How to use the scanner's original correction function to process pictures (2)

These dots are acceptable to the naked eye, but they are a non-negligible problem for the scanner because the scanner scans the printed photos and scans them to affect the quality of the image. The de-networking technique can be used to analyze the images of the outlets and restore them to originals without dots to reproduce the original picture. Scanners generally have several options for us to choose. When the original image is a magazine or a laminated print, please select “magazine”; when the original image is a newspaper or a relatively coarse dot print, please select “newspaper”; when the original image is a high-quality fine print and the outlets are very small, Please select "art print". It should be noted that if you are scanning non-printing materials, you must select "Do not set" and do not turn this feature on because it will reduce the quality of the scanned image.
By modifying the scanning parameters, it is possible to make up for some deficiencies of the original image during scanning, and appropriately improve the scanning effect, but the effect is always limited. The best way to get the ideal scan is to choose a good picture.

VI. Pictures downloaded from the Internet

Since most pictures downloaded on the Internet are in RGB mode and the color range of RGB mode is larger than CMYK mode, in order to ensure the printing effect of images, it is better to use RGB mode for processing, and finally convert to CMYK mode. When editing images in RGB mode in Photoshop, select the CMYK preview option in the View menu. That is, edit images in RGB mode and display images in CMYK mode. Most of the downloaded images are small in size due to their display size. When we want to make images needed by newspapers, the images will become unclear. If there is a mosaic, it is even more important to note that when sharpening, it is not possible to sharpen too much. If the original image is a color image but is to be used in a grayscale layout, do not edit the original image directly to grayscale mode when processing. The RGB mode should be used for processing. The processed image is first converted into an L*a*b* mode image, and then the L* channel image is selected as a grayscale image for printing through the channel separation command. Note that do not convert between the RGB and CMYK modes, not to transfer the two modes, because in the bitmap image editing software, every time the image color space conversion, will lose part of the original image details information.

Note on the processing of newsprint printed images: In order to make the colors bright and appropriate to aggravate the main colors, reduce or not use the opposite colors appropriately; properly leave off the dark tone to protect the medium and bright tone; the figures of the black and white image of the character cannot be too high. To avoid being too dark, bright tone should be enough to do enough.

In short, for the scanning and production of images in prepress systems, they all have deep knowledge and experience. Therefore, the operator of the prepress system must be able to grasp the various techniques of image processing, enhance their own aesthetics, accurately determine the quality of the picture, and really get a good picture printing effect, or do not be afraid of trouble, carefully and carefully adjust, and strive to achieve The processed image has a higher quality than the original.