The digital production process makes the data flow and control flow in actual production not as intuitive as the traditional process. What we see is only the input layout elements, the layout information expressed by the display device, and the final output color digital proofs and CTP printing plate. The operation information exists in the form of data. Any small mistakes or errors will cause the failure of data transmission or abnormal output results, and will also exceed the control capabilities of the operator. It is difficult or impossible to check the problem, so these variables become Uncontrollable factors in the prepress operation. In order to ensure the correct and smooth flow of data, we must find a set of practical data flow control methods.
In the production of the printing industry, there are two types of information flow for printing jobs, namely "graphic and text information flow" and "production control information flow". The graphic information flow solves the problem of "what to do"; the control information flow solves the problem of "how to do" and "what to do". In the digitization process, both types of information are digitized, and both can be recorded, processed, and transmitted by the computer. The control nodes of the data flow in the digitalization process are file pre-check, printout, PDF normalized digital layout, and output after RIP.
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