Pre-reduction and post-processing of scanning color separation technology (below)

Fifth, post-art processing

The post-processing of image scanning color separation, also called post-processing, refers to the use of various functions of Photoshop image processing software on the basis of standardization and reduction of electrical extensions or scanners, for non-compliant manuscripts, according to impressions and visual effects. The technical processing and artistic processing are carried out to achieve better than the original. This kind of post-technical processing and art processing should be clearly defined in the guiding ideology and belong to the recreative category of scanning color separation technology. In actual production, there are a large number of incompatible manuscripts and manuscripts that cannot be copied. In order to achieve good results in image reproduction, technical processing and artistic processing must be carried out carefully and carefully. This is an important part of improving the quality of image printing. The fineness of its processing and the appropriateness of artistic processing are one of the criteria for measuring the quality level of the plate-making company and the skill level and aesthetic level of the operators. This is also the artistic nature of the computer-platemaking technology and should be treated as an art. In the production practice, the author concludes that the following four items need to be carefully processed and artistically handled.

1. Compensation adjustment for scanning separation

First of all, we must check the settings of the tone settings of the scanning separation, color correction and clarity, strictly control the scanning color separation, and make adjustments to some set errors to make the various standard parameters more accurate. Better sex.

2. Adjustment of non-compliant manuscripts

There are many problems with the current non-conformity manuscripts. Not only do they need to be adjusted, they are also complex. They mainly include:

(1) Thickness adjustment of color density. A. Some of the originals are overexposed, and the color density is light and needs to be deepened; B. Some originals are underexposed, and the color density is heavy, and lightening (lightening) adjustments are required.

(2) adjustment of the contrast of the tone. A. Some originals have low density contrasts and need to deepen the medium and dark tone so as to adjust the contrast; B. Some originals have high contrast and need to be adjusted for compression darkness; C. Some of the manuscripts are deepened in the middle, and adjustments need to be made to reduce the depth of the middle tone; D. Some manuscripts are lightened in the middle and need to be deepened in the midtones. Through the above adjustment, the main body part of the original document is enriched and the best visual brightness is achieved.

(3) Adjustment of dark and old manuscripts. A. Many of the original local colors are gray and old, need to be adjusted to enhance saturation, so that bright colors and bright; B. Many manuscripts are color cast, and adjustments to correct color casts have to be made.

(4) Adjustment of the Chinese manuscript's secondary manuscript defect. The current remake of the Chinese manuscript, the original manuscript, the problem is particularly serious, processing is difficult, mainly: A. The light is uneven, the middle of the screen is bright, and the surroundings are dark. The adjustment needs to be consistent; B. The large blank background of the screen, rough particles, to be adjusted evenly; C. Ink color cast, some blue, some reddish, to correct the neutral gray, black; D. The background color of ancient paintings is either reddish or yellow, and it is necessary to correct the background color of antiques. E. Tones are distorted and adjusted according to the style and characteristics of the artist and the artist to make it consistent with the original tone.

3. Compensation adjustments for non-linear transfer of printing process tones

Because the network tone adjustment is limited by various conditions during the process of printing and printing, the transmission of the tone network is nonlinear. In order to adapt the printing process, compensation adjustments must be made. The key point is to make adjustments to the three outlets of the printing area, which are also called three key areas, namely 3%, 50%, and 80% outlets. Because 3% small points are easy to lose, it will affect the color level of the highlight area, 50% of the dot area will easily increase, affecting the midtones, changes in the color of the special characters, 80% of the dot area will be easy to merge, affecting the tone level, especially It is the dark color of the main color and the deep color of the same level, so that it is difficult to balance the two, often at a loss. Therefore, for some important colors and important parts of manuscripts, they are adjusted so as to avoid these three dot skip areas, thereby providing an ideal printing plate for printing, making it printable, and printing a good product. The author deeply realized that an excellent plate-making staff must understand the printing process, and according to the printability conditions, produce a printing plate that conforms to the rules of the printing process. Otherwise, there will be no basis for scanning color separation and post-processing, and there will be many blindnesses. .

