The most popular gravure image color processing te

2022-08-02
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Technical methods and essentials of gravure image color processing (III)

6. color processing. Color processing is the key to the success or failure of gravure color image reproduction. Because the current screen color and gravure proofing color can not do "what you see is what you get", there is a big gap in some color gamut systems, such as cyan and blue. Therefore, in color processing, the screen color shall not prevail. Instead, the color displayed on the eopp film by the inks with different characteristics such as inner printing ink, surface printing ink, or Tianlan ink and peach ink used for gravure printing shall be used as the basis, and the chromatogram and screen color printed by the company shall be used as the reference. The color shall be mainly configured based on the point value data. We should sum up bit by bit in production practice, accumulate experience, find out which color gamut has what error law, and then make compensation in color matching

standards for color processing: (1) first, master the principle of true color, that is, to achieve accuracy compared with the actual color; (2) However, because the extruded polystyrene board product itself is a combustible material, every effort is made to make the digital proofing color after color matching catch up with the customer's color proofing color, and the gravure ink proofing color after electronic engraving catch up with the digital proofing color. The accuracy of color restoration of the two products reaches 95%~98%, and some color ranges are even better than the color proofing; (3) Try to meet the color requirements of people or customers. We should not only be loyal to the original color of the commodity, but also meet the requirements of people's hearts for color, so as to achieve the commercial effect of color

two points should be paid attention to when adjusting the color with the selected color calibration tool of Photoshop software: (1) the primary colors y, m, C should be adjusted first, and the secondary colors R, G, B should be adjusted after; (2) Do not use the color calibration tool to adjust the multicolor, because the multicolor belongs to the gray system. If you use the color calibration tool to adjust the multicolor, the amount of CO calibration is large and the effect of color calibration is small. Excessive color calibration will seriously affect the change of the color system. If it is to be used, the multicolor to be adjusted shall be separately checked out and adjusted with a lasso tool

7. artistic treatment. Artistic re creation processing and fine processing are necessary for making high-quality gravure printing products. If they are not superior to the original, and do not meet the artistic processing and fine processing of people's psychological color, they can not cause emotional resonance between buyers and product manufacturers, which is not a good plate making and printing quality. Therefore, in order to better express the color characteristics of various commodity objects, on the one hand, we should integrate the subjective visual psychological color into the operator's adjustment design, and artistically deal with the important colors of the picture, that is, appropriately exaggerate the rendering, highlight the psychological effect of the color, and make it conform to the visual real effect perceived by the human eye; On the other hand, we should not simply adjust the color saturation, but sublimate to correctly deal with the normal proportional relationship, light and dark relationship, and cold and warm relationship of colors according to the color configuration principle, and highlight the three-dimensional, spatial, and light and light sense of the physical form; In three aspects, we should carefully repair the defects of the original, such as particles, traces, dirty spots and unevenness, so as to achieve a clean, bright, delicate, refreshing and pleasant effect of the product, so that people will have a desire to buy when they see the beautiful and real picture color. This requires operators to have a higher judgment vision, understand the objective object color, and master the color configuration law

the author has made many high-quality products through careful artistic re creation and fine technical processing in some plate making companies according to the above three aspects, which has not only been highly praised by many domestic customers and art designers. After reading the digital proofing and gravure printing samples, they believe that they are the best products in the current gravure printing commodity packaging products, just like the envisaged effect. Moreover, it has been praised by some foreign customers in the United States, Japan and so on, and believes that it can be comparable with their similar products. At the same time, these products are all successful in gravure proofing, which is really good and fast

IV. methods and essentials of color processing

in the final analysis, the plate making and printing process of gravure commodity color packaging products is the color reproduction process, and the most fundamental one is whether the image color processing technology of the plate making company is excellent, whether it can bring out the image colors that customers are satisfied with, and more than customers expect. Because the customer first looks at whether the image color is well made, whether it is bright or not, whether the color is like or not compared with the color manuscript, and whether it is consistent with the color he hopes to judge the quality of plate making. At the same time, in packaging art, there is often a saying that "look at the color from a distance and look at the flowers from a distance, look at the color first and then the flowers, and divide the color into three parts", which fully shows how important it is to deal with the color of packaging products. Therefore, from the commercial point of view of practical application, the point of view that Ao xuhuacheng project is located in Changshu new material industrial park, and the point of view that it meets people's psychological color requirements, color processing should be carried out according to the principle of color configuration and the law of concave printing art in combination with the color characteristics of commodity packaging products. Overcome the current many operators just look at the screen color random, blind color matching, sometimes the lemon color into orange, resulting in repeated rework. Therefore, it is important to master the 10 methods and essentials of color processing

