1) As far as the traditional analog proofing is concerned, there are three indicators that must be controlled and standardized in order to achieve the accuracy and stability of the output four-color ink proofs.
A. Equipment standards: Through equipment calibration, ensure that the proofing machine is in the best working condition, including proper pressure, standard platen temperature and air cushion blanket with best performance.
B. Material Standards: First, regulate the same brand, the same ink, do not use and use each other. Many four-color inks used by many organizations are miscellaneous, causing different profiles from those in the scanner and directly affecting the accuracy of color correction. Scanning cannot obtain correct image files. The second is to standardize paper. In principle, the same type of paper used for proofing and printing should be regulated. If proofing and printing use only one type of ink and use three types of paper, ie coated paper, matt powdered paper, and book type paper, three types of paper must be established. Property document to the printer.
C. Quality Standards: First, the specification of four-color ink field density values ​​is the core of the proofing and color management of the entire prepress operation, because the change of the field density value has a great influence on the color tone of the entire proofs. The second is to regulate the relative contrast value (K value), which is an important indicator to measure whether the density of the proofing (printing) is sufficient or not, and whether the dot gain is in line with the standard range. Generally, the quality is suitable for proofing, and the K value is above 0.40. Excellent.
At present, some proofing companies generally have two problems. First, the practice of pursuing the slightest increase in the number of outlets is the best practice, and it has caused small white holes at the center of outlets, which has caused printing to fail to catch up. This is a misunderstanding. There should be a standard range for proofing dot gains, and one can't care less about printing and one-sided pursuit of smaller dot gains. Practice has proved that 50% of the network at the increase of C, M ink is 8% -10%, Y, K 12% -13% is appropriate. Second, the use of DIC Japan's soft special ink for proofing has a wide gap with the ink used for printing, which often results in a large gap between the printed matter and the like, resulting in the customer being dissatisfied with the printed product. Therefore, it is important to standardize proofing and printing to use the same version of ink, and it is important to establish a Profile file of this ink. Prepress operations must create conditions for the final printing of good products.
2) As far as digital proofing is concerned, the first thing to do is to simulate the proofs of the traditional proofers (printing the color effects, and then creating the printer's characteristics file. The method is:
A. Correct the printer to ensure that the printer is in the best working condition, including determining the type of paper used.
B. First, a standard proof of ISO/IT 8.7.3 color standard is made by using traditional analog proofing, and the color proofing machine can automatically calibrate the color. ... uses the kmart color code, which contains 450 color patches. The color code file is generally a TIFF or PSE file.
C. Use a colorimeter or spectrophotometer to measure the colorimetric values ​​of the 928 color patches on the IT8.7.3 color scale.
D. The measured data is input into the printer characteristic software, and the characteristic file generation software compares and analyzes the chromaticity data of the original color patch and the output patch to generate a new printer characteristic file.
The author uses Wirt Image Technology (Shanghai) Co., Ltd.'s ORIS Color Tuner version 3.1 color management and digital proofing system. The proof color output directly on the Epson 5000 printer is basically the same as the color of traditional simulation proofing. By automatically correcting offset proofs up to 95%, gravure proofs can reach 90% accuracy. The system also provides users with a fine-tuned color tuning tool Fine Tuning with a user-friendly interface. It can handle both spot colors and background colors, as well as flexible level adjustment and sample selection tools, which can be used for different tone levels and The color is accurately processed to simulate the color of the proofing (printing) ink. Practice has proved that the development of digital proofing technology should be said to be mature. This is the best choice for color.
To sum up, only the output proofing standardization, the establishment of multiple ICC Profile Proofing environment, to ensure the accuracy of the output color, on the one hand provided to the input scanner to apply this Profile file to complete the scan separation; the other hand provides To print standard proofs, so that the input scan and output proofing, printing can get close to the color effect.
2. Standardization of the printing plate makes the quality of the printing plate stable, and ensures the correct transfer of the gradation outlets of the original image. There are three indicators that must be controlled and standardized.
1) The equipment standard guarantees that the plate-making machine and the PS plate-developing machine are in the best working condition, including the light source of the plate-making machine, and the automatic refilling device of the developing machine is sensitive.
2) Material Standards A. The specifications of the PS version of the brand, do not need to use several brands and recycled versions.
B. Specification and supporting the developer on the PS, to strictly control the developer concentration, the ratio is accurate, and can regularly replace the dose of new liquid supplement.
3) Quality Standard A. Determine the best exposure time, use the printing plate UGRA control bar to control the exposure, reach the step 4 ladder (0.6D) drying out, discern the resolution of the upper reaches, 8 Yin-Yang line integrity, tone control section 2% lighter than the sun.
