Research Of Map Reducing Plates Printing Technology

The color is one of the important formats of map, the map printing requests high quality of colors. Map publication not only requests to have abundant color, also requests each color accurate, and be up to standard. Now, the kind of map which is printed with Black, Brown, Cyan, Green, Red, Purple is the representative map among the printing maps. Thematic maps also use a lot of spot colors. These color plans were made in the condition of traditional technology of map reproduction. The maps printed with a lot of spot colors will cause excessive printing plates and high cost of printing. And today, the map printing has already carried out total digital production, especially the usage of four colors printing machines, change the map produce of task appearance. So this paper reviewed the forming historical background and limitation of map spot color printing, analyzed the inevitability and feasibility of printing maps with four colors rather than more than four colors so as to reduce the map printing plates in the digital publishing technology conditions, designed several printing color-setting projects and approved it with experiment, then concluded the new color using mode of map printing. The main content of the paper is as following:1. The paper reviewed the forming historical background and limitation of map spot color printing and summarized color mixture theory,the expression method of colors,common color system and the basic theories about color. I collected and sorted the maps. And on the basis of the basic theories about color, I analyzed the colors of the maps and summarized the characteristic and the principle of the maps' colors. This enriched the theories of maps' colors.2. The paper elaborated the inevitability and feasibility of printing maps with four colors rather than more than four colors so as to reduce the map printing plates, in the digital publishing technology conditions. The paper also put forward four colors sprinting standpoint and drew up a set of four colors plans of maps to reduce the map printing plates, aim at well exerting existing printing equipments of the technique potential and ensuring that the map printing has the high quality printing products efficiently. Then I did experiments to approve the inevitability and feasibility of printing maps with four colors.3. I made the color standard of four colors printing and build color database of four colors printing, basing the color data of the color standard. The color database can provide different color plans of different kinds of maps to the people who are cartographic designer, so as to use conveniently. And the color database organized the color data logically to use and manage data conveniently. Basing this, I put forward directive theory and technology to the cartographic design and printing colors. 4. The paper drew up a new color plan of republishing maps. The plan can ensure that the map printing has the high quality printing products efficiently and improved the technical methods of republishing maps.The research and experiments above sufficiently proved the inevitability, feasibility and urgency of four colors printing. The paper drew up color plans of four colors printing with the precondition of ensuring high map printing quality and build color database of four colors printing so as to give directive theory and technology to the cartographic design and printing colors.