The proofing personnel should control the ink density so that the dried density on the proof sheet is between the highest and lowest reference density. If you use the SWOP single-level color reference manual, the density of the T-state measurement should be within the range of the reference density + -0.07.
The SWOP Color Reference Manual is the effect of printing on specified SWOP paper using SWOP proofing inks. These inks have been certified by the SWOP specification of the SWOP/NAPIM proofing ink certification program in terms of color accuracy. These two color reference manuals are approved by IPA and can be used.
Dot gain value/tone increase value* To ensure correct and balanced tone reproduction, it is recommended to print the dot enlargement amount of 50% tone from the file or film as follows:
Target Value Tolerance Blue 20 17 -23
20 17-23
Black 22 19 -25
Yellow 18 15 -21
* In the proofing process, the dot gain value in the tolerance range tends to be closer to the high value end than the bias effect to the low value end is closer to the printing effect on the printing press.
* In order to obtain the correct gray balance value, the total amount of difference between the dot enlargement value of each color of YMC three colors and their target value must not exceed 4%. In other words, if the halftone value of the color of the green or the product is increased by 2% (22%), the change in yellow should not be greater than -2% (16%).
The difference between the actual value and the target value of the target value is 20% black 22% +2%
Product 20% 20% 0
Yellow 18 16 -2%
Another explanation for this specification is that when the yellow dot gain test value increases by 2%, the difference in primary colors (C, M, Y) should not be more than 4%.
Print Contrast* Print contrast is an important feature of the printing process and should be controlled during proofing. According to the data collected by the SWOP calibration tool printing press during 1993-1995, the recommended values ​​are:
Green 30-40%
30-40%
Black 35-45%
Yellow 25-35%
Separation proofs and job information sheets* Separation proofs are no longer needed in most publishing processes. In many cases, a SWOP press proof and an off-line proof are sufficient.
* When performing color separation and proofing for the publishing process, it should include four monochromatic samples, one tricolor sample and one four color sample.
* Ensure consistency between all proofs and separation proofs (if used) and the amount of ink remains stable.
* Printers or off-line proofs, or color separation proofs, should include the name, address, and telephone number of the prepress service center. If possible, indicate the name of the contact who has the problem. Job information sheets can be used to illustrate these situations.
* The number of proofs and the need for color separations are generally specified by the publisher.
* Samples and separation proofs should not be booked in case they may damage some areas and affect the reading of the color control strip by the densitometer.
Two-color and black-and-white proofing * Printer proofs or off-line proofs should be sent to the customer with each set of black and white or bi-color film. The copying effect obtained by color overprinting of black and white photographs may be required for specific publishing requirements. Therefore, it is necessary to check with the publishers about the acceptance of the proofs, the number of screens and the number of proofs required.
For off-line proofing, as long as the requirements of the manufacturer's SWOP Application Data Sheet are met, SWOP recognizes such analog proofs and digital offline proofs (halftone or non-halftone). SWOP does not certify the accuracy of the offline proofing system. Ultimately, whether any proofing system can be accepted by the user's workflow is entirely up to the user.
Producers of an off-line proofing system must have a SWOP application data specification sheet so that the user's proofs are as close as possible to the apparent effect of the SWOP printed proofs. According to SWOP's experience, the application of data specification sheets is equally effective for both conventional proofing and digital proofing systems.
SWOP Application Data Specification One-way production personnel recommend data for density, dot gain, color sequence, colorants, and substrates for the most matching SWOP printed proofs.
The SWOP also established a method for demonstrating the consistency of proofs and producers' application data sheets. Users can contact GATF to obtain the necessary process for the certification process.
* In the application, the appearance of off-line proofs must simulate the effects of the proofing process on the SWOP press as much as possible. It is the responsibility of the proofing staff to ensure consistency with the SWOP application data specification sheet.
Note that when the off-line proofs are in accordance with the specification of the producer's SWOP application data specification sheet, it does not mean that the proofs obtained have been completely matched with the SWOP print proofs. In addition, it should be recognized that different offline proofing systems may not exactly match with other systems.
