Adjustment of portrait skin color defects Since the news pictures are mostly digital pictures taken by digital cameras, they are subject to conditions such as environment, light, color temperature and the like when capturing and capturing. Whether the color reproduction and the level of integrity are not ideal, there are many defects. Therefore, it is necessary to carry out adjustment processing, whether the skin color of the original with defects such as color cast can be adjusted to meet the skin color desired by people's minds in a limited time, which depends on the level and skill of the coloring personnel. It is important to improve the key aspects of the photo printing of portrait images. In theory, this is a re-creation of print reproduction and an embodiment of the artistic nature of printing technology. Some advanced newspaper printing factories attach great importance to the pre-press coloring process, and set up a number of excellent full-time coloring personnel. At the same time, they strengthen the aesthetic and skill training of the coloring personnel to achieve professional level, as fast and good printing quality. A secret weapon of the picture. 1. Adjustment of color cast Many original portraits have distorted skin color, serious color cast, some are yellowish, some are reddish, and some are grayish. Adjust to match the character's skin tone. If the overall color cast of the original document is used, the overall curve is corrected by the gradation curve or the color correction tool. If the facial skin color is color cast, the face is partially hooked out and corrected separately. 2. Incomplete adjustment of tone Many people like pictures have incomplete tone, some are high-profile, bright, and high-density Donnelley, should be adjusted to bright and bright skin color, should not be gray. Some pictures are low-key, dark, and low in color. You should convert the RGB format to Lab format, use the L-lightness curve to lighten and brighten, and adjust the face of the main character to the best visual brightness range. Some of the larger portraits have a skin tone, and the contrast of light is strong. The highlights are lighter than white paper, and the dark skin tone is a mess. The middle and dark tone should be separately ticked out, and the L channel should be separated by the channel to lighten and lighten the skin tone in the dark tone, and the Y and M color plates of the high-gloss skin color can be printed to the minimum point that can be printed to make it with white paper. Pull the distance apart to get the desired result. According to the printing paper printing tone reproduction range, high-quality printing conditions, on the color separation sheet or CTP printing plate 3% to 90%, the general printing conditions of 5% to 85% of the dots can be transferred evenly to the substrate, to ensure high light 3% to 5% of the small points are not lost, dark adjustments 85% to 90% deep points do not die, to ensure that the tone is complete. 3. Unrealistic adjustment of the outline Many news photos have flaws such as illusory, coarse particles, and large magnification. The solution is as follows. (1) When designing and selecting pictures, editors should try to use high-definition digital pictures or analog photos. Try not to select pictures downloaded from the Internet. If you must select online photo photos, you should choose panoramic, medium-sized photo companies. Because of its small size, it is not easy to expose shortcomings. (2) The pixel value of the digital camera is fixed. It should be changed to the appropriate size after calculating the pixel value, and try not to enlarge the magnification. (3) Some imaginary manuscripts are moderately enhanced by Photoshop's sharpening function layout design. At the same time, in order to compensate for the sharpness of the printing process, it is better to adjust the sharpness to a little over the screen. If the area is larger than the skin color and the particles are thicker, according to the specific problems, select the noise (spot removal, dust and scratch) and fuzzy (Gaussian blur) in the filter to make appropriate adjustments. Effect. The essentials of pink ink to configure skin color At present, pink ink is used in the color printing, which makes it difficult to configure the skin color. Because the color of the pink ink is cold, such as the cold solid pink ink produced by Shanxi Ink Factory, the color is offset by 67.6% book printing, with 19.3% ash and 53.4% ​​efficiency. It shows that the pink ink contains more green components, it is arranged with the yellow color of the skin tone, and the cyan color is composed of light and dark layers. The color changes during printing is large and the control is difficult. E.g: (1) Because the color of pink ink is cold, the proportion of yellow is difficult to grasp. If it is light yellow, it will cause purple and grayish skin; if it is dark, it will cause yellowish skin and orange color. This is the most taboo. The most ugly two skin colors. Even if you don't cyan, it will give people a gray feeling. Therefore, according to the theory of coloring, "adding color and darkening", the principle of processing the complementary color cyan version of skin color is rather less and more, the general rule is that the red version is less than 20%, and cyan is not allowed. The mid-color version of the cyan version is 1/3 or less of the red version. [next] Facial skin color processing method 1. Determine the control point of facial skin color The facial image part of the forehead, cheeks, and chin is the control point of the skin color treatment. Because the forehead is the part of the face that is prominent, it is also the larger part, the muscle is less, the color is stable, because it is prominent, the light is relatively bright, so the law of coloration is slightly yellowish, pale yellow. 2. Adjust the matching parameters of facial skin color First of all, the red version is the main color, because the red version is an important color version of the skin color, and it is a strong color, and yellow is the basic color version of the skin color, which is a weak color. After determining the area ratio of the red version of the dot, the proportion of the yellow version is determined according to the characteristics of the skin color of the person. Generally, the meat color ratio of the forehead is: female skin color is yellow > red 3% ~ 5%, male skin color is yellow > red about 10%, the principle is that in addition to the color of children and Caucasians, the flesh color of the forehead can not be greater than Yellow, if the red is larger than yellow, the face will be stuffy, the brightness is not enough, giving people an uncomfortable feeling. 3. Practice recording several skin color point value matching parameters The dot area ratio matching parameter of the facial skin color. Because the color density of each photo skin is different in color density and light and dark, the specific data is different, but the law of matching can be followed. Using FM network to improve the quality of color picture 　　 In order to further improve the quality of the color picture, the newspaper industry should have a new breakthrough in their ideological concepts, and actively explore, experiment, and apply FM screening technology. When I was working at Chengdu Business News Borui Printing Co., the first one was to use the newly introduced high-end CTP system to give full play to its advanced nature. The second was to use 35-micron FM network technology, first applied in Leshan and Meishan Radio and Television News. The portrait photos are vivid and natural, and the layers are delicate. It eliminates the moiré in the AM screening and eliminates the moiré on clothes and other objects. It gives a particularly comfortable visual effect and is highly praised by customers and readers. . Small newspaper printing, summed up the rules of FM network printing and adjusted the ideal CTP printing compensation curve, and then gradually promoted the application. The author believes that in the current equipment, technology, materials, personnel and other conditions of most newspaper printing companies in China, the use of CTP system, the application of 35 micron FM network is completely feasible, so the printing quality of the picture will be a new Steps. It is not an easy task, but it is an important task that has to be done and has to be improved. As long as the newspaper and printing factory leaders pay attention to it, using modern prepress and printing new technologies, establishing a color management system, strengthening the improvement of employees' aesthetic level and skills training, and mastering the laws of newsprint printing skin color, they will be able to print quickly and well. Produce high-quality portrait skin to enhance the quality of portrait skin color to a new level. 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