Most operators use the scanner to scan only the options such as resolution and zoom ratio, with the rest default settings. Practice has proved that this does not achieve the best scanning results. Especially when the original image is defective, the scan result is even less ideal. When scanning a defective image, how can I get the best performance of the scanner and scan out higher quality images? This requires careful analysis of the original and makes full use of some of the original correction functions provided by the scanner to carefully adjust the scanner's preset values.
First, the picture is not accurate
Adjust the brightness and contrast when scanning. Overexposed pictures look white because they are too bright. Underexposed pictures look dark because they are too low. At the same time, the images are lacking in layers and the details are not rich. At this point we can drag the slider on the brightness and contrast sliders to make the image brightness and contrast. Since the adjustment of brightness and contrast is effective for all pixels in the image, care should be taken not to lose sight of it. For example, the main information of the image is in a darker area, making it brighter to make the details more visible. However, when the brightness adjustment function is used to brighten all areas, all the details in the area with higher brightness are lost.
Second, the color of the picture
To adjust the color balance when scanning, if the image is somewhat color cast, you can use the color balance option to change the overall tone of the image. When the color cast is not serious, you can select the “Auto Color Balance†option to let the software automatically correct; if the color cast is serious, you need to make manual adjustment. The color of the scanner is mainly a mixture of red, green and blue. The scanner provides adjustment functions for each of the three basic colors. The adjustment options include three sliders: red, green, and blue. To adjust the color of the image, simply drag the slider on the slider to the color you want to add to the image, or drag the slider away from the color you want to reduce. Color adjustment requires some knowledge of color, especially the principle of complementary color: the two colors in relative position on the color wheel are called a pair of complementary colors, such as red and cyan, green and magenta, blue and yellow. Complementary colors. The so-called complementarity is that the reduction of one color in an image inevitably leads to an increase in its complementary color, and it is absolutely impossible to have a color and its complementary color increase or decrease at the same time.
Third, the lack of layers of pictures
The gamma value is adjusted during scanning, and the gamma value affects the hue of the intermediate value of the graphic or the gray level of the intermediate level. By adjusting the gamma value, you can change the brightness value of the image's midtone grayscale to increase the intermediate level of the image without affecting the dark and bright levels. Entering a number greater than one will expand the range of midtones, which will result in a smaller contrast and more detail in a large proportion of intermediate tones. Entering a smaller number than one will narrow the range of midtones, which will increase the contrast of the image and reduce the detail of the image. As the curve moves down, the corresponding pixels of the image become darker; when moved up, the corresponding pixels become brighter. Its adjustment often needs to work together with brightness and contrast to achieve satisfactory results. [next]
Fourth, the picture is not ideal
When scanning, it is necessary to make a reasonable cut, and the picture with improper framing often has a messy background, the theme is not prominent, or the scene is skewed, and the visual effect is poor. During scanning, the original image can be selected by selecting the scanning range as needed, and the skewed image can be corrected for artistic re-creation. To do this, select "Scan Size" in the Scan Settings option as "User-defined" mode, and then use the drag marquee in the preview image window to select the area to be scanned. The method is: hold down the left mouse button at the corner of the area to be scanned, drag the selection box to the opposite corner of the scanning area, and release the left button. In this way, the scanner will automatically scan only the selected area. For images that are skewed by the scene, just use the "Rotate" function to correct.
Five, printed pictures
The screen removal function is used for scanning, and the printing field uses the screen printing technology, which relies on countless small dots to express the brightness of the image. These small dots are acceptable to the naked eye, but they are a problem that cannot be ignored for scanners because the scanner scans the printed photos and scans them into small dots, affecting the quality of the image. The de-networking technology can reproduce the original image by analyzing the image with the dot and reducing it to an original without a dot. Scanners generally have several options for us to choose from. When the original picture is a magazine or a film print, please select "Magazine"; when the original picture is a newspaper or a rough print, please select "Newspaper"; when the original picture is high-quality fine print, the outlet is very small, Please select "art prints". It should be noted that if you scan non-printed products, you should select “Do not set†and do not turn this function on, as this will reduce the quality of the scanned image.
