CFS complex spectrum ink color matching system
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In some prints such as trademarks, certificates, packaging, etc., customers sometimes have high requirements for a particular color, which is overprinted in cyan, magenta, yellow, and black, or often because of one of them. The amount of ink in the color changes, so that the printed color also changes; or the target color is not printed at all. In this case, in order to ensure the stability of the print quality and anti-counterfeiting requirements, customers often require the use of spot color printing. The so-called spot color printing is to print the ink that is prepared according to a certain ratio of certain colors of ink for the color specified by the customer, and print it on the printing machine at one time. Because this color is pre-adjusted by the printing company according to the color and brightness (whiteness) of the target color specified by the customer, and it is printed in one place, it has no jagged interference of printed dots and the edges are neat. The color is stable. The big red color on the trademark of Beijing Red Star Erguotou Liquor is printed by spot color printing.
Obviously, the key to spot color printing is not printing, but color matching. Today's color printing companies generally set up special personnel or departments to engage in artificial color matching. Artificial color matching is based on the visual inspection and experience of workers. Some spot colors require multiple deployments over a long period of time, which is time-consuming and labor-intensive, and greatly increases production costs. It is a relatively backward color matching method. At the same time, the brand, model, production batch of the ink, the whiteness of the paper, the color, the pressure and speed of printing all have an impact on the accuracy of the spot color ink blending.
With the continuous development of computer technology, in order to solve the above problems, computer color matching has gradually entered people's field of vision, and has received much attention. In the printing, printing and dyeing, paint, paint and other industries, there are research and development institutions engaged in computer color matching at home and abroad. However, the current computer printing ink color matching system is often based on a certain brand of ink, it takes many years to establish a basic ink database, and the workload and capital investment are unimaginable. Therefore, its products are inevitably sold at a high price, and there are strict requirements on the choice of ink brands in the enterprise, which inevitably increases the production cost of the enterprise.
In order to make computer color matching technology popular in the printing industry as soon as possible, and to serve the printing enterprise as the purpose, in order to reduce production costs and improve work efficiency, China Printing Science and Technology Research is based on the independent innovation of complex spectral chromaticity theory, after years of research. Developed a simple and easy "CFS complex spectrum ink color matching system".
Modern color science theory was founded in the 19th century. By the 1920s, a number of scientists selected different wavelengths of red, green, and blue monochromatic light for matching experiments, and proved that any natural light color can be matched by these three basic colors. On this basis, the International Commission on Illumination (CIE) introduced the "standard chromatic observer XYZ tristimulus value" in 1931, which laid the foundation for today's CIE chromaticity theory.
The theory of complex spectral chromaticity is based on the volatility and quantum of light. Based on the integral transformation formula of neural signals, the wave equation of electromagnetic waves, and the photon momentum formula of Einstein, the pure physical concept from light to color is derived. Complex spectrum chromaticity calculation formula. A detailed discussion of the theory of complex spectral chromaticity - "The analysis of the complex color spectrum of light color conversion" was published in the fourth issue of the Journal of Beijing Institute of Graphic Communication in 2007.
According to the new color-color transform complex spectral chromaticity theory, the two-dimensional complex chromaticity map is used to replace the three-dimensional color space of CIE chromaticity theory, providing CIE xy chromaticity coordinates, dominant wavelength, color saturation, brightness, Lab At the same time, new color characteristic values such as main frequency, hue, color intensity, and whiteness (color balance) are also given. The hue of the color corresponds to the frequency of the light on the complex spectrum; the brightness of the color and the area enclosed by the upper end of the complex spectrum, that is, the energy of the light; the color intensity of the color corresponds to the momentum of the photon; the color of the color The degree of balance corresponds to the white light content of the total amount of light in the complex spectrum. The color is evaluated by complex spectral chromaticity, and neither the tristimulus value of CIE nor the red, green, and blue color filters are used.
The complex spectral chromaticity measurement method is physical, and the evaluation is objective, which is conducive to the establishment of a completely objective physical color evaluation system.
The natural world is full of colors and colors. The color scheme is to select only a few or even a dozen colors as the basic colors, and use them to match each other to modulate a specific color. However, since the printing ink is a reflection color, it is not a random color that can be used as a basic color. The conditions suitable for the basic color are: 1 color gamut is wide, and the reflectance is high; 2 the two basic colors adjacent to the hue have a wider common response frequency domain; 3 have a higher color intensity in it The lower the reflectance of the complementary color domain, the better; 4 It should be reasonably distributed in the four spectral regions of the complex spectrum red, green, cyan and blue. The two adjacent basic colors should not be too close or too far away.
Theoretical innovation will inevitably lead to technological advancement. The CFS Complex Spectrum Ink Matching System features a powerful, fast, ink-compatible printing ink color matching engine. It is based on the basic color ink database established by the company itself. Through the measurement of the target color, combined with the price and inventory of the basic color ink of the company, it uses “quick color matching”, “precise color matching”, “strict color matching” and so on. A variety of color matching methods, such as "optimal hue" and "lowest cost" and other sets of color matching schemes, so that enterprises get rid of complicated and expensive trial and error, greatly reducing the production cost of enterprises. The characteristics of the CFS complex spectrum ink color matching system are:
• Independence with ink brands – Based on a new theory, using scientific calculation methods, the color matching system is adapted to the printing inks commonly used by enterprises.
• Reduced printing production costs – with an accurate and fast color matching engine that frees companies from tedious and expensive trial and error.
• Newly added color difference content - In addition to providing ΔE, there is a more specific calculable color difference ΔH, luminance difference ΔL, and color saturation difference ΔS.
• Unique color difference correction scheme - Provides an operable color difference correction scheme based on measured and calculated color difference parameters.
The advantage of computer color matching is economical, fast and accurate, which is incomparable with artificial color matching. The CFS complex spectrum ink color matching system developed by China Institute of Printing Science and Technology, the theory is independent innovation; the calculation method has obtained the national invention patent, which is accurate and reliable; the operation method is in line with the usage habits of Chinese users; the price is reasonable.