B. Determine the optimal developer speed. The correct exposure should have the correct development to match. Apply the UGRA control strip to the development speed. The developed hollow point is relatively clear, and the corresponding small dot is suitable for the shadow liquid concentration.
C. To replace the PS version of a brand, to do a standardized test to ensure that the print part of the drying out of the oil and water repellent is good, the blank part of the hydrophilic and oil-repellent.
3. Imagesetter Standardizes the laser image-setter to a computer-supplied image file and outputs a CMYK four-color color separation sheet after RIP. This ensures that the dot size value of the scanning color separation setting can be accurately transferred to the color separation sheet. It has 3 The indicators must be controlled and standardized.
1) The equipment standard guarantees that the image-setter and the developing machine are in the best working condition, including the stability of the laser light source, the dot shape, the mesh angle, and the mesh line number that meet the printability, and the version replenishment device of the developing machine is sensitive.
2) Material Standards A. Standard film brands, according to the characteristics of the imager laser light source matching film, such as Agfa Phototypesetter is best to use Agfa film, Dolev800 Phototypesetter uses Ko to 2000, its dot reproducibility is good.
B. To achieve stable development conditions, use the syrup matching with the film brand, most of the current use of Aibisi 1000 sets of drugs, network quality is good, not crystallized.
3) Quality standards to achieve linear accuracy, the first is to control the correct exposure, so that the density of the color separation film on the ground to reach 3.8-4.5, the best for the 4.0-4.2, and accurate network transmission, For example, if the film is 2%, 50%, or 98%, the network will be restored, and the 50% network will be +-1%. If it does not meet the standard, adjust the amount of laser light. The second is to stabilize the development conditions, strictly control the developer concentration, temperature and make-up, to ensure that the bottom ash density is controlled here. Below 05, the more transparent the white film base, the better.
In summary, the stability of the post-process and the regulated quality standards are the basis for the stability and improvement of the entire system. It will give the scanner a correct feedback and enable the set of outlets to be within a reasonable range. Transferred between devices to ensure that the image color after scanning separation can get the effect of preview and output proofing colors.
Fifth, to ensure the accuracy of display, input color The current focus of color management is: First, to make various types of production software on the monitor display image color and digital proofer output proofs close to the color, and further close to the print color . The second is the characteristic management of the scanner, which makes the scanning technology more standardized and the color reproduction more accurate. Therefore, the correction and description of the display and the scanner are the most important things. (To be continued)
A. Equipment standards: Through equipment calibration, ensure that the proofing machine is in the best working condition, including proper pressure, standard platen temperature and air cushion blanket with best performance.
B. Material Standards: First, regulate the same brand, the same ink, do not use and use each other. Many four-color inks used by many organizations are miscellaneous, causing different profiles from those in the scanner and directly affecting the accuracy of color correction. Scanning cannot obtain correct image files. The second is to standardize paper. In principle, the same type of paper used for proofing and printing should be regulated. If proofing and printing use only one type of ink and use three types of paper, ie coated paper, matt powdered paper, and book type paper, three types of paper must be established. Property document to the printer.
C. Quality Standards: First, the specification of four-color ink field density values ​​is the core of the proofing and color management of the entire prepress operation, because the change of the field density value has a great influence on the color tone of the entire proofs. The second is to regulate the relative contrast value (K value), which is an important indicator to measure whether the density of the proofing (printing) is sufficient or not, and whether the dot gain is in line with the standard range. Generally, the quality is suitable for proofing, and the K value is above 0.40. Excellent.
At present, some proofing companies generally have two problems. First, the practice of pursuing the slightest increase in the number of outlets is the best practice, and it has caused small white holes at the center of outlets, which has caused printing to fail to catch up. This is a misunderstanding. There should be a standard range for proofing dot gains, and one can't care less about printing and one-sided pursuit of smaller dot gains. Practice has proved that 50% of the network at the increase of C, M ink is 8% -10%, Y, K 12% -13% is appropriate. Second, the use of DIC Japan's soft special ink for proofing has a wide gap with the ink used for printing, which often results in a large gap between the printed matter and the like, resulting in the customer being dissatisfied with the printed product. Therefore, it is important to standardize proofing and printing to use the same version of ink, and it is important to establish a Profile file of this ink. Prepress operations must create conditions for the final printing of good products.
2) As far as digital proofing is concerned, the first thing to do is to simulate the proofs of the traditional proofers (printing the color effects, and then creating the printer's characteristics file. The method is:
A. Correct the printer to ensure that the printer is in the best working condition, including determining the type of paper used.
B. First, a standard proof of ISO/IT 8.7.3 color standard is made by using traditional analog proofing, and the color proofing machine can automatically calibrate the color. ... uses the kmart color code, which contains 450 color patches. The color code file is generally a TIFF or PSE file.
