The color of commodity packaging is the key to the sales of commodities, and it is the form reflection of the content, technicality and use of commodities. Therefore, handling the color of commodity packaging is the top priority of the gravure plate making process. Color is a complex problem. The cost of color control by various plate-making companies has been difficult to reduce. The color problem causes a lot of waste and loss in manpower, material resources, and time.
Of course, the problem is multi-faceted, but one of the main reasons is that the current pre-press image processing in China has undergone profound changes. Nowadays, customer submissions, high-quality color reversal films for scanning, photos and other originals are becoming fewer and fewer. More than 90% of the electronic image files are made by advertising design companies, mainly based on MO disks (magnetic and optical disks). Most of their image quality is very poor. Various physical colors in the disk and the original physical color and the color provided by the customer The colors of the manuscripts vary greatly. Therefore, it is necessary for the image adjustment personnel to carry out careful color adjustment and re-creation processing, so that the image color must not only meet the true color of the original object and meet the requirements of customers, but also meet the laws of electronic engraving and printing art. The image color Processing technology has become the key to the quality of the gravure packaging level plate making. The industry calls it the first face of the gravure plate making company. The leaders of many plate-making companies have realized that it is powerless to change the quality of customer manuscripts. They only have to strengthen their color management and vigorously train the image adjusters. Using the image artist ’s high artistic foundation, aesthetic vision and operational skills to the electronic image files of customers Perform technical processing and re-creation processing to compensate for defects such as poor image quality and incorrect hue, so as to improve product quality. The author believes that on the one hand, the current gravure plate-making company should try its best to do a systematic engineering management of the entire plate-making process, so as to stabilize the gravure proofing, adjust the digital proofs, grasp the electroplating process, standardize the electric engraving curve, strengthen the computer production, and base on the electronic distribution Toning, to ensure the accurate transmission of color information and to control the error of the color information during the copy process; on the other hand, to train more excellent color matching personnel, so that they have a certain art base, aesthetic level and scientific color, Artistic understanding, as well as mastering the methods and methods of color processing of gravure images, but also to understand the rules of gravure plate making and printing process, combining the color configuration rules and the characteristics of commodity packaging products with the printability, can we exceed customer expectations, Make quality products.
The following briefly introduces the techniques, methods, and methods of gravure image color processing researched and summarized by the author in the practice of gravure platemaking for more than a decade, for peer reference.
1. The theory of color processing for gravure images
According to the characteristics of commodity packaging products, the theory of color processing of intaglio images is: the true color of the original object should be taken as the basis, and the color of the heart of the people should be processed, and the original color and the physical color and the psychological color should be coordinated. Make perfect copies consistently. Specifically: it is based on the color of the original (magnetic, CD), based on the true color of the original object, and re-created according to the color of people's hearts. On the one hand, it must be fully loyal to the original color of the product and highlight the attributes of the product; on the other hand, it must meet customer requirements, highlight the saturation of color, and emphasize the commercial effect of color.
The method should use the combination of the restoration of the process technology and the re-creation of the color in the heart. The so-called reducibility of arts and crafts technology must first make the entire gravure platemaking process standardized, standardized, and digitalized color management, combined with automatic color management based on software, to make screen color, digital proofing color and gravure proofing color Close to, the reduction accuracy of digital proofing color and gravure ink proofing color should reach 95% ~ 98%. And under certain printability conditions, the four basic standards of gravure art (gray balance, tone setting, color correction, sharpening enhancement) are used as the guidelines. The balance curve and color correction data ensure that the manuscript is scanned after the black and white field is fixed, and the color of the manuscript can be restored after digital proofing. A technical essential must be emphasized here, "In order to finally print a good product, all the information required for the product must be obtained from the original when scanning, which is like recording music, first the microphone It ’s better, otherwise, there is no quality. " The second is the external electronic image file, through the adjustment of the image color, the digital proofing image color is restored to the image color or color draft image color that is fully reflected in the electronic. Finally, the color of the electronic color draft is adopted. This is the root of gravure image reproduction technology and the scientific nature of gravure image color processing. It should be treated as a science.
The so-called re-creation of color in mind is because color is not only a physical phenomenon, but also influenced by factors in people's hearts. Therefore, on the basis of the above-mentioned scanning standardization and restoration, according to the color of the commodity industry, according to the color of people's hearts, as well as the defects of the original manuscript and customer requirements, use various tools of Photoshop software for technical processing and re-creation Processing, that is, moderate exaggeration and rendering of color, makes it not only better than the original, but also exceed customer expectations, and can better meet the color requirements of people's hearts. This is the artistry of color processing of gravure images and the subtlety of color processing. It should be treated as an art. Only by combining the two closely can we produce high-quality products with high quality and high efficiency.