SWOP Calibration Kits including certified proofs are available from GATF. In addition, the pictures and test target electronic files used in the SWOP calibration tool can be obtained from the ISO 12640 standard CD provided by NPES. These tools can be used to determine the relationship (subjective and objective relationships) between an approved printed proof and the proofing system being used. (To be continued)
The SWOP Color Reference Manual is the effect of printing on specified SWOP paper using SWOP proofing inks. These inks have been certified by the SWOP specification of the SWOP/NAPIM proofing ink certification program in terms of color accuracy. These two color reference manuals are approved by IPA and can be used.
Dot gain value/tone increase value* To ensure correct and balanced tone reproduction, it is recommended to print the dot enlargement amount of 50% tone from the file or film as follows:
Target Value Tolerance Blue 20 17 -23
20 17-23
Black 22 19 -25
Yellow 18 15 -21
* In the proofing process, the dot gain value in the tolerance range tends to be closer to the high value end than the bias effect to the low value end is closer to the printing effect on the printing press.
* In order to obtain the correct gray balance value, the total amount of difference between the dot enlargement value of each color of YMC three colors and their target value must not exceed 4%. In other words, if the halftone value of the color of the green or the product is increased by 2% (22%), the change in yellow should not be greater than -2% (16%).
The difference between the actual value and the target value of the target value is 20% black 22% +2%
Product 20% 20% 0
Yellow 18 16 -2%
Another explanation for this specification is that when the yellow dot gain test value increases by 2%, the difference in primary colors (C, M, Y) should not be more than 4%.
Print Contrast* Print contrast is an important feature of the printing process and should be controlled during proofing. According to the data collected by the SWOP calibration tool printing press during 1993-1995, the recommended values ​​are:
Green 30-40%
30-40%
Black 35-45%
Yellow 25-35%
Separation proofs and job information sheets* Separation proofs are no longer needed in most publishing processes. In many cases, a SWOP press proof and an off-line proof are sufficient.
* When performing color separation and proofing for the publishing process, it should include four monochromatic samples, one tricolor sample and one four color sample.
* Ensure consistency between all proofs and separation proofs (if used) and the amount of ink remains stable.
* Printers or off-line proofs, or color separation proofs, should include the name, address, and telephone number of the prepress service center. If possible, indicate the name of the contact who has the problem. Job information sheets can be used to illustrate these situations.
* The number of proofs and the need for color separations are generally specified by the publisher.
* Samples and separation proofs should not be booked in case they may damage some areas and affect the reading of the color control strip by the densitometer.
Two-color and black-and-white proofing * Printer proofs or off-line proofs should be sent to the customer with each set of black and white or bi-color film. The copying effect obtained by color overprinting of black and white photographs may be required for specific publishing requirements. Therefore, it is necessary to check with the publishers about the acceptance of the proofs, the number of screens and the number of proofs required.
For off-line proofing, as long as the requirements of the manufacturer's SWOP Application Data Sheet are met, SWOP recognizes such analog proofs and digital offline proofs (halftone or non-halftone). SWOP does not certify the accuracy of the offline proofing system. Ultimately, whether any proofing system can be accepted by the user's workflow is entirely up to the user.
Producers of an off-line proofing system must have a SWOP application data specification sheet so that the user's proofs are as close as possible to the apparent effect of the SWOP printed proofs. According to SWOP's experience, the application of data specification sheets is equally effective for both conventional proofing and digital proofing systems.
SWOP Application Data Specification One-way production personnel recommend data for density, dot gain, color sequence, colorants, and substrates for the most matching SWOP printed proofs.
The SWOP also established a method for demonstrating the consistency of proofs and producers' application data sheets. Users can contact GATF to obtain the necessary process for the certification process.
* In the application, the appearance of off-line proofs must simulate the effects of the proofing process on the SWOP press as much as possible. It is the responsibility of the proofing staff to ensure consistency with the SWOP application data specification sheet.
Note that when the off-line proofs are in accordance with the specification of the producer's SWOP application data specification sheet, it does not mean that the proofs obtained have been completely matched with the SWOP print proofs. In addition, it should be recognized that different offline proofing systems may not exactly match with other systems.
SWOP Calibration Kits including certified proofs are available from GATF. In addition, the pictures and test target electronic files used in the SWOP calibration tool can be obtained from the ISO 12640 standard CD provided by NPES. These tools can be used to determine the relationship (subjective and objective relationships) between an approved printed proof and the proofing system being used. (To be continued)
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