1. treatment of color saturation. How to match the saturation is an important part of color processing, because customers require their products to be saturated with bright colors, and even need to warm up for 10 minutes to achieve excessive process startup. In fact, on the basis of equal compression of various colors or loss of one part of colors during processing, the color of another part can be strengthened, and sometimes the saturation of all colors can be balanced. The best processing should be based on the original content and the main color, and the following essentials should be mastered:

① the depth of basic primary color should be sufficient

various field colors, such as red, green, blue and other field characters, logo and other patterns, and basic colors that do not need to be layered, are sufficient. General customers require these logo colors to be thick, thick and bright. Therefore, it is necessary to do 100% on-the-spot printing to give full play to the extreme effect of the maximum on-the-spot density of gravure printing ink. It is not enough to make it 90% or 95%. Although 90% or 95% of the dots will be expanded to 100% after printing, this is different from the effect of 100% on-the-spot printing. The density of 90% of the dots reaches the field only in 90% of the dot areas. Although the expanded 5% or 10% areas have ink, the ink is thin and the density cannot reach the field density effect. Therefore, visually, the ink density of 90% or 95% of the dots expanded to 100% is not as thick and bright as that of 100% of the field density

② maintain the level in the depth basic color

(a) the range of dot gradation value of depth basic color is 65%~90%, and more than 80% is the area with the most enlarged gravure dots, which is easy to cause gradation

(b) for the basic color of this area that requires layers, attention should be paid to maintaining the layers in the depth basic color on the premise that the saturation of the field color block is sufficient. It is not allowed to merge the layers in the depth basic color in order to emphasize that the saturation of the field density is sufficient. It is also not allowed to pay attention to the layers in the depth basic color, which will affect the saturation. Treatment Essentials: the basic color of the depth of the required layer should be appropriately lightened to make it distance from the field density, so as to achieve the effect of mutual beauty

③ the basic colors in the middle note area are sufficient

the range of point creation value in the middle note area is 35%~65%, which is the main part of the object image and the key area to handle the color well. It is necessary to pay attention to adjusting the basic natural color of the object to the best saturation. The key is to deepen it by about 5% on the basis of the required color quantity of the hue, so as to highlight the visual effect of the object color. For example, the bright middle note m color of safflower needs 40% of color, which can be deepened to 45% to make the red more saturated and bright

④ the light tone in the highlight and bright tone areas shall be sufficient

a the range of dot level adjustment value in the highlight area is 1%~10%, the effective light tone of gravure printing is 5%~10%, and the very light color below 5% is lost due to the non transfer of small dots in gravure printing

b the light tone point order value range in the bright tone area cannot be compiled successfully, and the range is 10%~35%. Highlights and highlights are one of the key areas in color processing

the color quantity of the above two parts is insufficient due to the influence of three reasons: one is the poor transfer performance of the gravure printing process; The second is due to the influence of light level and color reserve during scanning; Third, for external panels, designers only focus on increasing the contrast of highlights, resulting in a serious shortage of light tones in highlights and high-profile areas, and the light tones in this area are the focus of attention, which is often not noticed by operators, resulting in the light tones of many products being flat and unsaturated, or even loss. Therefore, it is necessary to consciously deepen the basic color of the light tone in this area. It should be deepened by about 5% on the basis of the required color amount of this tone. For example, for light pink flowers, the M color amount needs 10% and should be deepened to 15%, so as to make the light pink full. A key technique here is to keep the lightest basic color away from extreme highlights or white paper. Such as light yellow, pink, light cyan, light green and other basic colors for deepening treatment, which can not only show a full light tone. It can also make the highlight outstanding, which is one of the technical secrets to make gravure printing products exquisite

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