4. Make aesthetic adjustments and artistic treatment of various types of manuscripts

In order to print fine products, we must consider not only the reproduction, but also the performance. In order to make the reproduced image more perfect, the characteristics of various products and the lines of the manuscript can be better expressed. It is also important to make necessary aesthetic adjustments and artistic processing. of. At present, most of the requirements for the quality of plate making are based on the quality aesthetic requirements of leaving the original manuscript, that is, how the quality of the manuscript is determined, and pictures showing the features of various products and manuscript features must be produced. Then, do some eye-catching artistic processing to better reproduce the Chinese characteristics of Chinese paintings; reproduce the artistic connotation of oil paintings and watercolors; reproduce the features and essence of ancient artifacts; reproduce the verve of portrait photography art; This is a must for producing high-quality printing products. Therefore, operators are required to understand the characteristics of various products and correctly analyze and comprehend the characteristics, connotations and artistic styles of the manuscripts. From the aesthetic point of view, adjustments and artistic processing are carried out to make the produced and printed products refreshed. Clean, clear, delicate, bright, colorful, rich layers of effect.

(1) The aesthetic processing and art processing of manuscripts such as paintings and arts is based on the second manuscript, emphasizing the use of the original color tone as the basis, and adjusting the color tone close to the original as much as possible to make the color tone true, natural, and harmonious. Can reproduce the original art style and characteristics, in the print screen to achieve the desired artistic effect.

At present, this adjustment is more difficult because many secondary manuscripts deviate from the original color tone. Now it is better to:

A. Many painters are not satisfied with the two originals. They are asked to sit by the computer and look at the colors of the screen. According to their original color tone, the operator is instructed to adjust the color and tone to achieve the original effect, even though the screen colors are different. There is still a gap in the color of the proofing ink, but most painters are satisfied with the overall results of the school.

B. Prior to the production of a fine picture album, some senior plate-making companies asked the artist and the American editor to explain the characteristics of his work, the defects of the second manuscript, and the requirements for plate-making quality, so that the operator could know what to do; second, visit the exhibition. Art exhibitions, recording originals, original color tones, or finding the same prints or physical objects for reference, enable the operator to find a sense of the painting and the artwork, and then perform technical processing based on the scanning of the second original. Art processing to make it as close as possible to the original, original color.

(2) The esthetic adjustment of photographic manuscripts such as timeliness mainly consists of impressions and visual effects, emphasizing the contrast effect of pictures, highlighting the sense of light, emphasizing color saturation, and exaggerating important colors in pictures. Render processing, highlighting the visual impact of color.

(3) The aesthetic adjustment of the manuscript of the photographic art is to make up for certain deficiencies in the shooting and rinsing process, and to adjust and handle the relationship between color light and shadow, light and shade, light and cold, spatial discoloration in the photographic art, and highlight the tone of photographic images. Atmosphere, light and shadow, texture and other modeling effects. In this respect, please see "China Photography" magazine. It was unanimously considered by the national photography community and the printing industry as a model for the quality of printing in high-end journals. Recently, it was also named the magazine printing champion of the 12th Hong Kong Print Awards. Many of these photographic art images have a strong sense of light, high light, bright and dark tone, giving people the feeling of light and shadow; the second is a strong color saturation, bright color, rich color changes, giving people color art. Infectivity; Third, there is a high degree of clarity, a clear sense of the scene material, fine particles, rich layers, giving a sense of reality. Watch the "Chinese Photography" art picture, give people visual enjoyment and pleasure, basically reached the extreme effect that the print media can achieve.

To sum up, computer-based platemaking technology has both scientific and process-technical rules, as well as aesthetics of art and color processing. Therefore, a good operator must not only do a good job in the normalization of the pre-scan color separation, but also do a good job of aesthetic adjustment and art processing in the later period. The two are closely combined to produce more and better high-quality pictures.