Second, before processing the color, clear the color basis
Before coloring a print, what is the basis of color? It is necessary to carefully read the process sheet and understand the customer's requirements for graphics, whether it is based on disc color grading, color manuscript grading, or reversal film, photo, print, etc. Specific basis, these must be clear in advance. If the basis is not clear or the basis is wrong, then the previous achievements will be abandoned. One of the reasons why the plate-making company has caused many internal and external rework is that the color basis in advance is unclear and unclear.
The second is to clarify the printability of the subsequent process. One is to understand what the substrate is? Is it film or paper. If it is a film, it is EOPP film, PE film, pearl film, light film, matt film, or PA nylon film, PET polyester film, heat-sealing film, etc. Such as paper, white paper, or kraft paper. And understand the elasticity, smoothness, whiteness and other characteristics of various paper textures. The second is to understand the characteristics of the ink, is it in the ink, surface ink or sky blue, pink ink? And master the three indicators of various inks, with gray, color deviation and efficiency.
Thirdly, it is necessary to clarify which printing factory the customer is, whether the machine of this factory is a high-speed machine, a medium-speed machine or a low-speed machine; What is the minimum and maximum dot value? If you do not understand the printing suitability and do not grasp the rule of dot changes, then the scan settings, tone, and color adjustment have no basis, and they must be blind. One of the contradictions between many plate-making companies and printing plants is that the image adjusters do not understand the product's printing suitability and the dot change rule, which often causes small dots to be transferred and the color cannot catch up with gravure proofing Samples and beat the skin.
Third, the steps to deal with the color
When dealing with colors, you must first have a clear concept of "purpose" and the method adopted to achieve this "purpose". In other words, first of all, we must figure out, according to the color of this product packaging bag, what kind of color should be produced? Conversely, what kind of technical processing and re-creation should be taken to produce the expected picture quality to ensure the production of the picture effect that meets the "purpose", we must think and analyze in advance, and be clear in our hearts There are a few. Then follow the rules of color processing, and adjust according to the order of the steps. You must adjust what you see, what you see, and what you think, resulting in blind and ineffective repeated adjustments back and forth. Proceed as follows:
1. Interpret the original. Before the operation, we must first use our own aesthetic vision and concave craft rules to interpret the manuscript, understand the main body of this packaged product, what are the characteristics of the product attributes, and what are the characteristics of the actual colors in the impression, analyze and compare the color of the disc What is the difference between the color of the color manuscript provided by the customer? Analyze whether the four basic standard data of the gray balance, tone level, color restoration, and sharpness in the color of the disc meet the printability requirements of the product, and what are the advantages and disadvantages And conceived in your mind, to what extent is it best to adjust it with reference to the screen color?
The author realized in practice that the manuscript is not interpreted in advance, the depth is not the same as the depth, only the interpretation is deep, the analysis is thorough, the vision is high, that is, the eye is high, and then the correct method is adopted for processing; that is, the hand High, in order to make high-quality products quickly and well, if the eyes are not high, hands can not be raised.
2. Color space mode conversion. At present, there are two color space modes for external electronic image files. One is the GRB mode for color separation generated by GCR; the second is that the RGB mode for color separation generated by GCR has been converted to CMYK mode. Most of them are now this mode. Two modes All are GCR's long-order black-tone adjustment process. Therefore, it should be converted or adjusted to conform to the process data of gravure packaging products with three primary colors and black version as the skeleton.
The first mode only needs to transfer according to the CMYK color separation parameter setting of the main process of gravure three primary colors, which is more convenient. There are four conversion methods in the second mode: automatic calculation method, filling method, adjustment tool selection method, and secondary conversion method. It can be selected according to the simple and complex situation of the original picture.
