Digital proofing

Written by: Chen Xiuqing

The emergence of digital technologies such as computer-to-plate (CTP) and computer-to-film (CTF) has created market demand for perfecting digital processes to replace existing production methods. The digital process involves computer imposition, cost control, production management and other issues. The scope is very wide. Among them, digital proofing is the most talked about and concerned. From the beginning, the industry was skeptical about digital proofing, and it is gradually accepted and adopted today. It has undergone a transition period of several years. In theory, if the quality of the equipment is good, the stability of digital proofing should not be in doubt. However, there are many factors affecting digital proofing, so until now, digital proofing, which seems to be no longer unfathomable, still needs to be discussed again and again.

On March 18, the Printing and Publishing Industry Training Committee of the Vocational Training Council and the Printing Technology Research Center organized a seminar called "Aspects of Digital Proofing Schemes" in the Vocational Training Council Building, inviting users and speakers to join hands with those present Share opinions and experience of digital proofing.

Is the digital proofing color accurate?

Brilliant plate making She Wencheng: As far as people know, digital proofing seems to be accurate in color, but in the printing house? Ren Mentoring τ Lemon Bao? Chun Shengluo talk about spring? Choose 4? Stir-fry? 懿 春 僖 蛩 缢 缢 ?? Jiao ⒒ fat was presented? Taken ⑽ exposed magpie throwing posture ?? smashed? Spectrum glutinous lotus drama? 娓 竦 thumbfly ?? Xian Muyi suffering from 軻 ァ H 绻? 瑤 譤 spectrum glutinous inquire ɑ oyster blind 竓Thumbfly ????] May make a good ICCProfile. Even if I can do it, ICCProfile cannot accurately describe the characteristics of the instrument because of changes in the environment, differences in the skills of the operators, or some variables that occur when making plates and outputting films. This is what we often encounter. difficult.

GretagMacbeth Guo Jianquan: Stable production conditions are very important for color management. However, color management is only one part of the entire production management. It does not mean that color management has been done, and the rest need not be ignored. In fact, the company's quality management also includes: Is the consumables stable? Is the entire production process standardized? What is the density of printed matter and the added value of the dots? What are the characteristics of printing?] Have been identified and so on. The printing house must first set a standard, and only then can it take samples to take readings to measure how far it is from the standard. With this standard, it is expected to maintain the stability of proofing colors. When everything is stable, the color management you make can take effect. Color management involves a wide range, ICCProfile (color profile) is the most important part, it is a file describing the characteristics of the instrument. If the characteristics of your instrument are erratic, the description file will become invalid. Because the description file may describe the characteristics of the instrument yesterday, and today's characteristics may be 5-6% different from yesterday, so that the expected accuracy you get will be 5-6% different. But how can the production process be stabilized? In fact, it also needs to go through another management that involves a wider range, including acetylene can be recruited? Ā⒏ ?? 捅 V ぁ? / P>

X-Rite Chen Guowei: In addition to CMS (color management system), the line? Seize tom? MS (quality management system), to make a good ICCProfile, you must control the instruments, paper, ink. Making a printer's profile is easier than making a printing machine. Because the latter involves areas such as ink-water balance, blanket pressure, and color gamut of each set of paper and ink, it is necessary to control these variables before making an applicable ICCProfile. If only the first half, such as the quality control of the screen and scanner, is made, but the second half cannot achieve high standards, the color display of the entire process will also be affected.

Do ICCProfile need to be updated regularly?

Brilliant plate making She Wencheng: Because we are selling colors, the biggest difficulty in daily operations is chasing colors. The color gamut of digital proofing must be wider than the color gamut of printing, even if the digital files we made are not handed over to the printing company, let us first write the worms ???? Peach silkworms and pure leeches? Kryptonus? Na? 蛱? 憷 ?? Truffle? Difficulties? Xia Yan punishment? From the fresh? Krypton? Mou Yanwei? Ighlight and Shadow part is particularly outstanding, the performance is particularly good. Based on the structural problems of the printed dots, these levels are not easy to perform well.

X-Rite Chen Guowei: Two methods that are currently feasible are: use screen to simulate the effect of digital manuscripts; or use digital proofing to simulate the effect of printing presses. Now your customers? 艋 dai 窕 ǘnoisy ┳try? 鲆 桓 鲇 ∷⒒ ?? rofile let you follow?

Various measuring instruments on the market can help improve the accuracy of digital proofing.

Brilliant plate-making She Wencheng: Have 1 guest? Sorry? Lucky? Pro? CCProfile, but the problem we encountered is: We did it, followed the color well, but after giving ICCProfile to the printing house, they But couldn't keep up. Two months later, the profile was returned by ourselves, but we couldn't follow it. Why? Because time has brought many changes. In those two months, everything has changed a lot. The trade-off is to update the ICCProfile almost every week or every month, otherwise it will not be easy to chase. Even if the same batch of paper and the same batch of ink are used in different periods, they will encounter the same problem.

