In the traditional printing process, proofing is the first and very important part. Traditional proofing is undoubtedly the closest to the final print, but none of the techniques is perfect. With the application of inkjet technology in the printing industry, digital proofing is gradually emerging, and with its short process and variable data advantages, it has quickly become a powerful complement to traditional proofing.
Here, we will discuss the application and development prospects of digital proofing in the printing industry.
First, the use of proofing
First of all, let's clarify the purpose of proofing, whether it is traditional proofing or digital proofing, there are three points:
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 after the customer signs the sample can be printed on the machine†is the printing industry to ensure the accuracy of the printed content and quality, the principle of distinguishing the responsibilities of both parties, but also the needs of the printing workers according to the sample The basis for adjusting the printing environment.
3. Wrong inspection: Through the proofs, the quality of each process link in the prepress can be thoroughly checked, and errors that have occurred or may appear in the printing are found, so as to correct them and reduce the risk of production. Therefore, the proofing has the functions of finding errors in the prepress operation for the user and the printing unit, providing various types of proofs for printing, and as a basis for reaching a contract with the customer 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 inadequacies of traditional proofing
Traditional printing proofing, because the consumables used are basically the same as the final printed matter, is undoubtedly the closest to the printed products, but the traditional proofing has its fatal shortcomings:
1. It takes a long time to proof. Because the traditional proofing process is the same as printing, the only difference is the amount of printing. There are many processes in the pre-press RIP plate making, loading, and ink changing, which leads to long time-consuming proofing.
2, not economic. On the one hand, there is no reduction in the number of processes, resulting in more materials. On the other hand, when proofing, the yield is low, and it usually takes half a day or even revision to make a sample.
3. Occupy more human resources. Generally, traditional proofing requires at least two full-time staff members. One must also be a master level. Generally, a master who has had many years of experience in captains 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 theoretically possible.
What are the advantages of digital proofing compared to traditional proofing:
1. The proofing is simple and the time is short. With the inkjet printer and color management software, it can restore more than 90% of the printing color, easy to operate, just need to do a characteristic curve, output a pair of open proofs usually more than ten minutes to get.
2, color repeatability. Because the inkjet printer itself is relatively stable, the entire proofing process is computer controlled, which greatly improves the stability and repeatability of digital proofing, which is unmatched by traditional proofing.
3. Cost savings. Because the digital proofing process is simple, the resource consumption is very small, and the waste is very small, basically zero. The digital operation process, so there is no need for special personnel to operate, usually after a week of training can be qualified for the job.
Fourth, the principle of digital proofing
Because of the obvious advantages, in the field of commercial printing, digital proofing quickly replaced traditional proofing. So what is the principle of digital proofing? How is it achieved?
Color management for digital proofing can be easily summarized into three steps:
1. Printer basic linearization;
The basic linearization determines the physical properties of the paper and ink, optimizes the total inkjet volume of the printer and the amount of single-channel ink, and finds the maximum ink capacity of the proofing paper, which provides the basis and optimization characteristics for the creation of the printer paper profile. , thus establishing the foundation of color management.
In fact, most inkjet printers are not linear output states. In addition to the advantages and disadvantages of proofing media, the maximum color density value is generally obtained when the total ink volume does not reach 100%. Thereafter, even if the ink volume increases, the color Density will not change significantly or even decrease.
This results in a hierarchical union of profiles, so basic linearization determines the maximum total ink volume and single-channel ink volume.
After the base linearization of the printer, the portion exceeding the tolerance of the amount of paper ink will be ignored, and the chromaticity values ​​expressed by the remaining ink-jet range will be evenly distributed, that is, the range of 0%-100% of the printed color block will be printed. The average is distributed to 0%-X% of the ink amount, which is expressed as a linear change in density. A linearized printer will get a much better profile than a linearized version.
2. Make a digital proofing paper profile;
Based on the linearized file produced and the measured amount of ink, the printout is used to create a color signature for the paper profile, such as IT8.7/3, ECI2002, etc., and the profile is measured and produced in the ICC software.
3. Match printer profile and print profile.
After the above steps, only the best match between the specific printer and the medium is obtained, that is, the maximum color gamut of the specific printer and the medium is known. To complete the 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 it can be an international standard, such as ISO12647-2 standard, or FOGRA standard. The color difference between the two color gamuts determines the proximity of digital proofing to printing. .
Fifth, the development direction of digital proofing
Previously, due to the reason of ink, the limitations of consumables used in inkjet were more prominent. Digital proofing can only be done with specific digital proofing paper, but not on the most commonly used coated paper. The gap between the media led to digital proofing and print. There are still some distances, so digital proofing is only used in commercial lithography, but less in the packaging and printing industry.
Nowadays, universal printing inks have appeared on the market. For example, the water-based universal ink developed by Hongsheng can be directly printed on the copper paper with the heating device, and the vividness and firmness of the color are ideal, which can fully meet the requirements of digital proofing. In addition, printer manufacturers are accelerating the development of machines suitable for packaging proofing, such as epson, mimaki respectively introduced machines that can print white ink, and some manufacturers use UV drying technology to meet the market demand.
In short, whether it is Hongsheng's "copper paper printing solution" using water-based universal ink or digital proofing by other inkjet methods, it will inevitably greatly promote the use of digital proofing in the printing industry, and it is a long-established traditional printing. The industry injects new vitality.