In the mode conversion, the setting of CMYK color separation parameters is very important, it will directly affect the printing effect, the best setting for gravure is as follows (Figure 1):
figure 1
3. Image sharpening. The first step of image processing is to sharpen, and adjust the blur caused by scanning, which is called "corrective sharpening", because the adjustment of the sharpening function will affect the change of tone value and color. The author sees that many operators sharpen the image after color correction and tone adjustment, resulting in changes to the corrected color and tone value, especially the small dots in the highlight area become smaller and the dark tone area The dots become larger, the image contrast increases, and you have to recheck and adjust the highlight and dark tone values. Therefore, sharpening should be performed first, and then tone and color adjustments should be made, and dark tone values. Therefore, the sharpening should be performed first, and then the tone and color adjustments should be made, then all the tone and color changes caused by the sharpening will be corrected together. At the same time, after completing the overall tone adjustment and color correction, before storing the image, it is necessary to make some moderate sharpening adjustments, called "target sharpening", which is also necessary. This is mainly to compensate for the loss of clarity in printing after the process. Degree, and to compensate for the lack or excess of the "corrective sharpening" in the first step, adjusted to visually, the sharpness of the image is slightly emphasized and it is better, which is extremely beneficial for maintaining the quality of the final printed matter.
4. Gray balance adjustment. A key to copying color images is to restore the gray in the original, and use the gray balance data as a guideline to correct the color cast of the original.
(1) Grasp the gravure proofing suitability and electro-engraving curve of the company. The Y, M and C primary color plates obtained through the experiment show neutral gray data after overprinting according to different dot area ratios.
(2) The key point of gray balance adjustment is: need the level of high-gloss white, 25%, 50%, 75% of the white and gray tone of the four parts, gray balance ratio value must be accurate, because the gray tone of these four parts is very Sensitive, with a slight error, it will be discolored.
(3) Practical experience, the gray balance dot value ratio should be slightly warmer, the gray tone is slightly warmer, and the visual sense is comfortable, especially the white porcelain bowls, white porcelain cups and other white utensils in many packaging products, slightly The warmer white-grey tone will be better.
(4) In some intaglio plate-making companies, the author adopts the adaptability conditions such as inside printing, surface printing ink, OPP film, etc., generally:
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5 4 Y 89 86 76 71 66 55 45 36 36 22 17 8 5 45. Tone level adjustment. Gradation gradation processing of gravure images. First, in theory, the printed image should have the same density range as the original. Therefore, the tone range that can be reproduced by the gravure printing suitability should be matched with the tone range of the manuscript, and the ever-changing manuscript tone should be adjusted to meet the requirements of the gravure electric engraving curve and printing suitability. Achieve the extremely effective range of gravure tone; the second is to establish the idea of ​​"key area", that is, special emphasis should be placed on emphasizing the layered texture of the main body, adjusting the color levels of various brightness of the main body to the best visual brightness Handle the tone levels of the three "key areas".
(1) Adjust the level of the highlight part. If the original highlight has a large area and a rich layered texture, the first is to adjust the three primary colors of extreme highlights to 0% as the brightest part of the image; the second is to adjust the highlight whites that require gradation and set the minimum dot value of the three primary color version Adjust to the smallest dot value that can be transferred from printing, and adjust to the proportion of neutral white dot value, also called the setting of basic white. According to the general gravure suitability, the adjustment setting is C6%, M5%, Y5%, C7%, M6%, Y6% or C8%, M7%, Y7%, etc.
(2) Adjust the level of the dark tone part. If the main part of the original is processed in backlight or dark, the adjustment method: First, take the neutral black of the darkened part of the image at the sampling point, without neutral black, take the deepest part, adjust the setting C90% ~ 93%, M86% ~ 89 %, Y86 ~ 89%, K70% ± 5%, the sum of the four colors is about 330%; the second is to use the black version to pull the darkest part and the second deepest part of the dark tone. Use the gradation curve to adjust the black version of the deepest part to 75%, and the local blackest part to 80%, and reduce the sub-deep middle level to about 60% to enrich the dark tone level.
(3) Adjust the level of the mid-adjustment part. The midtone is the focus of the image. Therefore, it is important to control the midpoint (M point), because the color density of the midtone is very undulating, and it should be adjusted to the best visual brightness. Generally, the density of the seventh ladder (point M) of the Kodak reflection ladder is 0.78, and the dot value is set to: C50%, M45%, Y45%, K5%. The density of the original manuscript is light and should be deepened. , The color density is deep, it should be lightened, and they are all close to the best visual brightness.
When using the cuyve curve tool of photoshop software to adjust the tone level, two points should be noted: (1) It is clear that the level curve acts on the adjustment of the tone level, the tone level should be adjusted first, and then the color adjustment; (2) less use and no level The curve tool adjusts the color, because the change of the gradation curve will affect the change of the gray system and the color system. If you want to use it, you must check out the color to be adjusted with the lasso tool to adjust it, or lock the local level segment for a small amount of adjustment.
