Pre-RIP proof traps - principles and methods of digital proofing
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Today's publishing and printing field, based on modern computer and network technology, marked by digitalization, production technology and technology have begun to change from traditional analog or analog-digital hybrid process to new digital production process, and gradually to high quality and high. Efficiency, high dynamics, real-time and personalized production processes. Therefore, how to meet the requirements of various printing methods, printing conditions and color proofs of printing products in the shortest time and optimized method has become the bottleneck and research hotspot of the quality control of publishing printing production process.
First, proofing and its role
Proofing is a key link between prepress and printing in the printing production process. It is an important means of quality control and management in the printing production process. It is extremely important to control printing quality and reduce printing risk and cost. Proofing can be used as a post-press post-process to test the effect of pre-press platemaking, and can be used as a pre-printing process to simulate printing for trial production, seeking the best matching conditions for printing and providing ink color standards. Therefore, proofing can not only check the errors that may occur in the process of design, production, filming, printing, etc., but also provide production basis for printing, and become the acceptance criteria of users.
In the actual printing production, the acceptance criteria of the final effect of the printed product are reached with the customer before printing, which avoids the printing error of the content, reduces the risk and cost of printing, and ensures the printing quality is of great significance. So the role of proofing is:
(1) Provide customers with standard approval samples: Samples are the finished products of a professional plate-making company, and the customer sign-off marks the completion of the entire plate-making process.
(2) Provide basic control data and standard color proofs for printing: “Only printing can be done on the machine after the customer signs the sample” is the principle that the printing industry ensures the accuracy of the printed content and quality, and distinguishes the responsibilities of both parties. Samples need to be adjusted for the printing environment.
(3) Wrong inspection: Through the proofs, the quality of the pre-press process from the original to the film can be thoroughly checked, and errors that have occurred or may appear in the printing are found, so as to correct the errors and reduce the risk of production.
Therefore, proofing has found errors in prepress operations for users and printing units (1); (2) providing various types of proofs for printing; (3) functions as a basis for contracting with customers before printing. In short, the key to proofing is to simulate the printing effect, find errors in prepress work, and provide relevant standards for printing.
Second, digital proofing and its characteristics
At DRUPA In 2000, a number of publishing and printing production solutions based on computer and network technology were launched, marking the beginning of the traditional publishing and printing industry. Digital proofing refers to the new proofing technology that directly prints color proofs according to the publishing and printing production standards and specifications in the process of publishing and printing based on the digital publishing and printing system. The general process of digital proofing processing is as follows:
It can be seen from the flow chart of the text that digital proofing is a key process link in the digitalization of the publishing process, which directly restricts the quality of the production process and product of the publishing and printing.
1, the principle of digital proofing
The working principle of digital proofing is different from the working principle of traditional proofing and printing. Digital proofing is based on the digital publishing system (CIP3/CIP4), which uses the same page graphic information (RIP data) to reproduce color graphic information from computers and related equipment and software, and to control the quality of the printing production process. At present, the digital proofing system consists of two parts: digital proofing output device and digital proofing control software. Among them, digital proofing output equipment refers to any color printer that can output digitally, such as color inkjet printer, color laser printer, color sublimation printer, color hot wax printer, etc., but currently can meet the printing speed and format of publishing printing requirements. Large-format color inkjet printers such as HP5000/120, EPSON7600/9600, ROLAND, ENCAD, etc.
NOVAJET and so on. Digital proofing software includes RIP, color management software, layout, control data management and input and output interfaces, etc., mainly to complete the digital screening of the text, page flattening and splitting, ink gamut and printing ink gamut Matching, data saving of different printing methods and processes, exchange of data between various devices, etc. Digital proofing software is the core and key of the system, which directly determines the process of digital proofing to replace the traditional proofing.
Since the digital proofing adopts digital control, the equipment is small in size and low in price, so the requirements for the knowledge and experience of the proofing personnel are lower than the traditional proofing process, and it is easy to popularize and popularize.
2. Process and characteristics of digital proofing
The process of digital proofing is: making a page electronic file - RIP - digital proofing. The operating procedure is: the system sets the acceptance of the electronic file - the large version selects the proofing material - digital proofing. Digital proofing and playing a set of four-color version only takes 15-30 minutes. A set of digital proofing software can control the productivity of multiple digital proofing machines. The characteristics of digital proofing are different from the printing method of the flat proofing circle of the traditional proofing machine, and different from the printing method of the circular pressing circle of the printing machine, but based on the color rendering range of the printed color and the same RIP data as the printed content. The use of digital proofing large color gamut space to match the printing of small color gamut space to reproduce the printing color, without any conversion can meet the requirements of flat, convex, concave, soft, net and other printing methods, according to the actual printing of the user The situation to make proofs completely solves the problem that it is impossible to combine the subsequent actual printing process to bring printing difficulties.
3. Quality control of digital proofing
The quality control of digital proofing adopts the data measurement method of control standard (such as IT8) and density meter (spectrophotometer), focusing on the restoration of up to 928 color areas, which is far superior to the field density of traditional proofing control, 1%. , 2%, 15%, 50%, 75%, 98%, 99% dot reduction, etc. It also greatly facilitates the operation of workers who use the magnifying glass to view the dot shape to judge or control the quality of the proof or print in the prepress and printing of color offset printing in China, especially to reduce the quality and experience of personnel and improve the control. The accuracy of the data.
4. Comparison of digital proofing and traditional proofing
Due to the integration of the latest theories and technologies in the field of publishing and printing, digital proofing has the following advantages: (1) advanced technology and strong adaptability; (2) fast speed and low cost; (3) stable quality and good repeatability (4) Convenient operation and high reliability; (5) Adapt to the development of new technologies and good openness; (6) Comply with the technological advantages of CIP3/CIP4.
In short, digital proofing technology is an emerging technology and a key part of modern digital printing production processes. Digital proofing technology will be continuously understood and accepted by users, and will be continuously improved in the use of users. It is foreseeable that digital proofing will eliminate traditional proofing in a certain period of time, create new value and benefit for users, and lead users to move from the analog era to the digital age.