Application and development prospect of digital pr

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On the application and development prospect of digital proofing in the printing industry

in the traditional printing process, proofing is the first and very important link. There is no doubt that traditional proofing can achieve the closest effect to the final print, but any technology is not perfect. With the application of inkjet technology in the printing industry, digital proofing is gradually rising, and with its advantages of short process and variable data, it has quickly become a powerful supplement to traditional proofing

here we will discuss the application and development prospect of digital proofing in the printing industry

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I. purpose of proofing

first, let's clarify the purpose of proofing. Whether it is traditional proofing or digital proofing, there are the following three points:

1. Provide customers with standard approval samples: the samples are the finished products of a professional plate making company, It is only when customers sign samples that the utilization and innovation of modified materials in the whole plate making process promote the innovation of household appliances

2. Provide basic control data and standard color samples for printing: only after the customer signs the samples can it be printed on the machine. This is the principle of the printing industry to ensure the accuracy of printing content and quality, and to distinguish between the two sides. It is also the basis for the printing workers to adjust the printing environment according to the needs of the samples

3. Error inspection: through the sample, we can comprehensively check the quality of each process link before printing, and find the existing or possible errors in printing, so as to correct them and reduce the risk of production. Therefore, proofing has the functions of finding errors in prepress operations for users and printing units, providing various types of proofs for printing, and serving as the basis for reaching contracts 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, the shortcomings of traditional proofing

traditional printing proofing, because the consumables used are basically the same as the final print, is undoubtedly the closest to the finished print, but traditional proofing has its fatal shortcomings:

1, proofing takes a long time. Because the traditional proofing process is the same as that of printing, the only difference is the print volume. There are many processes such as prepress rip plate making, plate loading, ink changing, etc., which leads to a long time-consuming proofing

2, uneconomical. On the one hand, because there is no reduction in one process, it consumes a lot of materials. On the other hand, when proofing, the yield is low, and it often takes half a day or even many revisions to produce a sample

3. It takes up a lot of human resources. Generally, traditional proofing requires at least two full-time personnel, one of whom must be at the master level. Generally, it is a teacher with many years of Captain experience who is responsible for proofing

third, the advantages of digital proofing

the emergence of digital proofing is based on the development of inkjet technology. When the color gamut of inkjet is greater than or equal to the printing color gamut, digital proofing becomes possible in theory

what are the advantages of digital proofing compared with traditional proofing:

1. Proofing is simple and time-consuming. With ink-jet printer and color management software, it can restore more than 90% of the printing color, which is easy to operate. It only needs to make a characteristic curve and output a folio sample, which can be done in more than ten minutes

2. Strong color repeatability. Because the inkjet printer itself is relatively stable, the whole proofing process is controlled by computer, which greatly improves the stability and repeatability of digital proofing, which is unmatched by traditional proofing

3. Cost saving. Because the digital proofing process is simple, the resource occupation is very small, and the waste is very small, which is basically zero. Digital operation process, so there is no need for special personnel to be responsible for the operation. Generally, after a week of training, they can be competent

IV. principle of digital proofing

due to its obvious advantages, digital proofing has quickly replaced traditional proofing in the field of commercial printing. So what is the principle of digital proofing? How is it achieved

to realize the color management of digital proofing can be simply summarized into three steps:

1, printer basic linearization

basic linearization determines the physical characteristics under the joint action of paper and ink, optimizes the total amount of ink jet and single channel ink volume of the printer, finds the maximum ink bearing capacity of proofing paper, provides the foundation and optimization characteristics for the creation of printer paper profile, and thus establishes the foundation of color management

in fact, most inkjet printers are not in a linear output state. In addition to the advantages and disadvantages of the proofing medium, the maximum color density value can generally be obtained when the total ink volume does not reach 100%. After that, even if the ink volume increases, the color density will not change significantly, and the working principle of the battery acupuncture experimental machine will even decrease

this leads to the level union when making a profile, so it is very important to basically linearize to determine the maximum total ink volume and single channel ink volume

after the basic linearization of the printer, the part exceeding the ink volume tolerance range of the paper will be ignored, and the chromaticity value represented by the remaining ink-jet range will be evenly distributed, that is, the range of 0%-100% of the printed color block will be evenly distributed to 0%-x% of the ink volume, which shows a linear change in density. The profile obtained by a linearized printer is much better than the hierarchy obtained without linearization

2. Make digital proofing paper profile

based on the produced linearized file and the measured ink volume, print out the color standard plate used to make the paper profile, such as it8.7/3, eci2002, etc., and measure and make the profile in ICC software

3. Match the printer profile and printing profile

after the above steps, only the best matching between a specific printer and media is done, that is, the maximum color gamut of the specific printer and media is known. In order to complete digital proofing, the maximum color gamut and the target color gamut must also be matched. The target color gamut here can be the printing factory's own standard, or international standards, such as ISO standard, or Fogra standard, etc, The color difference between the two gamuts determines the closeness between digital proofing and printing

v. the development direction of digital proofing

previously, due to ink, the limitations of consumables used in inkjet were relatively prominent. Digital proofing can only be completed with specific digital proofing paper, and cannot be printed on the most commonly used coated paper for printing. The gap between media leads to a distance between digital proofing and printed matter, so digital proofing is only applied more in commercial lithography, It is less used in the packaging and printing industry

now there are universal printing inks in the market, such as the water-based universal ink developed by Hongsheng, which can be printed directly on copper paper with the heating device, and the brightness and firmness of the color are ideal, which can fully meet the requirements of digital proofing. In addition, printer manufacturers are also accelerating the development of machines suitable for packaging and proofing. For example, Epson and Mimaki have launched white ink printing machines respectively, and some manufacturers have used UV drying technology to meet the market demand to the greatest extent

in a word, whether it is the coated paper printing scheme using water-based universal ink launched by Hongsheng or the digital proofing realized by other inkjet methods, it is bound to greatly promote the use of digital proofing in the printing industry and inject new vitality into the traditional printing industry with a long history. It is expected to be by the end of October this year

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