Pre restoration and post processing of the hottest

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Pre restoration and post-processing of scanning color separation technology (Part 2)

v. post art processing

post processing of image scanning color separation, also known as post-processing, refers to the technical processing and artistic processing of unsuitable originals according to impression color and visual effect based on the standardized restoration of electric extensions or scanners and the use of various functions of Photoshop Image processing software, so as to achieve the effect better than the originals. This post-processing technology and art processing should be clear in the guiding ideology, which belongs to the re creation category of scanning color separation technology. In the actual production, there are a large number of unsuitable manuscripts and unreplicated manuscripts. In order to achieve a better effect of image reproduction, it is necessary to carefully carry out technical processing and artistic processing, which is an important part of improving the quality of image printing. The fineness of processing and the appropriateness of artistic processing are one of the standards to measure the quality level of plate making companies and the skill and aesthetic level of operators, This "guidance" regulation is also the artistry of computer plate making technology, which should be treated as an art. The author summarizes the following four contents in production practice, which need careful processing and artistic treatment

1. compensation and adjustment of scanning color separation

first of all, check the settings of gradient setting, color correction and sharpness of scanning color separation, strictly control the scanning color separation, and make compensation and adjustment for some setting errors, so as to make all standard parameters more accurate and restore better

2. Processing and adjustment of unsuitable originals

at present, there are many problems with unsuitable originals, which not only need to be adjusted in a large area, but also complex, mainly including:

(1) adjustment of color density thickness. A. Some originals are overexposed and have weak color density, which requires deepening adjustment; B. Some originals are underexposed and have heavy color density, so they need to be lightened (brightened)

(2) adjustment of gradient contrast. A. Some originals have small density contrast and need to deepen the medium and dark tones and make adjustments to enlarge the contrast; B. Some originals have large density contrast and need to be adjusted for compression and darkening; C. Some manuscripts need to be adjusted in the middle of the depth, which needs to be adjusted in the middle of the shallowness; D. In some originals, the middle tone is shallow and needs to be deepened. Through the above adjustments, the level of the main part of the manuscript is enriched to achieve the best visual brightness

(3) adjustment of gray and old originals. A. Many manuscripts are partially gray and out of date, so it is necessary to adjust the saturation to make the colors bright and bright; B. Many originals have color deviation, which should be corrected

(4) adjustment of defects in the secondary manuscript of traditional Chinese painting. The current remake of the second manuscript of traditional Chinese painting has particularly serious problems and is difficult to process, mainly including: A. uneven lighting, bright in the middle of the picture and dark around, which needs to be adjusted consistently; B. The large blank background of the picture, with rough particles, should be adjusted evenly and delicately; C. The ink color is partial to color, some partial to blue, some partial to red, which should be corrected into neutral gray and black; D. The silk ground color of ancient paintings is either red or yellow, which should be corrected into an antique silk ground color; E. The tone distortion should be adjusted according to the style characteristics of the original work and the painter to make it conform to the tone of the original work

3. make compensation and adjustment for the nonlinear transmission of the printing process tone

because the dot tone is limited by various conditions in the transmission process of plate printing and printing process, the transmission of its tone point is nonlinear. In order to adapt the printing process, compensation adjustment must be carried out. The key point is to adjust the three point jump areas of printing, also known as the three key areas, namely 3%, 50% and 80% point areas. Because 3% dots are easy to lose, which will affect the color level of the highlight area. 50% dots are easy to increase, which will affect the middle tone, especially the change of the skin color of the characters. 80% dots are easy to merge, which will affect the dark tone level, especially the merge of the main color of the dark tone skin color and the deep primary color, which makes it difficult for printing to give consideration to both, and often at a loss. Therefore, for some important colors and important parts of the original, adjust them to avoid these three point jump areas, so as to provide an ideal printing plate for printing, so that it can print well and produce good products. The author deeply understands that an excellent plate maker must understand the printing process and produce a printing plate that conforms to the laws of the printing process according to the printing suitability conditions. Otherwise, there will be no basis for scanning color separation and post-processing, and there will be a lot of blindness

