Special color printing and computer color matching (2)
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Therefore, if the special color is to be manually adjusted, it will be a difficult challenge. The accuracy of the formula is usually difficult to predict. The commonly used colors may be matched in a few hours, and the special colors may not be adjusted for a whole day. In general, manual deployment costs a lot of material and labor time, so computer color matching can solve related color matching problems. Computer color matching is based on the phenomenon that color is absorbed and reflected by light. The pigment will absorb and reflect different degrees after being exposed to light. The wavelength of the reflected light determines the color seen by the eye. In computer color matching, there are two basic values when calculating the ink formulation: K value (light absorption value) and S value (light reflection value), and R value (spectral reflectance) to calculate the formula. Special color ink coating only has the variation of K/S value on paper, that is, the surface property of paper must be summarized into printing suitability for proofing application. Therefore, before the color matching, a mother color database of ink must be established, and the mother of ink is recorded in detail. The K and S values of the color color. When color matching is to be performed, the computer will combine the K and S ratios of the respective monochrome inks according to different percentages to obtain the closest ratio of K and S to the desired color. Combination, so the computer color matching can save a lot of manpower and material resources compared with artificial color matching.
Computer color matching in the actual situation is not 100% completely consistent, because it is related to the database established by the user, in addition to the system level, because the first step of computer color matching, in the database of ink data, each A color must be added with different proportions of Willy oil or white ink, then measure the K, S value, and then evaluate the database, because the accuracy of the database determines the effect of the recipe, the accuracy of the database is not good, then The correct color cannot be adjusted. In addition, for the actual application, the printed material used in the actual printing is different from the printed material used in the establishment of the laboratory, which may result in poor computer color matching accuracy, printing pressure, ink film thickness, water supply. The amount and printing speed control are slightly changed, the color blocks will have great color difference, and the special color will form color variation before and after drying, so the appropriate printing conditions and coating proofing system are adjusted, in computer color matching. It is very important. Although the use of computer formula can save users about 10%-20% of the expenditure, the initial formulation time is nearly double that of manual deployment, and the number of color modification can be reduced by about 50%; the remaining The ink is almost completely recyclable; improving the color quality of the special colors, reducing customer complaints and the number of returns, these benefits will far outweigh the use of artificial color matching for the printing house.
Therefore, the development and application of computer color matching technology can solve the time, manpower and material resources that the printing factory wastes on the color matching, to assist the printing factory to solve the problem of lithographic color matching, and also to improve the competitiveness of the lithographic sheeting machine, in the face of rotary printing. When the challenge of large-scale and economical production costs is emphasized, the emphasis on improving the high added value of special-color printing products will be the best competitive weapon for sheet-fed printing presses and rotary machines. Therefore, the Printing Industry Technology Research Center integrates the government-supported science and technology project funds and the ability to apply research in printing technology, and cooperates with the industry's overall demand in the industrial strategy to study the key technologies of printing computer with color ink application, and to develop advanced special colors (spot Color) Control technology and the use of profiles, electronic color tables, and then the use of dot-spot simulation of special color proofing technology, the industry can make full use of digital technology in color reproduction and digital proofing applications, strengthen digital printing process capabilities, enhance more Excellent and more efficient service; also establish a set of automatic, labor-saving, and convenient printing color matching ink calculation system, which can calculate the printing area accurately by computer software, and will not cause a large amount or insufficient color matching ink. The problem, this part of the application will be combined with the information after the completion of CIP4 and RIP, can more effectively apply digital information, of course, the coloring residual ink caused by cleaning solvents, dirty rags and other environmental pollution environmental problems, but also by accurate ink The application of weighing technology has greatly reduced the amount of solvent used, enabling the operator to obtain precise control of the special color introduced into the digital printing process, helping to improve the quality and efficiency of the printing color scheme, and transferring it to the industry for use by the industry. The main purpose of successful transformation.