C. Use a colorimeter or spectrophotometer to measure the colorimetric values ​​of the 928 color patches on the IT8.7.3 color scale.
D. The measured data is input into the printer characteristic software, and the characteristic file generation software compares and analyzes the chromaticity data of the original color patch and the output patch to generate a new printer characteristic file.
The author uses Wirt Image Technology (Shanghai) Co., Ltd.'s ORIS Color Tuner version 3.1 color management and digital proofing system. The proof color output directly on the Epson 5000 printer is basically the same as the color of traditional simulation proofing. By automatically correcting offset proofs up to 95%, gravure proofs can reach 90% accuracy. The system also provides users with a fine-tuned color tuning tool Fine Tuning with a user-friendly interface. It can handle both spot colors and background colors, as well as flexible level adjustment and sample selection tools, which can be used for different tone levels and The color is accurately processed to simulate the color of the proofing (printing) ink. Practice has proved that the development of digital proofing technology should be said to be mature. This is the best choice for color.
To sum up, only the output proofing standardization, the establishment of multiple ICC Profile Proofing environment, to ensure the accuracy of the output color, on the one hand provided to the input scanner to apply this Profile file to complete the scan separation; the other hand provides To print standard proofs, so that the input scan and output proofing, printing can get close to the color effect.
2. Standardization of the printing plate makes the quality of the printing plate stable, and ensures the correct transfer of the gradation outlets of the original image. There are three indicators that must be controlled and standardized.
1) The equipment standard guarantees that the plate-making machine and the PS plate-developing machine are in the best working condition, including the light source of the plate-making machine, and the automatic refilling device of the developing machine is sensitive.
2) Material Standards A. The specifications of the PS version of the brand, do not need to use several brands and recycled versions.
B. Specification and supporting the developer on the PS, to strictly control the developer concentration, the ratio is accurate, and can regularly replace the dose of new liquid supplement.
3) Quality Standard A. Determine the best exposure time, use the printing plate UGRA control bar to control the exposure, reach the step 4 ladder (0.6D) drying out, discern the resolution of the upper reaches, 8 Yin-Yang line integrity, tone control section 2% lighter than the sun.
B. Determine the optimal developer speed. The correct exposure should have the correct development to match. Apply the UGRA control strip to the development speed. The developed hollow point is relatively clear, and the corresponding small dot is suitable for the shadow liquid concentration.
C. To replace the PS version of a brand, to do a standardized test to ensure that the print part of the drying out of the oil and water repellent is good, the blank part of the hydrophilic and oil-repellent.
3. Imagesetter Standardizes the laser image-setter to a computer-supplied image file and outputs a CMYK four-color color separation sheet after RIP. This ensures that the dot size value of the scanning color separation setting can be accurately transferred to the color separation sheet. It has 3 The indicators must be controlled and standardized.
1) The equipment standard guarantees that the image-setter and the developing machine are in the best working condition, including the stability of the laser light source, the dot shape, the mesh angle, and the mesh line number that meet the printability, and the version replenishment device of the developing machine is sensitive.
2) Material Standards A. Standard film brands, according to the characteristics of the imager laser light source matching film, such as Agfa Phototypesetter is best to use Agfa film, Dolev800 Phototypesetter uses Ko to 2000, its dot reproducibility is good.
B. To achieve stable development conditions, use the syrup matching with the film brand, most of the current use of Aibisi 1000 sets of drugs, network quality is good, not crystallized.
3) Quality standards to achieve linear accuracy, the first is to control the correct exposure, so that the density of the color separation film on the ground to reach 3.8-4.5, the best for the 4.0-4.2, and accurate network transmission, For example, if the film is 2%, 50%, or 98%, the network will be restored, and the 50% network will be +-1%. If it does not meet the standard, adjust the amount of laser light. The second is to stabilize the development conditions, strictly control the developer concentration, temperature and make-up, to ensure that the bottom ash density is controlled here. Below 05, the more transparent the white film base, the better.
In summary, the stability of the post-process and the regulated quality standards are the basis for the stability and improvement of the entire system. It will give the scanner a correct feedback and enable the set of outlets to be within a reasonable range. Transferred between devices to ensure that the image color after scanning separation can get the effect of preview and output proofing colors.
Fifth, to ensure the accuracy of display, input color The current focus of color management is: First, to make various types of production software on the monitor display image color and digital proofer output proofs close to the color, and further close to the print color . The second is the characteristic management of the scanner, which makes the scanning technology more standardized and the color reproduction more accurate. Therefore, the correction and description of the display and the scanner are the most important things. (To be continued)
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