By modifying the scanning parameters, it can make up for some shortcomings of the original image during scanning, and properly improve the scanning effect, but the effect is always limited. The best way to get the best results is to choose a good picture.
Sixth, pictures downloaded from the Internet
Since the pictures downloaded on the Internet are mostly in RGB mode, and the color range of the RGB mode is larger than the CMYK mode, in order to ensure the printing effect of the image, it is better to use the RGB mode for processing, and finally to convert to the CMYK mode. When editing an image in RGB mode in photoshop, select the CMYK preview option in the View menu. That is, the image is edited in RGB mode and the image is displayed in CMYK mode. Download images are small due to the large size of the display. And when we want to make an image that the newspaper needs, the image becomes less clear. If you have a mosaic, you should pay more attention to it. When sharpening, you should not sharpen it too much. If you want to do it, blur it and then sharpen it. If the original image is a color image, but is to be used in a grayscale layout, do not edit the original image directly into grayscale mode while processing. It should be processed in RGB mode, and the processed image is first converted into an image of L*a*b* mode, and then the image of the L* channel is selected as a grayscale image for printing by the channel separation command. Note that do not convert between RGB and CMYK modes, and don't transfer the two modes. Because in bitmap image editing software, each time the image color space is converted, some of the original image details will be lost. information.
Note on the processing of the image printed on newsprint: In order to make the color brighter, the main color should be appropriately emphasized, and the opposite color should be appropriately reduced or reduced; the dark adjustment and the bright tone should be appropriately discarded; the face value of the black and white image of the character should not be too high. So as not to be too dark, the bright tone should be enough to do enough.
In short, there is deep knowledge and experience in the scanning and production of images in prepress systems. Therefore, the operators of the prepress system must be able to master the various techniques of image processing, improve their aesthetics, accurately judge the quality of the pictures, and really get good picture printing effects. Don't be afraid of trouble, carefully adjust and strive to achieve The processed image has a higher quality than the original. (Author: Qingdao Daily Newspaper Group)
Most operators use the scanner to scan only the options such as resolution and zoom ratio, with the rest default settings. Practice has proved that this does not achieve the best scanning results. Especially when the original image is defective, the scan result is even less ideal. When scanning a defective image, how can I get the best performance of the scanner and scan out higher quality images? This requires careful analysis of the original and makes full use of some of the original correction functions provided by the scanner to carefully adjust the scanner's preset values.
First, the picture is not accurate
Adjust the brightness and contrast when scanning. Overexposed pictures look white because they are too bright. Underexposed pictures look dark because they are too low. At the same time, the images are lacking in layers and the details are not rich. At this point we can drag the slider on the brightness and contrast sliders to make the image brightness and contrast. Since the adjustment of brightness and contrast is effective for all pixels in the image, care should be taken not to lose sight of it. For example, the main information of the image is in a darker area, making it brighter to make the details more visible. However, when the brightness adjustment function is used to brighten all areas, all the details in the area with higher brightness are lost.
Second, the color of the picture
To adjust the color balance when scanning, if the image is somewhat color cast, you can use the color balance option to change the overall tone of the image. When the color cast is not serious, you can select the “Auto Color Balance†option to let the software automatically correct; if the color cast is serious, you need to make manual adjustment. The color of the scanner is mainly a mixture of red, green and blue. The scanner provides adjustment functions for each of the three basic colors. The adjustment options include three sliders: red, green, and blue. To adjust the color of the image, simply drag the slider on the slider to the color you want to add to the image, or drag the slider away from the color you want to reduce. Color adjustment requires some knowledge of color, especially the principle of complementary color: the two colors in relative position on the color wheel are called a pair of complementary colors, such as red and cyan, green and magenta, blue and yellow. Complementary colors. The so-called complementarity is that the reduction of one color in an image inevitably leads to an increase in its complementary color, and it is absolutely impossible to have a color and its complementary color increase or decrease at the same time.