6. Color processing. Color processing is the key to the success or failure of gravure color image reproduction. Since the current screen color and gravure proofing color cannot be "what you see is what you get", there is a big gap in some color gamuts, such as cyan and blue systems. Therefore, when processing color, the screen color cannot be used as the basis. The color of the EOPP film should be based on the ink of different characteristics such as the ink used in gravure printing, surface printing ink, or sky blue, pink ink, etc. Refer to the color spectrum printed by our company, the screen color is used as a reference, and the color is mainly configured by the dot value data. It should be summed up bit by bit in production practice, accumulate experience, find out which color gamut has the error law, and then compensate when adjusting color.
Standards for color processing: (1) first master the principle of true color, that is, it is accurate compared with the actual color; (2) do everything possible to make the color proofed digital proofing color catch up with the color of the customer's color draft, and gravure after electronic engraving The ink proofing color should catch up with the digital proofing color. The accuracy of the color reproduction of the two reaches 95% ~ 98%, and some color gamuts are even better than the color draft; (3) Try to meet the color requirements of people's hearts or customers' color requirements. Do not only be loyal to the original color of the product, but also meet the color requirements of people's hearts, to achieve the commercial effect of color.
Two points should be paid attention to when using the color correction tool of Photoshop to adjust the color: (1) The primary colors Y, M, C should be adjusted first, and then the secondary colors R, G, B should be adjusted; (2) Do not use the color correction tools to adjust Compound color, because compound color belongs to the gray system, if the color correction tool is used to adjust the compound color, the total amount of color correction is large, the color correction effect is small, and excessive color correction will seriously affect the change of the color system. If you want to use it, you need to check out the compound color you want to adjust separately with the lasso tool.
7. Artistic treatment. Artistic re-creation processing and fine processing are necessary for making high-quality gravure products. If there is no better than the original, there is no artistic processing and fine processing that meets people's hearts and colors, and it cannot cause emotional resonance between buyers and product manufacturers. It's not good platemaking quality. Therefore, in order to better express the characteristics of the colors of various commodities, on the one hand, according to people's subjective vision, the colors are dissolved into the operator's adjustment design, and the important colors of the picture are artistically processed, that is, moderately exaggerated Rendering, highlighting the psychological effect of color, so that it conforms to the real visual effect perceived by human eyes; the second aspect is not simply to adjust the color saturation, but to sublimate to correctly handle the normal proportional relationship of color according to the color configuration principle. The relationship between light and dark, cold and warm, highlights the three-dimensional sense of the physical form, sense of space, lightness; three aspects to carefully repair the original particles, roads, dirty spots, unevenness, etc., to achieve clean, smooth, delicate, refreshing and pleasant products The effect makes people look at the beautiful real pictures and induces the desire to buy, which requires the operator to have a high judgment vision and an understanding of objective physical colors, as well as master the color configuration rules.
The author has made elaborate artistic re-creation processing and fine technical processing according to the above three aspects in some plate-making companies, and produced many high-quality products. Not only have they been highly praised by many domestic customers and art designers, they have seen digital proofing and gravure printing. After the proofs, I think that, as with the expected effect, it is considered to be the best in the current gravure product packaging products. Moreover, it has been praised by some foreign customers in the United States, Japan and other countries, and is considered comparable to their similar products. At the same time, these products are a successful gravure proofing, really good and fast.
4. Methods and methods of color processing
The plate making and printing process of gravure product color packaging products is, in the final analysis, the process of color reproduction, and the most fundamental of these is whether the image color processing technology of the plate making company is excellent, whether it can bring out customer satisfaction, and can exceed customer expectations. Image color. Because the customer first looks at whether the color of the image is made well, whether it is bright or not, compared with the color manuscript, the color is not like it, and it does not conform to the color that he wants in his mind to comment on the quality of the plate making. At the same time, in the art of packaging, there are often saying that "look at the color from a distance, look at the flower first, look at the color first, then look at the flower, seven-point color and three-point flower", which fully shows how important it is to handle the color of the packaged product. Therefore, we should proceed from the practical commercial point of view, the point of view of the theoretical limit of the art of gravure art and the point of view of meeting the color requirements of people's hearts, combined with the color characteristics of commodity packaging products, according to the color configuration principle, according to the law of gravure art color processing. Overcoming the fact that many operators just look at the colors of the screen at random, blindly toning, and sometimes changing the lemon to orange, causing repeated work back and forth. Therefore, it is important to master the 10 methods and methods 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 and bright, even to an excessive degree. In fact, when processing, you can compress various colors by the same amount or lose one part of the color, strengthen the other part of the color, and sometimes balance the saturation of all colors. You should choose the best according to the original content and the main color, and master The essentials are as follows:
â‘ Depth basic primary colors are sufficient.
