Study On Theory And Experiment Of Color Matching

With the development of information society, people's need of slap-up and high quality packaging products is more and more. Numerous consumers were attracted by the particular trademark effect of packaging products appearance color and enterprise image logo color. Nowadays, many internal and external experts have done much research on computer color matching and obtained many fruits. But there are two main problems which are high cost in algorithm and large color difference. The color matching algorithm was the main study object. Aimed at the two problems, the thesis's purpose was to put forward a kind of color matching software with low cost and small color difference. This software can provide theory and technique foundation for color matching. The results would make the spot color of packaging products consistent, unify the enterprise trademark image and enhance the enterprise's competing power.The study methods: First, the design rationality of color matching algorithm was analyzed with colorimetry and ink theory in plane color space. Then, the database characteristic was acquired from experiment. Furthermore, color matching experiment was finished by IGT simulating traditional offset. Lastly, the formula color was analyzed with metamerism index and subjective and impersonal method after the formula was got by coefficient analysis, non-linear regression analysis and Spline interpolation method.The main works: (1)The function relation between pure ink color hue and domain wavelength was obtained by theoretic and experimental study, a kind of new computer color matching algorithm was brought forward. (2) The color matching software was programmed with Delphi by combining colorimetry theory with Spline interpolation method. (3) The relation between practical primary ink thickness and solid density was proved, the parameters have made certain. (4) After color mixing experiment was finished, the experimental result was evaluated by synthetical methods.The conclusions: (1) Color matching was completed in plane color space which decreased the data quantity, reduced the color matching system time cost. Calculating formula needed 12～500ms. (2) One certain color was often corresponding with more than one spectral reflective curve from the function relation formula between hue and domain wavelength. The result coincided with the conclusion that metamerism was used to spot color matching. (3) The parameters were gained through the relation experiment of practical ink thickness and solid density. (4) The minimal color difference was 1.6211. The minimum has increased 46% comparing with the minimum of fine print product, which satisfying color appearance demands of high-quality packaging products.