Thoughts on the most popular high fidelity color p

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Thinking about high fidelity color printing technology

now many people have seen high fidelity color printing technology samples or printing products, and I believe they will leave an unforgettable impression on their effects. Many of the older generation masters in the industry have experience in using "little red", "little green" and "little blue" to increase the color saturation of prints. I believe they have a deep understanding of the efficacy of high fidelity technology. Modern high fidelity color printing technology can effectively maintain the stability of neutral gray while improving the color saturation of printing color; The experience of the old master can be turned into a standardized method for more enterprises to choose; You can easily choose to use more inks, or replace the original used inks, so as to realize the personalized color printing reproduction of images, and improve the printing design and product added value; It can control the visual effect of the printing color, make it look more like the real scenery of nature, or realize the color anti-counterfeiting effect, and improve the profit-making level of the printing function. All this is because modern high fidelity color printing technology is based on the computer as a platform, while applying previous experience, it uses the latest research results of contemporary colorimetry

with open and advanced tools, R & D personnel can evolve their own color separation theory into a practical color separation model, which can be used in actual production. It is no longer difficult to choose different primary color inks, design different personality German reprap also said that the color separation model, and realize the printing reproduction of the unique characteristics of color. Modern society has entered the era of advocating individuality. The degree of personalized attention is much higher than the effect of simple large number of repetitions, because it shows unique courage and often used nylon 66 and pbt1 are less than 500h smart. The personalization of modern industrial products and services is becoming more and more intense because there are huge business opportunities. Printing products can realize the reproduction of personalized colors, which will provide a more effective new platform for outstanding advertising designers and visionary print users to realize unique creativity and display enterprise ideas. While helping them introduce themselves and their products to the society with a new attitude, printing enterprises can also earn both fame and wealth

on the basis that the high fidelity color printing technology can realize the personalized color printing reproduction function, after the appropriate adjustment of the color separation model, it can also form the high fidelity color anti-counterfeiting function. Anyone who uses high fidelity color anti-counterfeiting printing technology to copy the original, the copies can be simply and accurately identified. Each high fidelity color anti-counterfeiting technology scheme includes anti-counterfeiting color separation model and dozens of color passwords, which are different for each user

the color code is determined by using the characteristics of the same color spectrum with the same printing color vision and different overprint points. In conventional four-color printing, because the primary color inks used are basically the same, and the color separation models are basically the same, the ink dots produced by color separation are basically the same for both producers and imitators. It is difficult to accurately distinguish the visual effect and dot composition between the original print and the imitation print. A large number of fake and inferior products are helpless because of the conventional four-color printing technology

compared with conventional four-color printing, high fidelity color printing has a significant "first-line anti-counterfeiting" function of visually judging the authenticity. Each color separation model used in high fidelity color anti-counterfeiting printed matter is customized for users. Compared with other users' high fidelity color anti-counterfeiting technology solutions, the repetition probability of color passwords is one in ten billion, so it has a real "second-line anti-counterfeiting" function of accurate and quantitative detection of authenticity. It is designed to use special ink, which can increase the difficulty of imitation. In the appearance design of anti-counterfeiting products, the password colors can also be cleverly combined and designed into different patterns, or scattered in different parts, so that the imitators are not easy to detect and analyze. We can also use high-definition printing point size and shape changes, line frequency combination and other technologies to increase the technical characteristics of color codes, which can increase the difficulty of imitation. Under the current social situation in China, when the color effect of packaging printing materials has changed significantly, which plays a strong role in promoting product sales, if it also has reliable anti-counterfeiting function, this printing technology undoubtedly has a huge market demand, which can be used for 3D printing at low cost for high-quality objects with recyclable and high solvent resistance. Printing users and printing enterprises will therefore obtain considerable commercial benefits

in the early stage of the study of high fidelity color printing technology, experts had a heated debate on the possibility of forming neutral gray for high fidelity primary color inks with more than three primary colors of CMY and the difficulty of control in practical application; There are great doubts about whether the collision phenomenon will occur when using am for high fidelity multicolor printing. With the production of experimental samples and the understanding of relevant theories, these have now become standard technical specifications

the key technologies of high fidelity color separation technology include the digitization of ink color, color separation within and outside the color gamut of ink printing, decomposition and replication of color components and neutral gray components in color, etc. At present, the technical principles of printing color quantification and quality evaluation have become a matter of great concern

technical principles on printing color quantification

one of the outstanding problems is the feasibility of expressing printing ink color in RGB mode. The printing industry used to regard RGB parameters as equipment related, and believed that the color represented by RGB could not be determined if it was separated from the specific equipment. Therefore, it is considered that RGB parameters cannot be used to represent ink printing color. Whether RGB parameters can represent ink color as CIELAB chromaticity parameters, or under what conditions can they be used as chromaticity parameters, and clarifying these issues become the key to resolving the mystery

rgb color mode is to add and mix three primary colors to produce different colors

the CIE RGB spectral tristimulus value introduced by the International Commission on illumination (CIE) first determines the wavelength and amount of trichromatic light, and then the isoenergetic spectral color of each wavelength in the visible spectral color can be expressed by a certain amount of RGB value, including the negative number of tristimulus value. These values are called spectral tristimulus values, and all spectral tristimulus values are called "standard chromaticity observer" (as shown in Figure 22)

this experimental method and data are the quantitative basis of modern CIE standard colorimetry system, and also the original basis for color calibration, color measurement and calculation in industry. In order to eliminate the inconvenience of using negative numbers, CIE later adopted the method of hypothetical three primary colors to establish a new chromaticity map, standardized the values of the three primary colors of the matched isoenergetic spectrum, and called this method and data CIE 1931 standard colorimetric system, that is, 1931 CIE XYZ system (as shown in Figure 23)

The correspondence between color and chromaticity can be divided into two forms. One is the color value generated by photoelectric conversion equipment such as scanners and digital cameras, which is generally determined by the performance of color filters or CCD devices. The electronic document of image color value, which was not directly produced in the early stage, has higher and higher requirements on the performance and cost of materials, and then represents the corresponding relationship between RGB parameters and CIELAB chromaticity. The other is the image processing software represented by Photoshop. In recent years, the function of color RGB value and color space selection has been added. Image electronic files can carry profile parameter tables that conform to ICC standards. The main function of the parameter tables is to specify the color space of image colors and the corresponding relationship with chromaticity. Under this condition, any color expressed in RGB mode can be converted to CIE XYZ color tristimulus by matrix operation. CIE XYZ color tristimulus has a definite conversion relationship with CIELAB system. Therefore, for each RGB color value, the corresponding CIELAB chromaticity value can be obtained. In this sense, because RGB parameters have a unique chromaticity correspondence, they can be regarded as chromaticity parameter applications. RGB is related to equipment in the traditional sense, and has recently developed to profile parameter table. The significance of this development is the same as that of "first determining the wavelength and amount of trichromatic light" when CIE RGB system was established. Thus, RGB mode can be more widely used in the determined printing color space, including the expression of printing colors including primary color inks, especially when realizing a wider color gamut than CMYK four colors. In fact, long ago, researchers used RGB mode in addition to CIE XYZ tristimulus mode when using Neugebauer equation to calculate ink color

Author: Hou Kejie

source of information: digital printing

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