Various solid color blocks such as red, green, blue and other solid words and logos and other basic basic colors that do not require layers are sufficient. Generally, customers require these logos to be thick, thick, and bright. Therefore, to use 100%, it is necessary to make a full 100% field, in order to give full play to the maximum effect of the maximum solid density of the gravure ink, it can not be made 90% or 95%, although 90% or 95% of the dots will be printed Expanded to 100%, but this is different from the effect of 100% solid printing. 90% of the dots only reach the solid density in the 90% of the dot area, while the expanded 5% or 10% area has ink, but the ink is thin and the density does not reach the solid density effect, so from a visual point of view, 90% Or 95% of the dots expanded to 100% ink density is not as thick and bright as 100% solid density.
â‘¡ Maintain the gradation in the basic color of depth.
(A) The dot tone value range of the depth basic color is 65% to 90%, and more than 80% is the area where the gravure dots expand the most, which is easy to cause gradation and gradation.
(B) For the basic colors that need gradation in this area, under the premise of emphasizing the saturation of the solid color patch, pay attention to maintaining the gradation in the basic color of the depth. When grading and grading, we cannot pay attention to the gradation in the basic color of the depth, which affects the lack of saturation. The processing method is to moderately reduce the depth of the basic color of the required level, so as to distance it from the density of the ground, so as to achieve the effect of the two sides.
â‘¢ The basic colors of the middle tone area are sufficient.
The mid-tone area's dot creation value ranges from 35% to 65%, which is the main part of the object image and is the key area to handle colors. We should pay attention to adjust the basic color of the object to the best saturation. The main point is to deepen the visual effect of the object color on the basis of the amount of color required by the hue, and to deepen it by about 5%. Like the safflower, the bright and middle-tone M color needs a color volume of 40%, which can be deepened to 45% to make the red more saturated and bright.
â‘£ The light tones in the highlight and bright areas are sufficient.
The dot tone value range of A highlight area is 1% ~ 10%, the effective light tone of gravure printing is 5% ~ 10%, and the extremely light color below 5% is lost due to the transfer of small dots of gravure printing.
The tone value range of the light-tone dots in the B tone area is 10% to 35%. Highlights and bright areas are one of the key areas for color processing.
The color quantity of the above two parts is insufficient due to three reasons, one is due to the small dot transferability of the gravure process; the second is due to the influence of the light level and the amount of color retention during scanning; the third is from outside As the designer only cares about increasing the contrast of highlights, the light tones in highlights and high-profile areas are seriously insufficient, and the light tones in this area are the center of attention. This is often not noticed by the operator, causing many products to be light. The hue is dull and unsaturated, and even lost. Therefore, to consciously deepen the basic colors of light tones in this area, it should be deepened by about 5% based on the amount of color required by the hue. For example, for light pink flowers, the M color amount needs to be 10%, and it should be deepened to 15 %, Thereby making the pale pink plump. A key technical point here is to keep the lightest basic colors away from extreme highlights or white paper. Such as light yellow, pink, light cyan, light green and other basic colors for deepening treatment, so that it can show the fullness of light tones. It also makes highlights stand out, which is one of the technical secrets of making gravure products fine.
2. Treatment of color brightness. Commodity packaging products, which require bright and bright color, the processing methods:
â‘ Make basic colors that are bright, medium and deep. Only the basic colors can make the colors bright and bright. The principle is that the basic colors should be sufficient but not light. If the basic color is insufficient, the color will be dull.
â‘¡ To adjust the highlight to bright colors, try to use primary colors or intermediate colors to make full use of the purity of the three primary colors ink to express the brightness of the color, do not use or less use the opposite color. In terms of pigment mixing theory, the darker the pigment, the darker the color will be if the opposite color is added to the bright colors.
(A) Orange color, orange red, can not put the opposite color C version from the highlight to the bright part, if put a little C version, orange, orange red will be gray and not bright, orange, orange layered texture from Y, M Basic colors.
