Color platform scanners have been widely used in color desktop publishing systems and professional advertising design industries, and have played a positive role in promoting color image processing. However, how can we get truly high-quality scanned images? There are many factors that affect the quality of image scanning. Resolution settings, color correction, image enhancement, file formats, file storage, and system resources are all involved. In fact, even if the above problems are solved, you will not be able to sit back and relax and you must be perfect. There is no need to scan the image and you need to check the quality of the scanned image. Most users often ignore this.
Checking the quality of the scanned image needs to start with three aspects: image color scale range, image color, and image brightness.
Image range
For many novice users, checking image quality often means checking the color of the image and thinking that good color is equivalent to a good image. In fact, this is just one aspect of the problem. The most critical factor in looking at an image is to check its color scale range, which is the level of the image. The so-called level is the degree of change from dark to light shades in the image. Check the image level using professional tools, such as image processing software provided by the manufacturer Photoshop, ImagePais 2, the suction tool in these software can check the image level, especially for high light areas and dark areas. If the highlights and shadows appear with large numbers of white or black of the same value, or the magnitude of the value change is very small, it means that the image level is poor. Using the "Level function" in Photoshop, you can check the quality of the image from the color distribution map. If there are a large number of dark pixels on the left, it indicates that the entire image is dark; if there are a large number of bright pixels on the right, it indicates that The entire image is bright; if the scanned image is in good quality, the image is clearly structured and the color distribution map is even. In addition, Photoshop's "Histogram function" can also help users check the status of the scanned image to see if the continuous level transitions from bright to dark and smooth, or shows a band gap, if there is a clear band gap, The user-selected scanner density is low and should be adjusted accordingly.
The MICROTEK Artixscan 4000t scanner currently on the market has an automatic mediation function that can automatically sharpen the image and includes the following functions: setting the intensity of sharpening processing, setting the width of the processing range, setting the adjacent Differences in the order of the two-pixel color gradations require sharpening. With the advanced image processing functions described above, the Artixscan 4000t scans the resulting image to accurately reproduce the dark and highlight details, particularly in the details.
Check image color
When the image has enough levels, check whether the color of the image is balanced, that is, whether the image has color cast or not. The easiest way to check the color balance is to check neutral gray. Gray balance is the gradual change from the smallest black (0%) to the largest white (100%) in the image, and is one of the important parameters for converting from RGB to CMYK. In theory, mixing equal amounts of C, M, and Y inks will produce neutral ash, but in fact, due to the difference in ink quality, it will cause a certain percentage of deviations, only a specific proportion. In order to achieve neutral gray. The user can determine the correct CMYK value from the Printing Inks Setup function in Photoshop. The easiest way to check the color is to open the Info panel in Photoshop and move the cursor to the brightest highlight and darkest tone in the image. Note the data displayed in the Info panel, if the highlight and low-key areas are read. The RGB value is between 250 and 5, which means that the tonal range of the scanned image has enough detail and the image quality is very good. In addition, it is also necessary to check the image's impression of color, such as the color of the sky, grass and flowers, and whether they are harmonized. However, most of them require human judgment and lack of scientific nature. Because the judgment of color is a complex visual and psychological process, and each person's aesthetic point of view and personality are different, they will have a particular preference for certain colors. Therefore, this method can only be used as a reference method for checking colors.
Check image brightness
It is also very important to check the brightness of the image. By comparing it with the original, it is impossible to obtain the ideal image if the scanned image is too dark or too bright, too dark or too bright. Brightening an image that is too dark, adjusting the gamma value is definitely a convenient method, but doing so can cause the scanned image to lose information. In fact, the easiest way to check the brightness of an image is to compare the color value on the scanned image in CYMK mode to see if it is close to the original.
In fact, the scanning process has always been simple, but to obtain high-quality scanned images, there are too many variables, because the color desktop system itself is open. Combining the experience of using the scanner for a long time, the author believes that to obtain a perfect scanned image, the quality control of the scanned image is very important, and serious achievement of the above points is undoubtedly an important factor for obtaining perfect output.
Checking the quality of the scanned image needs to start with three aspects: image color scale range, image color, and image brightness.
Image range
For many novice users, checking image quality often means checking the color of the image and thinking that good color is equivalent to a good image. In fact, this is just one aspect of the problem. The most critical factor in looking at an image is to check its color scale range, which is the level of the image. The so-called level is the degree of change from dark to light shades in the image. Check the image level using professional tools, such as image processing software provided by the manufacturer Photoshop, ImagePais 2, the suction tool in these software can check the image level, especially for high light areas and dark areas. If the highlights and shadows appear with large numbers of white or black of the same value, or the magnitude of the value change is very small, it means that the image level is poor. Using the "Level function" in Photoshop, you can check the quality of the image from the color distribution map. If there are a large number of dark pixels on the left, it indicates that the entire image is dark; if there are a large number of bright pixels on the right, it indicates that The entire image is bright; if the scanned image is in good quality, the image is clearly structured and the color distribution map is even. In addition, Photoshop's "Histogram function" can also help users check the status of the scanned image to see if the continuous level transitions from bright to dark and smooth, or shows a band gap, if there is a clear band gap, The user-selected scanner density is low and should be adjusted accordingly.
The MICROTEK Artixscan 4000t scanner currently on the market has an automatic mediation function that can automatically sharpen the image and includes the following functions: setting the intensity of sharpening processing, setting the width of the processing range, setting the adjacent Differences in the order of the two-pixel color gradations require sharpening. With the advanced image processing functions described above, the Artixscan 4000t scans the resulting image to accurately reproduce the dark and highlight details, particularly in the details.
Check image color
When the image has enough levels, check whether the color of the image is balanced, that is, whether the image has color cast or not. The easiest way to check the color balance is to check neutral gray. Gray balance is the gradual change from the smallest black (0%) to the largest white (100%) in the image, and is one of the important parameters for converting from RGB to CMYK. In theory, mixing equal amounts of C, M, and Y inks will produce neutral ash, but in fact, due to the difference in ink quality, it will cause a certain percentage of deviations, only a specific proportion. In order to achieve neutral gray. The user can determine the correct CMYK value from the Printing Inks Setup function in Photoshop. The easiest way to check the color is to open the Info panel in Photoshop and move the cursor to the brightest highlight and darkest tone in the image. Note the data displayed in the Info panel, if the highlight and low-key areas are read. The RGB value is between 250 and 5, which means that the tonal range of the scanned image has enough detail and the image quality is very good. In addition, it is also necessary to check the image's impression of color, such as the color of the sky, grass and flowers, and whether they are harmonized. However, most of them require human judgment and lack of scientific nature. Because the judgment of color is a complex visual and psychological process, and each person's aesthetic point of view and personality are different, they will have a particular preference for certain colors. Therefore, this method can only be used as a reference method for checking colors.
Check image brightness
It is also very important to check the brightness of the image. By comparing it with the original, it is impossible to obtain the ideal image if the scanned image is too dark or too bright, too dark or too bright. Brightening an image that is too dark, adjusting the gamma value is definitely a convenient method, but doing so can cause the scanned image to lose information. In fact, the easiest way to check the brightness of an image is to compare the color value on the scanned image in CYMK mode to see if it is close to the original.
In fact, the scanning process has always been simple, but to obtain high-quality scanned images, there are too many variables, because the color desktop system itself is open. Combining the experience of using the scanner for a long time, the author believes that to obtain a perfect scanned image, the quality control of the scanned image is very important, and serious achievement of the above points is undoubtedly an important factor for obtaining perfect output.
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