Authenticity of the hottest color matching

2022-08-02
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The authenticity of color matching

the authenticity of color matching

-- the dynamics of color matching and color perception, For this reason, you may have been rejected by customers more than once. When matching colors, the relevant technical problems to be considered include color description, digital display, color synthesis system, toner (pigment), printing technology, measurement, observation conditions and the surface of substrate, etc. the change of each factor has a great impact on the ability of matching colors. It is almost impossible to fully consider each of the above-mentioned factors, but in the process of production, we should take into account some main aspects and the relationship between them as much as possible

color description

the core of color management is the way colors are described. At present, the most common and popular method is Pantone matching system of Pantone company. The system has the ability to provide the designers and users with color descriptions, while the printers use various methods to reproduce these explained colors as accurately as possible. The copying process is related to whether the selected ink system meets the standards of Pantone company. On the surface, this process sounds simple and perfect, but there are actually many potential problems for silk printing

many printers are familiar with 1012 Pantone color parameter guides: Pantone color selection manual. It contains all colors that can be printed on coated or uncoated paper, as well as optional Pantone color mixing formula

for silk printers, they were faced with the problem of color matching from the beginning: almost all chromatograms were made by offset printing, and the ink formula was also designed for offset printing ink. In fact, Pantone color matched by silk printing process can only be called "Pantone analog color"

when trying to use Pantone color matching reference manual, the screen printing brush industry must remember several limitations. First of all, the publication time of the reference manual should be clear. The surface color of the manual published for a long time will be oxidized. It is recommended not to use the manual published a year ago. In recent years, Pantone began to mark the date on the manual for reference. Due to the high price of these manuals, it is always reluctant to give them up, but their colors are very different from the new version. Continued use will cause serious decline in product quality. Therefore, we must weigh them carefully when making a decision. This also applies to designers and production departments, and the version used by printers should be consistent with the version recommended by customers, which is the only way to ensure accurate color matching

another challenge for silk printers is that the range of printing materials is too wide, and these materials will have a great impact on the appearance of printing colors. For example, if printing on textiles, is the coated Pantone chromatogram used as a reference? It is difficult to make a decision whether to use uncoated Pantone chromatography as a reference, which requires rich experience of the printing industry. If you use UV ink for printing, you need to consider the gloss problem, because the gloss of UV ink is much higher than that of coating material. In either case, the customer is the key person who ultimately determines whether the color matches accurately. If the ink mixing value indicated in Pantone chromatography is used for production, it should also be noted that many factors of color reproduction are beyond the control of Pantone chromatography

in addition, the operator's control of color is largely related to other factors to be introduced below

digital display

since we have now entered the world of digital prepress, all image originals are stored as electronic files in vector format or raster format. On the monitor, we can view the color of the image. The appearance of the color depends on the scene seen by the human eye. However, no two monitors or observation conditions are the same, so the color observation needs to be completed under the control of the color management system

digital color management obtains completely consistent colors by describing and correcting the characteristics of each display. As a printer, our job is to ensure that the observed conditions are as close to these parameter descriptions as possible when viewing documents, and to confirm various colors specified by customers

although we will not discuss the ICC Color Management description file here, the various components that make up the ICC display properties file have a great impact on the color appearance we observe. The following points should be considered in the display observation factors:

· color temperature during observation (5000 ° K or 6500 ° K)

· working color space (sRGB, Adobe 1998, apple, color match, etc.)

· display gamma value

· white dot and black dot

· display contrast

these factors are different on each display, resulting in the change of RGB value, making the appearance of the same Pantone reference color very different; Similarly, the l*a*b* values of the same color will be different. In addition, there is a great difference between the light emitted by the display and the brightness reflected from the surface of the printed matter, which further exacerbates the failure to achieve a perfect match between colors. In the case of 460million wet diaphragm shipments, the arduous color matching should also be based on the color code provided by the customer

with the continuous improvement of design and color management technology, display parameters and feature description files have become more perfect. Most color management systems allow feature description files to be embedded in graphics and image files. Of course, in order to ensure the accuracy of the characteristic file, it is required that each person operating the computer should have the knowledge of digital color management

color synthesis system

the right figure describes the strong influence of contrast between adjacent colors on hue. The chromaticity value on each color bar is exactly the same, but from a visual point of view, the color from left to right is different due to the gradient of the background color