4. do aesthetic and artistic processing on all kinds of originals

in order to produce fine printing products, we should not only consider reproduction, but also pay attention to performance. In order to make the copied image more perfect and better show the characteristics of all kinds of products and the line color of originals, it is also very important to do necessary aesthetic adjustment and artistic processing. At present, most of the requirements for plate making quality are quality aesthetic requirements that leave the basis of the original, that is, regardless of the quality of the original, we should produce pictures that can show the characteristics of various products and the characteristics of the original. Then, do some eye-catching artistic treatment, so as to better reproduce the supreme pen and ink characteristics of Chinese painting; Reproduce the artistic connotation of oil painting and watercolor painting; Reproduce the characteristics and essence of ancient relics; Reproduce the charm of portrait photography art; Reproducing the individuality of architectural art and so on is necessary for making high-quality printing products. Therefore, operators are required to understand the characteristics of various products, correctly analyze and comprehend the characteristics, connotation and artistic style of the manuscript, and adjust and artistic process from the aesthetic point of view, so that the produced version and printed products can achieve the effect of refreshing, clean, clear, delicate, bright light, bright colors and rich levels

(1) for the originals of painting and artistry, the aesthetic processing and artistic processing lies in taking the secondary originals as the basis, emphasizing the original tone as the basis, and try to adjust and process to the tone close to the original, so that the tone is true, natural and coordinated, and can reproduce the original. Continue to do a good job in the production and utilization of new materials demonstration platform, testing and evaluation platform, and build artistic style and characteristics, so as to achieve the due artistic effect on the print screen

at present, this adjustment is difficult, because many secondary originals deviate greatly from the tone of the original, and now the better practice is:

a. many painters are not satisfied with the two originals taken, and require them to personally sit next to the computer, look at the screen color, and guide the operator to adjust the color and tone according to the tone of the original, so as to achieve the effect of the original, although there is still a gap between the screen color and the proofing ink color, But judging from the overall effect of proofreading, most painters are satisfied

b. before making a fine album, some advanced plate making companies first ask painters and art editors to explain the characteristics of their works, the defects of the secondary manuscript and the requirements for plate making quality, so that the operators can know well; The second is to visit the painting exhibition and art exhibition, record the original work and the original color tone, or find the same print or object for reference, so that the operator can find a feeling of the painting and the art, and then do technical processing and artistic processing on the basis of the second original scanning, so as to make it as close as possible to the original work and the original color tone

(2) for photographic originals of timeliness, the aesthetic adjustment lies in focusing on impression color and visual effect, emphasizing the contrast effect of the picture, highlighting the sense of light, emphasizing color saturation, exaggerating and rendering the important colors in the picture, and highlighting the visual impact of color

(3) for the originals of photography art, the aesthetic adjustment lies in making up for some deficiencies in the process of shooting and development, adjusting and handling the relationship between color, light and shadow, light and shade, cold and warm, and space discoloration in photography art, and highlighting the modeling effects of tone, atmosphere, light and shadow, texture and so on. For the best works in this field, please see China photography magazine. It has been unanimously recognized by the National Photography and printing circles as the model of printing quality in high-end periodicals at present, and has recently been rated as the champion of "magazine printing" in the 12th Hong Kong Printing awards. Among many photographic art pictures, first, they have a strong sense of light, bright highlights and strong shadows, giving people a sense of the beauty of light and shadow; Second, it has strong color saturation. From mobile phones to LED lighting - polycarbonate, a high-performance plastic material, is widely used because of its light weight, high transparency, firmness and easy molding. It has bright colors and rich color changes, giving people color art appeal; Third, it has high definition, clear scenery texture, fine particles and rich subtle levels, giving people a sense of reality. Viewing the art pictures in "Chinese photography" gives people visual enjoyment and pleasure, which basically achieves the extreme effect that print media can achieve

to sum up, computer plate making technology is not only scientific and regular in process technology, but also artistic and aesthetic in color processing. Therefore, an excellent operator should not only do a good job in the standardized restoration of early scanning and color separation, but also do a good job in the later aesthetic adjustment and artistic processing. The close combination of the two will produce more and better high-quality pictures

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