The core of ctp technology

In today's information age, computer technology is changing with each passing day, and the performance of software and hardware platforms continues to increase; various technologies in the prepress area of ​​computers are also making rapid advancement. Various new types of output devices are emerging in an endless stream. Graphic processing technology is increasingly mature. The printing industry is moving from analog production methods to digital production. Way transfer. The Computer to Poate (CTP) technology is one of the hottest topics in DRUPA, IMPRINTA97, PRINT97, and the upcoming IPEX98 and other prepress fields. In the developed countries of the foreign printing industry, CTP technology has been widely popularized and is still in the ascendant; China's printing industry is firmly grasping this trend. Under the organization of the State Economic and Trade Commission, the Great Indian Association, the Newspaper Association, the Institute of Printing Research and the Founder of Peking University Others actively work and hope to promote this emerging technology and introduce it to a wide range of industry users.
There are many topics related to computer-to-plate making. Here, I would like to introduce to you the technical status quo of RIP (Raster Image Processor), the core of the CTP system, and a brief overview of future developments.
In the desktop publishing system, RIP plays a decisive role; it is no exception in computer direct-view systems. From a simple point of view, the task of RIP in a computer-to-plate system is much smaller than that of RIP in a desktop publishing system. It is only a transition from the original connected laser imagesetter to a direct plate-making machine. The only change is the device-driven part. . But in fact, the computer-to-plate system is a revolutionary change for the entire pre-press field; the all-digital workflow is quietly becoming a new trend in prepress technology!
Let's first look at some of the major goals of a computer-to-plate system:
1. We hope to increase the speed of plate making through the CTP system and increase the productivity of the workflow;
2. It is hoped that the process of plate making will be reduced through the CTP system, which will save money;
3. Hope to improve the quality of finished products through CTP system;
Summing up the CTP's task is: more fast province! That is, using the cost of the most “provincial”, producing more “more” quality and “good” finished products at the “fastest” speed, which may be the goal that every pre-press field user dreams of.
The computer-to-plate system is constantly moving toward this goal. However, these goals pose serious challenges to the RIP technology, the core component of the CTP system.
(1) Because the CTP system does not need to output the link of the film, the traditional process of manually trimming the imposition of the film must be completed automatically by the CTP output system; for example, the Imposition (also called imposition), or even built in the RIP. In RIP Inposition function becomes necessary;
(2) Since the CTP system no longer outputs film, proofing (printing) before printing is a necessary part of the prepress process, which requires the development of a CTP system without a film proofing system, that is, a digital proofing system; and the key to the digital proofing system. The technology lies in the color management system;
(3) The finished product quality requirement of the CTP system is higher (the traditional printing process can not compensate for the prior process can not be implemented in the CTP system), and the plates of the direct plate making system are more expensive, therefore, the quality of the plate making is to improve the CTP system. The key to quality and cost saving is that for CTP RIP, the processing of text, graphics, and images, including rasterization, image trapping, trapping, etc. Requirements;
1. The CTP system is required to increase the speed of plate making and improve the efficiency of the production process. In general, the direct plate making equipment is matched with the printing environment and the output format is relatively large. Four open, open, full open is a common format, which also put forward higher requirements for RIP output speed;
2. The CTP system has a high degree of automation, and many quality links need to be controlled. The development of an integrated automatic process management system to reduce errors and improve production efficiency has become an increasingly urgent requirement.
From this we can predict the future development trend of RIP in CTP system:
(1) Support for the latest PostScript version: PostScrip3: PostScrip3ZAI PostScrip Leve12 adds the following:
Trapping (In-RIP Trapping)
Smoonth Shading
Various formats of text support (Font)
Enhanced Device Control (Device Setup);

In line with PostScript 3, RIP will provide direct support for trapping, gradients, and high-fidelity colors, enhancing the ability of typesetting software to describe complex fancy layouts, and RIP's ability to output complex gradient layouts;
(2) Support the latest portable file format: PDF (Portable document Format);
(3) Support the latest software and hardware platforms (such as 64-bit hardware platform and Windows NT5.0, etc.), maximize the performance of the operating system platform, improve RIP output speed; provide cross-platform support capabilities, not only can handle Mac, PC platform output Tasks, while accepting output requests from other platforms such as UNIX;
(4) Support PDF as the core of the automatic output process management system, development and improve system reliability, operability and productivity;
Support Preflight function for printing tasks;
Supports intelligent assignment between multiple RIPs and output devices, increasing system throughput;
Allows the user to query the status of the output system (print tasks, RIP, and output devices);
Support users to remotely monitor the output system (print tasks, RIP and output devices);
Provide reporting capabilities;
Support OPI;
Supports hierarchical management of system permissions to improve reliability;
The above points are common trends for all RIPs (including RIPs applied to the CTP system).
(5) Supports RIP separation (In-RIP separation);
(6) Supports In-RIP Trapping;
(7) Support for RIP Imposition;
(8) Extensive equipment support capabilities;
It supports mainstream output devices in the local market, providing users with greater flexibility and choice in configuration systems, and maximizing the use of the functions provided by the system.
RIP integrates seamlessly with the overall solution of the CTP system, supports digital proofing systems, supports color management systems, supports automated process management systems, etc.; one of the key points of the all-digital workflow is color matching between image input devices, displays, and output devices. Cooperation, that is, the development of color management system;
Develop multi-functional RIP, from low-end black and white proofing equipment, color digital proofing equipment to high-precision direct plate-making equipment can be driven at the same time, give full play to RIP performance; at the same time ensure a high degree of consistency of various output results within the system, reduce the chance of error;
Support multiple RIP multiple input functions to further improve system efficiency;
Develop new network technology to output high network cables with low resolution and save output time.
Support more friendly man-machine interface and remote monitoring RIP capabilities;
The technological revolution of the all-digital work flow will inevitably lead to the full investment of various companies and research institutions in the prepress industry, and new products will be produced. I wish my country's all-digital workflow will be popularized soon and promote the printing industry to flourish!

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