In the traditional printing process, proofing is the first and very important part. Traditional proofing is undoubtedly the closest to the final print, but none of the techniques is perfect. With the application of inkjet technology in the printing industry, digital proofing is gradually emerging, and with its short process and variable data advantages, it has quickly become a powerful complement to traditional proofing.
Here, we will discuss the application and development prospects of digital proofing in the printing industry.
First, the use of proofing
First of all, let's clarify the purpose of proofing, whether it is traditional proofing or digital proofing, there are three points:
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 after the customer signs the sample can be printed on the machine†is the printing industry to ensure the accuracy of the printed content and quality, the principle of distinguishing the responsibilities of both parties, but also the needs of the printing workers according to the sample The basis for adjusting the printing environment.
3. Wrong inspection: Through the proofs, the quality of each process link in the prepress can be thoroughly checked, and errors that have occurred or may appear in the printing are found, so as to correct them and reduce the risk of production. Therefore, the proofing has the functions of finding errors in the prepress operation for the user and the printing unit, providing various types of proofs for printing, and as a basis for reaching a contract with the customer 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 inadequacies of traditional proofing
Traditional printing proofing, because the consumables used are basically the same as the final printed matter, is undoubtedly the closest to the printed products, but the traditional proofing has its fatal shortcomings:
1. It takes a long time to proof. Because the traditional proofing process is the same as printing, the only difference is the amount of printing. There are many processes in the pre-press RIP plate making, loading, and ink changing, which leads to long time-consuming proofing.
2, not economic. On the one hand, there is no reduction in the number of processes, resulting in more materials. On the other hand, when proofing, the yield is low, and it usually takes half a day or even revision to make a sample.
3. Occupy more human resources. Generally, traditional proofing requires at least two full-time staff members. One must also be a master level. Generally, a master who has had many years of experience in captains 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 theoretically possible.
What are the advantages of digital proofing compared to traditional proofing:
1. The proofing is simple and the time is short. With the inkjet printer and color management software, it can restore more than 90% of the printing color, easy to operate, just need to do a characteristic curve, output a pair of open proofs usually more than ten minutes to get.
2, color repeatability. Because the inkjet printer itself is relatively stable, the entire proofing process is computer controlled, which greatly improves the stability and repeatability of digital proofing, which is unmatched by traditional proofing.
3. Cost savings. Because the digital proofing process is simple, the resource consumption is very small, and the waste is very small, basically zero. The digital operation process, so there is no need for special personnel to operate, usually after a week of training can be qualified for the job.
Fourth, the principle of digital proofing
Because of the obvious advantages, in the field of commercial printing, digital proofing quickly replaced traditional proofing. So what is the principle of digital proofing? How is it achieved?
Color management for digital proofing can be easily summarized into three steps:
1. Printer basic linearization;
The basic linearization determines the physical properties of the paper and ink, optimizes the total inkjet volume of the printer and the amount of single-channel ink, and finds the maximum ink capacity of the proofing paper, which provides the basis and optimization characteristics for the creation of the printer paper profile. , thus establishing the foundation of color management.
In fact, most inkjet printers are not linear output states. In addition to the advantages and disadvantages of proofing media, the maximum color density value is generally obtained when the total ink volume does not reach 100%. Thereafter, even if the ink volume increases, the color Density will not change significantly or even decrease.
This results in a hierarchical union of profiles, so basic linearization determines the maximum total ink volume and single-channel ink volume.
After the base linearization of the printer, the portion exceeding the tolerance of the amount of paper ink will be ignored, and the chromaticity values ​​expressed by the remaining ink-jet range will be evenly distributed, that is, the range of 0%-100% of the printed color block will be printed. The average is distributed to 0%-X% of the ink amount, which is expressed as a linear change in density. A linearized printer will get a much better profile than a linearized version.
2. Make a digital proofing paper profile;
Based on the linearized file produced and the measured amount of ink, the printout is used to create a color signature for the paper profile, such as IT8.7/3, ECI2002, etc., and the profile is measured and produced in the ICC software.
3. Match printer profile and print profile.
After the above steps, only the best match between the specific printer and the medium is obtained, that is, the maximum color gamut of the specific printer and the medium is known. To complete the 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 it can be an international standard, such as ISO12647-2 standard, or FOGRA standard. The color difference between the two color gamuts determines the proximity of digital proofing to printing. .
Fifth, the development direction of digital proofing
Previously, due to the reason of ink, the limitations of consumables used in inkjet were more prominent. Digital proofing can only be done with specific digital proofing paper, but not on the most commonly used coated paper. The gap between the media led to digital proofing and print. There are still some distances, so digital proofing is only used in commercial lithography, but less in the packaging and printing industry.
Nowadays, universal printing inks have appeared on the market. For example, the water-based universal ink developed by Hongsheng can be directly printed on the copper paper with the heating device, and the vividness and firmness of the color are ideal, which can fully meet the requirements of digital proofing. In addition, printer manufacturers are accelerating the development of machines suitable for packaging proofing, such as epson, mimaki respectively introduced machines that can print white ink, and some manufacturers use UV drying technology to meet the market demand.
In short, whether it is Hongsheng's "copper paper printing solution" using water-based universal ink or digital proofing by other inkjet methods, it will inevitably greatly promote the use of digital proofing in the printing industry, and it is a long-established traditional printing. The industry injects new vitality.
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