(B) Vivid emerald green, the high-tone part can not be placed in the opposite color M version. If the M version is placed, the emerald green will be gray and not bright.
(C) The skin color of the characters, especially the facial skin area of ​​cartoon characters and the like is small, and the color of the opposite color can not be placed in the C version of the bright color to 20% of the Y and M color versions. . Where to start the C color version depends on the length of the character's light and dark levels and the dot value of the Y and M color versions.
Of course, high-quality portraits like folios, folio calendars, and beauty photos of promotional videos should be placed in the C version to fully express the color changes and three-dimensional sense of skin tone.
3. Processing of hue accuracy. Commodity packaging products, first of all, emphasize the accuracy of the original color, and make the color of the screen truly reflect the appearance and characteristics of the real object. If the color of the objective object is inaccurate, and the tomato color is made orange, then the copy fails. The second is to particularly emphasize the accuracy of the copy color and the color of the customer's color draft. Now the customer requirements are quite "harsh", and the color of each part must be consistent with the color of the color draft. Therefore, the following points should be mastered:
â‘ Firstly, the basis of the customer's request for color is clearly defined. If there is a basis, try to adjust the color according to the basis. If there is no basis, only the amount is required to be adjusted to a good amount.
â‘¡At present, many customers are demanding to pursue the color of the color draft. Due to the difference between the screen color and the color gamut of digital proofing, it is indeed very difficult to accurately catch up the color of the color draft. The method adopted by the author is to first digitally sample the electrical sub-image or external image file, and then analyze and compare the digital proofing color. The screen color and the color of the customer's color draft are the three color gamuts. In some cases, the color of the customer's color manuscript will prevail, and the screen color will be used to make a purposeful, directional and accurate color adjustment based on the color of the screen, so that you can take a lot of detours and avoid readjusting and reprinting the digital samples. Some have to retune and replay 6 to 7 times or even 10 times.
Color matching method using dot value data: First, the screen dot value data of the screen color is compared with the shade of the color manuscript; and the second is to refer to the dot value data on the gravure sample chromatogram of various ink characteristics printed by the company. Adjust. Be meticulous, fine art, and meticulously catch up with the color manuscript, to ensure that the accuracy of the digital proof drawing color and the client color manuscript drawing color reaches 95% ~ 98%, so that it can be used effectively.
â‘¢ Focus on the accuracy of the inherent hue. The inherent color is the original color of the object and must be accurately reproduced. The method is A. Determine what is the inherent color of the object; B. Determine what hue is the basic color of the inherent color; C. Measure whether the deepest primary color or intermediate color part of the required level reaches 90% ~ 95%. The field is 100%; D. Determine the hue of the opposite color of the intrinsic color; E. Measure whether the opposite color of the brightest part reaches 0%.
(4) Accurately handle the hue of the bright and dark surfaces of the object. The hue of the bright and dark surface of the object is affected by the color of the light source. It is a combination of the color of the light source and the inherent color. It is generally the hue and chromaticity of the color of the light source. The hue of the dark tone surface of the object is a mixture of the inherent color and the ambient hue. The color always has the tendency of complementary color of the light source color. The accuracy of the color of the bright tone surface and the dark tone surface is handled well, which can show that the color change of the object is rich and reflects The high-end product quality requires a higher aesthetic level and operating skills of colorists.
4. The treatment of color master-slave principle. When adjusting the color, you must proceed from the overall picture, emphasizing that the color of the main part must be saturated and prominent, and the background color should be lighter and darker. It can't be adjusted regardless of the master and slave, and it can't be reversed.
When dealing with colors, it is necessary to pay attention to the relationship between the overall hue and the local colors. When adjusting the local colors, the whole should be closely integrated. When setting the color at high speed, the relationship between it and the main colors must be considered. The normal proportional relationship of colors must be maintained.
The current gravure platemaking requires that the color of the picture is to emphasize the accuracy of the main color. Therefore, the accuracy of many electrical sub-colors. Therefore, many electrical sub-image colors and external disk images almost need to be adjusted for local details, and some images have to be checked out individually for adjustment. This often pays attention to the subordinate colors and ignores the main colors, resulting in color The Lord never distinguished, or even won the title. This is one aspect that makes the current color processing of gravure packaging products simple and low-grade.