X-Rite Chen Guowei: With ICCProfile, there is finally a standard for you to chase. If ICCProfile is not given to you, you can only judge at will, and even the most basic conditions cannot be mastered.

GretagMacbeth Guo Jianquan: In fact, the key lies in the management of the printing press, including the temperature, humidity control, paper and ink of the entire printing room? ∷⒊в? Yneconn: ∷⒈Yaonao? The printing machine should be stable. But of course it is also necessary for the printing house to submit data to prove its stability. In fact, the plate-making company can regularly print to the manuscript printing factory to check whether the data of the value-added and density of its dots are stable. It can even draw a trend chart on the data for reference, or study with the other party to find a coordination plan with each other.

Color correction software helps users to establish reliable ICCProfile.

Sometimes, we will find a virtual printing machine ICCProfile. Whether it is digital or screen proofing, even the printing press may be chasing the virtual printing press characteristics. Of course, this is only a transitional stage, not an ideal one. But in actual circumstances, it may be useful. Of course, this virtual printing machine ICCProfile must also be able to keep up with the printing characteristics that can be followed by the local or used printing plant, including ink hue, paper physical data, etc.

Can ICCProfile help to expand the color gamut?

Ask the audience: If I make the ICCProfile of the printing press by myself, can I use the canned ICCProfile to describe the status of the printing press?

GretagMacbeth Guo Jianquan: Canned ICCProfile should not be used to describe the status of existing printing presses, because ICC describes certain characteristics, such as forcibly changing the Profile to distort the characteristics it represents, it should not be an ideal practice.

Ask the audience: But if the characteristics of the current printing press are not in the best state, there is now a certain feature that allows me to use the method of ConvertProfiletoProfile? Unreliable? Dream industry scratch: ✒? Chong hydrazide cough? B ???? ⒒? 髡? The material is intriguing? CCProfile status, the printing machine must be adjusted to achieve the maximum color gamut, is it not a waste of time? Is it the ultimate goal to achieve maximum color gamut?

GretagMacbeth Guo Jianquan: Of course, the long-term goal is to reach the maximum color gamut, but in the short and medium term, for example, in the case of delivery, if the printing press can be kept to a small color gamut but the state is stable for about two weeks, you can use this moment ICCProfile as a set standard, the problem is not big. The color obtained in the future may not stop, stop, stop, stop, post, post, and mail, the question is gone, because the most important thing is delivery. Of course, the long-term goal is to do color correction and establish it? Alkyne survey traces? 髽 惚 隳 鳳?> Reef? 唽 ┑ ァ 5? ? ∷⒒ ?? Wan Lao ?? 銀 進 鑑 鑲 奈奈 ??? CCProfile, is not good. In the process, the most important thing is: don't rely on the naked eye or human judgment, but use the instrument to measure.

X-Rite Chen Guowei: I can't rely on ICCProfile to expand the color gamut of the printing press. Each paper and each set of ink also has its own color gamut. If you want to expand the color gamut, it is recommended to buy some higher quality paper and higher purity ink. Determine the printing conditions such as water-ink balance and blanket pressure are all in the standard state, which can naturally reach a larger color gamut, and then ICCProfile can be used to explain the size of the color gamut that can be given to the printer by adding a certain paper and a certain ink combination .

GretagMacbeth Guo Jianquan: If you change the ICCProfile to expand the color gamut, or the color may exceed the estimate, and there may be problems with the gradient tone? R, it may not be beneficial.

One profile, 20 printing machines?

Ask the audience: ICCProfile is indeed a confusing question. In particular, the printing environment involves more than ten variables. If more than ten machines are added, multiple standards must be set. With so many variables, such as ink, speed, ink type, pressure, etc., how can I ensure that the ICCProfile used meets the standards?

X-Rite Chen Guowei: The printing press's profile does require a lot of time and resources. Unlike printers, it is possible to use only ordinary book paper, glossy paper, and photo paper. The ink is also EPSON ink. There are a lot of variables in printing presses, such as printing presses in Japan or the United States, or paper in the United States, South Korea, and the mainland, plus inks of different purity, different printing master operations, etc. All factors add up, how to ensure each The project is also consistent and conforms to the standard? It is indeed a challenge. But ICCProfile also has its existence value, the value is not worth investing in so many resources, it depends on the strategy of each company.

The accuracy of digital proofing involves color management and the use of measuring instruments. It is worth investing or not, depending on the company's strategy.

