If we print one kind of color box in one printing house, it is relatively simple to keep the same quality, but if a color box is printed in many, many locations, many machines all over the world, how can we keep their quality uniform? So in order to ensure the quality of each batch, each piece of equipment to print out, we can only follow the standard.

　　There are many factors that affect the final color of the print, such as the different printing platforms, the color reflection will be different; to the printing service provider of the electronic file color management format is different, will also affect the final printing color. In addition, each printer's dot expansion rate is not, the quality of each enterprise publication is not uniform, the use of ink brand color gamut is different, paper is different, different settings of the measuring instrument ...... these will affect the final effect.

First, the color conversion platform

　　When customers give us RGB files need to be converted to CMYK, we are converted by what means? If we turn each of the process used in the standard are not the same, then the color of the converted CMYK file will be? Similarly, even if it is the same file, we through digital printing, offset printing, gravure printing and other different printing methods, the color of the printing can be different. So how will we go to unify and solve these problems?

　　At the 2009 International Printing Standardization Forum, AISI proposed the idea of CxF, Color Information Exchange Format, which is an html-based language for describing the conversion of a color between different platforms. It came out to help us solve the problems we encountered in color conversion. As long as you define the file well, the color will come out the same. Currently in our use of PDF/x -4: 2010 documents, has been embedded in the file CxF. That is to say, when we receive the file is a PDF/x -4 version of the time, it shows that it is already available in many printing platforms for free conversion.

Second, the file conversion

　　When the source of the manuscript reached us in the hands of the total number of dots in the color separation when we determine how much? What kind of mesh we use? We use to join the trap and UCR/GCR? Because the total number of dots is not the same may affect the final printing results, in addition, the different screening technology makes the different mesh type of the mesh expansion rate is different. That is to say, in the ideal state, if today's corporate Kodak's CTP equipment can not work, when you use Heidelberg's CTP to publish, there may be a certain amount of difference in the final print color. And the defects of these, is that we can not compensate for this part of the printing.

Third, the different equipment

　　Printing process is complex, not only the ink balance, consumables and substrate differences will also greatly affect the final printing quality unity. And the above are all able to see and familiar with the impact of factors, in fact, there is a potential in the printing process is not valued by the people of the factors are: equipment to expand the rate of dot.

　　In fact, the printing equipment of each printing company's dot gain rate is not the same. That is to say, even if you give you the same set of plates, the same substrate and supplies, printing on different presses may not be able to get similar prints. How to solve this problem?