Third, the lack of layers of pictures
The gamma value is adjusted during scanning, and the gamma value affects the hue of the intermediate value of the graphic or the gray level of the intermediate level. By adjusting the gamma value, you can change the brightness value of the image's midtone grayscale to increase the intermediate level of the image without affecting the dark and bright levels. Entering a number greater than one will expand the range of midtones, which will result in a smaller contrast and more detail in a large proportion of intermediate tones. Entering a smaller number than one will narrow the range of midtones, which will increase the contrast of the image and reduce the detail of the image. As the curve moves down, the corresponding pixels of the image become darker; when moved up, the corresponding pixels become brighter. Its adjustment often needs to work together with brightness and contrast to achieve satisfactory results. [next]
Fourth, the picture is not ideal
When scanning, it is necessary to make a reasonable cut, and the picture with improper framing often has a messy background, the theme is not prominent, or the scene is skewed, and the visual effect is poor. During scanning, the original image can be selected by selecting the scanning range as needed, and the skewed image can be corrected for artistic re-creation. To do this, select "Scan Size" in the Scan Settings option as "User-defined" mode, and then use the drag marquee in the preview image window to select the area to be scanned. The method is: hold down the left mouse button at the corner of the area to be scanned, drag the selection box to the opposite corner of the scanning area, and release the left button. In this way, the scanner will automatically scan only the selected area. For images that are skewed by the scene, just use the "Rotate" function to correct.
Five, printed pictures
The screen removal function is used for scanning, and the printing field uses the screen printing technology, which relies on countless small dots to express the brightness of the image. These small dots are acceptable to the naked eye, but they are a problem that cannot be ignored for scanners because the scanner scans the printed photos and scans them into small dots, affecting the quality of the image. The de-networking technology can reproduce the original image by analyzing the image with the dot and reducing it to an original without a dot. Scanners generally have several options for us to choose from. When the original picture is a magazine or a film print, please select "Magazine"; when the original picture is a newspaper or a rough print, please select "Newspaper"; when the original picture is high-quality fine print, the outlet is very small, Please select "art prints". It should be noted that if you scan non-printed products, you should select “Do not set†and do not turn this function on, as this will reduce the quality of the scanned image.
By modifying the scanning parameters, it can make up for some shortcomings of the original image during scanning, and properly improve the scanning effect, but the effect is always limited. The best way to get the best results is to choose a good picture.
Sixth, pictures downloaded from the Internet
Since the pictures downloaded on the Internet are mostly in RGB mode, and the color range of the RGB mode is larger than the CMYK mode, in order to ensure the printing effect of the image, it is better to use the RGB mode for processing, and finally to convert to the CMYK mode. When editing an image in RGB mode in photoshop, select the CMYK preview option in the View menu. That is, the image is edited in RGB mode and the image is displayed in CMYK mode. Download images are small due to the large size of the display. And when we want to make an image that the newspaper needs, the image becomes less clear. If you have a mosaic, you should pay more attention to it. When sharpening, you should not sharpen it too much. If you want to do it, blur it and then sharpen it. If the original image is a color image, but is to be used in a grayscale layout, do not edit the original image directly into grayscale mode while processing. It should be processed in RGB mode, and the processed image is first converted into an image of L*a*b* mode, and then the image of the L* channel is selected as a grayscale image for printing by the channel separation command. Note that do not convert between RGB and CMYK modes, and don't transfer the two modes. Because in bitmap image editing software, each time the image color space is converted, some of the original image details will be lost. information.
Note on the processing of the image printed on newsprint: In order to make the color brighter, the main color should be appropriately emphasized, and the opposite color should be appropriately reduced or reduced; the dark adjustment and the bright tone should be appropriately discarded; the face value of the black and white image of the character should not be too high. So as not to be too dark, the bright tone should be enough to do enough.
In short, there is deep knowledge and experience in the scanning and production of images in prepress systems. Therefore, the operators of the prepress system must be able to master the various techniques of image processing, improve their aesthetics, accurately judge the quality of the pictures, and really get good picture printing effects. Don't be afraid of trouble, carefully adjust and strive to achieve The processed image has a higher quality than the original. (Author: Qingdao Daily Newspaper Group)
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