To achieve the maximum color gamut, it should be aided by instruments and software, and should not be judged by the naked eye.

GretagMacbeth Guo Jianquan: A printing factory may have 20 printing machines, but the brand may only have four or five. Three or four machines of the same brand must at least pass the TestForm test. TestForm needs to be measured with a spectrophotometer. After the measurement, statistical data can be obtained to know how much the average deviation (Deviation) will be obtained when a certain printing machine uses a certain type of paper. Then we can pass the acetylene anti-fluoren ?????? 畹 木 嗬 鸾 郾 ダ ??? arrogant? 匦 院 螅? 鹦 鲆 顓 鍪 as a mischief called release apple? CCProfile. Of course, it is theoretically possible to use an ICCProfile for the entire company's 20 presses. But in the printing process, it is inevitable to chase the proofing color. Regardless of whether each printing machine of the company also has a Profile, or whether a Profile covers twenty machines, the effect of digital proofing will be affected by the Profile, and printing should also closely follow the proofing. If your four brands of the same machine use different profiles, I believe its accuracy will be quite high. If you use a Profile to represent twenty printing presses, you will inevitably have some sacrifices, but you have sacrificed the accuracy, maybe you can? It will simplify the operation and save time. How to choose depends on the printing plant? Q deal.

Ask the audience: Will you consider introducing some standard profiles to us so that we can save more costs?

X-Rite Chen Guowei: Whether it is an EPSON or hp printer, a canned profile will be attached randomly. Canned Profile has told you how much the color interpretation ability of a certain model of a certain type of ink and paper. But if it is a printing press profile, the difficulty seems higher. There are so many types of printing machines on the market such as Heidelberg, Manroland, etc., so many kinds of paper, ink, so many different operators, how can we ensure that the can profile we make must be completely suitable for your production environment? Perhaps your press settings are different from mine, and as long as there are variables in this area, it will basically directly affect the accuracy of the Profile. The proposal to make a canned profile is very good, but in fact it may not be possible to complete a representative profile.

GretagMacbeth Guo Jianquan: X-Rite and GretagMacbeth software, there are several canned ICCProfile. To be a local representative profile, the costs involved are not affordable for small companies. These profiles are made by the European printing associations and national groups. Of course, Hong Kong can also try to work in this area, but even if a profile is made, it will not match the printing machine of any printing plant, nor will it describe the characteristics of a certain printing machine. The result still depends on digital Proofing and screen soft proofing simulate the so-called national or Hong Kong standards, and then the printing house holds the proof and color. Fictitious national standards exist, and the difference should be resolved if the printing house can catch up.

Is digital proofing costly?

Mr. Pan Zhiwen from the Commercial Press: Since the rise of CTP in 1998, we have begun to use digital proofing. Why did we start so early? Because when we use traditional proofing, we see that paper and master will affect the final effect of proofing. Sometimes we need to publish more demanding books, and tried to match the color once. We pointed out that the result was corrected after the proofing, but the film was modified?] It has been modified, but it is actually just a little bit heavy when proofing. In 1998, a lot of customers? The quality of the screen? The screen? The? The? The wall? The wall? The egg is changed to a rose? E. Printing house printing, the color will not match. Another important point is that our requirements are quite high. If we keep changing colors, the cost will be high, but if we change the digital proofing, we can reduce the cost.

We started printing CTP books in 2000, and our level of color processing is still quite low. We have used digital proofing for four or five years, but now the digital proofing handed to me by the plate-making company, IMHO, is actually still far from the printing effect? For ordinary printed materials, we can also adjust ourselves according to the gap. However, some cultural relics, murals, and other highly demanding prints are submitted to the original authors such as photographers and museum directors for proofreading, and most of them are considered to be out of specification. So when we deal with this type of manuscript, we will first use traditional proofing for the first time, after the other party has read it, after giving the opinion, we make "acetylene health food J Bao? 把 嵊 桊? Krypton? Earthworms? χBenzene glaze chatting spring leisure model? Tong 咭咭? 韮 姆 child? 怼 N Yi sheath pro-momentary model? Arashi? 焓 芑 ㄌ? Pyridine test group consultation? 芾 矸 correct? / P>

In order to help the customer? What is the urgent judgment model? Di words 沊 岽? Stir-fry? Foggy? Krypton? Can you? / P>

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TechwayTechnology Chen Xiaoxian: Digital proofing has developed rapidly in recent years, and its stability has also improved a lot. At present, the speed, practicality, color matching of digital proofing, and even the technique of remote proofing are very mature. Whether it is today, tomorrow, or the day after tomorrow, your digital proof will also be a stable draft. As for the price, compared with the past, the price of digital proofing has been much lower than before.

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