The color synthesis system designed by PANTONE for the silk printing industry is a big project, mainly because there are too many substrates and inks involved in silk printing. Moreover, there are many related process variables in the production process, such as the number of holes and tension, which will change the hue of the printing color

all color matching ink systems are based on translucent white substrate, and various pigments are mixed together to form the main color. The number of main colors is closely related to the type and opacity of the ink. The higher the opacity of the ink, the more main colors can be obtained. The color synthesis system recognized by Pantone company has as few as 9 colors and as many as 21 colors. Therefore, between different ink brands and different substrate materials, the matching formula of each Pantone is also different

when an ink company has identified a set of ink matching system, they need to submit a certain number of color samples to PANTONE for evaluation. When these colors are judged to be very close to Pantone colors, Pantone will grant the ink company a license for a complete color matching ink system, even though many colors in the chromatogram have not been directly verified by Pantone. When applying for this kind of license, Pantone could not verify all the colors printed on coated and uncoated paper of each ink company one by one, but they developed a set of reasonable sampling system, through which they could make a comprehensive judgment on the overall color of the company

for printers, the safest way to realize Pantone color mixing and matching is to carry out actual detection according to the formula marked on the color samples provided by customers. Although there will be some errors, such operation is very meaningful

pigment and printing technology

in terms of processing a variety of substrates and printing applications, silk printing has a very powerful function, which is unmatched by other printing processes. In the process of silk printing, water-based ink, solvent-based ink, UV ink and hot-melt ink can be used, as well as ceramic decal printing ink. There are also many kinds of ink drying, which can avoid scratching the objective lens. The temperature ranges from room temperature to several thousand degrees in the kiln (making ceramic products) through air drying, UV curing, hot melting or baking in the kiln. Such a big change makes the demand for pigments in silk printing very unique

pigments that can work normally at room temperature will have poor results at high temperatures. Solvents, resins and additives used in pigments to meet certain appropriate printing properties will also cause great changes in color. The temperature changes yellow and red. In addition, the process principle, such as dye sublimation process, will also affect the hue. Similarly, some pigments that can show excellent red and purple will become very pale under the high-intensity ultraviolet light required by polyester UV ink

ink manufacturers have been trying their best to find acceptable non-toxic, non heavy metal, economic, applicable, easy to buy ink that can deliver ideal colors. But usually, the nature of the printing operation or substrate makes it more difficult to find an ideal ink solution, and the result is far from the desired color effect

as mentioned above, the surface properties of the substrate affect our perception of color 2 and electronic universal series. In addition, when considering the color change, we should also pay attention to the thickness of the printing ink. The thickness of the ink layer deposited on the substrate will significantly change the hue of the ink. Here, we propose to summarize the variables that affect the thickness of the ink layer, such as the number of holes, the diameter of the line, the tension of the line at rest, the tension of the line at the time of printing (the relationship with the release clearance), the angle and pressure of the scraping plate, the hardness of the scraping plate, the sharpness of the edge of the scraping plate, and the thickness of the template. The number of permutations and combinations of these variables is very amazing, so the color changes they bring are also very large

in order to maintain the repeatability of silk printing, a chromatogram of silk printing printable color shall be prepared to confirm the printability of color, and a color matching standard shall be established within the company and submitted to the customer together with the chromatogram. Because there are so many variables in silk printing, this may be the only way to accurately copy colors in the future

measurement and observation

more and more printers are willing to buy densitometers and spectrophotometers. In recent years, the prices of these devices have also dropped significantly. Even some small printing companies can afford them. They have designed some very cheap measurement solutions for their companies, with the lowest price of $1000, including hardware and software. With the continuous progress of digital color management technology, a number of new devices with better effect and lower price have emerged

the ability to represent color with numerical values is very meaningful. It provides a

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