â‘¢Analyze the main (color that plays the main role) and the relationship (color that plays the role of the main) of the color of a picture. The general rule is: the main color is saturated, prominent, bright, and the color is light, virtual, dark Some, its role is to set off the main body, the set color must not be adjusted too dark, too fresh, too bright, and cannot be the winner. When there is a contradiction between the master-slave relationship of processing colors and the perspective rule, the principle of master-slave should be the main principle. It is necessary to handle the master-slave relationship of colors well.
5. Treatment of three-dimensional color. Most of the product packaging products use photographic manuscripts (reversal films, photos or digital photos, etc.). To properly handle the relationship between light, objects and shadows in photographs, first of all, we must deal with the relationship between the light and dark of the objects and the light and dark of the three major surfaces. The layers are expressed, highlighting the three-dimensional sense of the object. On the photo screen in the second-degree space, the three-dimensional sense of the object image, the sense of depth and the spatial sense of the environment are displayed. This is one of the important technical indicators for making the gravure packaging layered version fine. . The processing method is as follows:
â‘ Correctly handle the light and dark relationship of objects. When expressing the bright and dark parts of an object with colors, it is necessary to maintain the light-dark relationship that appears when the object is illuminated. Only by contrasting light and dark can the subjective sense of the object be brought out. The first method is that the basic colors must be changed in different shades. The basic tone of the middle tone cannot be darker than the dark tone. At this time, special attention should be paid to a problem. Because the external electronic image file uses the GCR process, the black version replaces the complementary color, resulting in The defect of the basic color of the dark part of the object is reversed, that is, the basic primary color of the dark part is lighter than the basic color of the middle tone, so the basic color of the dark product is insufficient, the strength is not enough, and the middle tone of the object cannot be supported. Therefore, it must be selected separately to deepen and enhance the three-dimensional sense of the object. The second is to use the complementary color to express the contour level of the object and the contrast between the light and dark. Pay attention that the complementary color of the dark part of the object cannot be too much, resulting in too bright and bright colors. Thereby losing the light and dark relationship and three-dimensional sense of the object.
â‘¡ Correctly handle the relationship between the color quantity and the light quantity level of the color. When adjusting the color, be careful not to make the color volume of the bright tone part exceed the color volume of the middle tone part, and cannot make the color of the middle tone part exceed the color tone of the dark tone part. Keep the proportional relationship between the color amount of the color and the light level, Don't just pay attention to the emphasis on color and lose the normal proportion of color, so as to lose the three-dimensional sense of the object, giving people a dull, uncomfortable feeling.
â‘¢ Correctly handle the black tone. To make full use of the black version to express the outline level of the object and to bring out the three-dimensional sense of the object, the key is to handle the tone of the black version and understand the shortcomings. On the basis of the short-order tone skeleton black version, according to the size of the original dark to medium tone, the tone of the black version should be appropriately extended to enhance the three-dimensional sense of the object.
6. Color continuous processing of this tone. The photographic manuscripts of packaging products such as food and seeds have a relationship of three major sides, that is, bright tone, middle tone and dark tone, and the colors are connected to each other naturally, with continuous transitions, and the art of gravure art. There is always a high contrast between the two ends, that is, the highlight is easy to lighten, and the dark tone is easy to deepen, resulting in the phenomenon of stiffness of the tone, that is, the loss of the light tone light meter, the light tone of the middle tone, the excessive tone of the deep tone, and the excessive tone of the deep tone. Tone. Therefore, it is important to grasp the following processing methods.
â‘ First understand the relationship between the three major surfaces of each object, and the continuous transition of color tone, and adjust the image contrast to the range of gravure printing suitability.
â‘¡ A. Bring the tone of bright tone and bright middle tone to nature, and deepen the light tone of the highlight area to make the transition between light tone and bright tone natural. B. One of the basic colors of the middle tone is the bright tone, and the second is to maintain the continuous transition tone with the deep tone.
â‘¢ The key technology to deal with the continuous transitional color lies in the adjustment of the main color version, that is, the M color version of the warm color and the C color version of the cold color. Full color, soft and harmonious feeling. At the same time, we should also pay attention to the continuous transition tone of the black version. The key point is that when doing the gradual wind, the transition between the outlet and the outlet and the 75% ~ 90% area must be natural and transitional.
