler R, G, B respectively. In this way, we can trim the neutral gray balance of the ink, and also handle the overall color cast of the original. 2. Scanning settings for printed manuscripts The top setting is generally divided into four tops: 85 lpi (newsprint), 133 lpi (magazine), 150 lpi (general), and 175 lpi (sample). Since the printed product is composed of dots, the re-copying is based on the dots of the original dots, and an interference pattern will be generated at this time. When printing an image with an interference pattern, an irregular pattern will be formed on the hue per unit area, so that it will produce a lattice pattern on the printed product, commonly known as "turtle pattern". This setting of the flatbed scanner. In fact, the scanning focal length is adjusted so that the scanner cannot distinguish the dots of the printed product. Therefore, when this item is set, the sharpness of its image will be affected to a certain extent. Among them, the thickest dot of 85lpi has the largest adjustment range, and its image is correspondingly blurred. The finest dot of 175lpi has the smallest adjustment range. Therefore, when it is impossible to determine the printing screen line of the printed manuscript, in order to maintain the sharpness of the image as much as possible, you should start scanning by selecting a finer screen line setting until no "craze" appears. 3. Sharpness setting It should be pointed out here that sharpness is not equal to sharpness. Although the increase in sharpness improves clarity in visual effects. But on the other hand, excessively increasing the sharpness will make the image rough, especially when taking photos and prints with coarser silver salt particles. In a flat scanner. The sharpness of the image is determined by the optical resolution of the scanner; the sharpness is a white border and a black border in the area between high and low density. Make it improve the clarity in visual effects. For such a computer-generated line, it will be determined by three factors, namely depth (Amount), range (Radius) and threshold (Threshold). Some scanning software divides sharpness into light, medium, and emphasized levels. In general, reversal film can choose a slightly higher sharpness, photos can choose a medium sharpness, prints can choose a slight sharpness. In addition, the sharpness of manuscript content, such as still life and landscape, can be slightly higher. For characters, you can choose a lower tax setting. Fourth, the image resolution setting The setting of the image resolution should be determined by the network cable of the final output film. In general, the image resolution should be set to twice the output network cable. For example: output 150lpi, the image resolution should be 300dpi; output 175lpi, the image resolution will of course increase accordingly. Set the resolution higher. The corresponding level of reflection may be better, but the amount of files will also increase, which greatly reduces the speed of file scanning, transmission and production. On the contrary, images with too low resolution will greatly reduce the content contained. Although the amount of files is reduced and the speed of file transmission and production is improved, the output of the film will be in the image part because the image resolution cannot be matched with the output accuracy of the film. There is a mosaic phenomenon. When performing line scanning, set the image resolution as normal. There will be a lot of sawtooth at the corners and diagonal lines. Bring a lot of trouble to post-production. When the image resolution is increased to 1200dpi, the aliasing phenomenon will be greatly reduced. Of course, when increasing the image resolution, the scanning speed will be reduced due to the increase in the amount of files. But after scanning, in order not to affect the transmission and production speed of the file, the resolution of the file can be reduced to a normal state. The operation of each flatbed scanner is different, but their basic operations are generally consistent. The operator needs to fully understand the main operating functions, adjustment ranges and performance capabilities, as well as an understanding of the printing process and knowledge, and be familiar with the color forming laws of C, M, Y, and K. In this way, the image quality can be better achieved to a satisfactory level.
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