7. Processing of color jump area.
â‘ Deal with the color of 80% of the dot jump area. According to the rules of gravure engraving cylinder dots and OPP film proofing and printing dots increase, as the tone deepens, there is a simultaneous increase in dots and cell depth. The dots increase with the percentage ratio and increase linearly. The more the dark tone increases, the more urgent. The 80% area is a jump area where the dots turn. More than 80% of the dots increase linearly. The color gradation is easy to merge. The increase of the dots below 80% is relatively gentle, and the level can generally be printed. as shown in picture 2.å› æ¤ï¼Œè¿™é‡Œè¦é‡è§†ä¸€ä¸ªé¢œè‰²å¤„ç†çš„è¦é¢†ï¼Œåº”把最深的基本色，如大红基本原色与处在暗调的，网点值在80%~85%区域以的肉色ã€èŒ¶è‰²ç‰å¤è‰²æ‹‰å¼€è·ç¦»ï¼ŒæŠŠæš—调的å¤è‰²é™æµ…到80%以下，为75%~78%，以é¿å¼€80%这个网点跳跃区。如（图3）所法。
figure 2
image 3
è¿™æ ·ä¸€æ–¹é¢å¯ä»¥ä¿è¯æ‰“æ ·ï¼Œå°åˆ·æ—¶å°è¶³å¤§çº¢å®žåœ°è‰²ï¼Œå¦ä¸€æ–¹é¢åˆå¯ä½¿æš—调的肉色ã€èŒ¶è‰²ç‰å¤è‰²æ—¢ä¸å†’红，åˆä¿æŒå±‚次，å–得两全其美的效果。
②处ç†å¥½5%ç½‘ç‚¹è·³è·ƒåŒºçš„è‰²å½©ã€‚æ ¹æ®é›•åˆ»æ»šç’对å°ç½‘点容易æŸå¤±å’Œå› 高光调墨稀而影å“OPPè†œæ‰“æ ·å’Œå°åˆ·æ—¶çš„å°ç½‘点转移性差的规律，5%以下å°ç‚¹ä¸€èˆ¬æœºå™¨è½¬å°ä¸å‡ºæ¥ï¼Œå½±å“高光浅色调的色é‡ä¸è¶³ï¼Œå¹¶å®¹æ˜“与æžé«˜å…‰ç»ç½‘éƒ¨åˆ†å¹¶çº§ã€‚å› æ¤ï¼Œè¦æœ‰æ„识地把高光调的基本色ç¨ä½œåŠ 深处ç†ï¼Œä»¥é¿å¼€5%这个网点跳跃区，既ä¿è¯é«˜å…‰è°ƒè‰²å½©é¥±æ»¡ï¼Œåˆä½¿é«˜å…‰æµ…色调ä¸å‡ºçŽ°ç¡¬å£ã€è„±èŠ‚ã€ç²—糙弊病，处ç†å¥½ä¸¤ä¸ªç½‘点跳跃区的色彩是æ高凹å°å½©è‰²å±‚次版产å“è´¨é‡çš„两个ç»æ‹›ã€‚
For the meat marinating solution we refer to meat tenderizer, Saline mixer, Saline injector(brine injection systems), vacuum massage tumbler.
Saline injector can evenly inject the brine and salt auxiliary materials into the meat blocks, which can shorten the pickling time and greatly enhance the taste and yield of the meat products. The machine can be adjusted with stepping rate, stepping distance, injecting interval and injection pressure according to the technological requirements. Then the brine and salt auxiliary materials can be injected into the meat evenly and continually to reach the optimal effects.
While vacuum tumbler makes meat rolled in the drum under vacuum condition, similar to pulmonary respiration (make product to inflation and shrink alternatively). It makes meat salted evenly, increases the adhesive quality and taste and ensures the freshness of meat.
Injector series:multi needle injector,brine injector,poultry meat injector,fish injector,red meat injector,marinating injectors,pickle injector
Red meat and poultry injection machine with capacity of needles 50
Red meat and poultry injection machine with capacity of needles 74
Red meat and poultry injection machine with capacity of needles 118
Red meat and poultry injection machine with capacity of needles 236
Tumbler series:vacuum tumbler,meat tumbler
Small capacity vacuum tumbler and massager with capacity 200L and 500L
Medium capacity vacuum tumbler and massager with capacity 1000L and 1600L
High capacity vacuum tumbler and massager with capacity 2500L and 3500L
Turnover type vacuum tumbler and massager with capacity 2500L
Manual Brine Injector,Vacuum Tumbling Machine,Industrial Meat Tenderizer,Meat Tumbler,Poultry Meat Injector,Fish Injector,Red Meat Injector
Helper Machinery Group Co., Ltd. , https://www.helperfoodmachiney.com