Create printability profile
The printability profile of the entire production line is like the object that the screen soft proofing needs to simulate. Creating a profile is a basic job. Since there are many changes in the entire production line, the dataization of the main control parameters of the production process and the stability control based on accurate detection become the necessary conditions for the generation and use of the entire process profile. The key to accurate data control is to add test strips (such as Ugra's print control strip, Bruner's print control strip, and various self-designed simple test strips) to the newspaper's hanging position or trailer. And use visual and densitometer tests. For the color newspaper of general newsprint grades, the main control parameters include the following.
1. Outlet and print version quality parameters
If the linearity error of the film is less than 2%, 3% to 5% of the dots must be aligned, and 98% of the dots must not be padded.
2. The main quality monitoring parameters of the printing process
(1) Density range: according to industry standards, the general color newspaper four-color ink density control range: yellow 0.60 ~ 0.80, magenta 0.80 ~ 1.00, blue 0.90 ~ 1.10, black 1.00 ~ 1.15, many high-level printing factory default scope Both are much smaller than the standard; the best on-site density: yellow 0.75, magenta 0.95, cyan 1.00, black 1.10; common color newspaper printing contrast K: yellow 0.22, magenta 0.22, blue 0.22, black 0.27.
(2) Ink and ink balance: 3% to 5% of the outlets should be aligned, and 98% of the outlets should not be stuck.
(3) Other parameters: such as network distortion, gray balance and so on.
After the plate making and printing process is controlled, based on the paper parameters (such as paper whiteness, ink overprinting rate and ink color parameters, etc.), the commonly used paper and ink combinations are established separately within the control range of the above plate printing parameters. Different profiles, and in the color management process, different suitability profiles are selected according to the paper and ink combination of the day and the time.
If you want to obtain a more accurate, relatively fine state of the classification of the color newspaper print Profile, the best way is to use a professional color management system to produce. Such as professional color management software ProfileMaker profile generated control interface, you can see that the establishment of the characteristics of the file has two parameters need to be determined: one is based on the color standard of IT8.7/3 color conversion parameters, it is the generation characteristics The basic parameters of the document are generated by classifying and printing the digital color scale according to various conditions, and using an on-line colorimeter to perform color patch testing under the control of software such as ProfileMaker and MeasureTool; the other is for color separation and The process parameters of the printing conditions are selected to include such parameters as separation parameters, black point gray balance, ink volume control, etc. These parameters determine different ink ratios to achieve the same color effect, and the optimum range requires experience and experimentation. Finally use ProfileMaker to complete the generation of the profile.
Create screen corrections
The corrected screen and its corresponding profile are the basis of the screen-based simulation color management application program discussed in this article. The screen correction refers to the process of establishing the characteristic file through the hardware and software system of the screen profile generation system based on the optimization and adjustment of the screen display state. In addition, it also refers to the regression adjustment of the existing parameter-type screen profile and the current profile setting status. The calibration of the screen and the generation of the characteristic file can adopt the following two methods.
1. Screen correction using a screen colorimeter
Using the screen colorimeter and its accompanying screen correction software, the screen can be adjusted to the ideal state and establish the corresponding state profile, such as X-Rite's MonacoOPTIX screen correction instrument. First, the brightness and contrast of the display are precisely set under the feedback of the screen colorimeter to ensure that the display has the largest tonal range and color gamut. Then the user can set the white point and Gamma value and use this as a basis to form a corrected screen profile by automatically performing a screen test on a group of color Blocks.
2. Adobe Gamma software screen correction
This is a method that everyone is familiar with. It is also to set the optimal brightness and contrast of the screen with the help of the software visual bar, and then set the color temperature (ie, the white point, the requirement and the display's hardware set the same color temperature, generally 5000K or 6500K) and Gamma (Window system Generally 2.2), and then through the corresponding visual bar and adjustment function for optimal adjustment of Gamma and color temperature in order to achieve the best, after the formation of a screen profile can be used by the color management process. This parameter-type profile is less effective than a hardware system because of its limited accuracy and direct visual adjustment.
(to be continued)
The printability profile of the entire production line is like the object that the screen soft proofing needs to simulate. Creating a profile is a basic job. Since there are many changes in the entire production line, the dataization of the main control parameters of the production process and the stability control based on accurate detection become the necessary conditions for the generation and use of the entire process profile. The key to accurate data control is to add test strips (such as Ugra's print control strip, Bruner's print control strip, and various self-designed simple test strips) to the newspaper's hanging position or trailer. And use visual and densitometer tests. For the color newspaper of general newsprint grades, the main control parameters include the following.
1. Outlet and print version quality parameters
If the linearity error of the film is less than 2%, 3% to 5% of the dots must be aligned, and 98% of the dots must not be padded.
2. The main quality monitoring parameters of the printing process
(1) Density range: according to industry standards, the general color newspaper four-color ink density control range: yellow 0.60 ~ 0.80, magenta 0.80 ~ 1.00, blue 0.90 ~ 1.10, black 1.00 ~ 1.15, many high-level printing factory default scope Both are much smaller than the standard; the best on-site density: yellow 0.75, magenta 0.95, cyan 1.00, black 1.10; common color newspaper printing contrast K: yellow 0.22, magenta 0.22, blue 0.22, black 0.27.
(2) Ink and ink balance: 3% to 5% of the outlets should be aligned, and 98% of the outlets should not be stuck.
(3) Other parameters: such as network distortion, gray balance and so on.
After the plate making and printing process is controlled, based on the paper parameters (such as paper whiteness, ink overprinting rate and ink color parameters, etc.), the commonly used paper and ink combinations are established separately within the control range of the above plate printing parameters. Different profiles, and in the color management process, different suitability profiles are selected according to the paper and ink combination of the day and the time.
If you want to obtain a more accurate, relatively fine state of the classification of the color newspaper print Profile, the best way is to use a professional color management system to produce. Such as professional color management software ProfileMaker profile generated control interface, you can see that the establishment of the characteristics of the file has two parameters need to be determined: one is based on the color standard of IT8.7/3 color conversion parameters, it is the generation characteristics The basic parameters of the document are generated by classifying and printing the digital color scale according to various conditions, and using an on-line colorimeter to perform color patch testing under the control of software such as ProfileMaker and MeasureTool; the other is for color separation and The process parameters of the printing conditions are selected to include such parameters as separation parameters, black point gray balance, ink volume control, etc. These parameters determine different ink ratios to achieve the same color effect, and the optimum range requires experience and experimentation. Finally use ProfileMaker to complete the generation of the profile.
Create screen corrections
The corrected screen and its corresponding profile are the basis of the screen-based simulation color management application program discussed in this article. The screen correction refers to the process of establishing the characteristic file through the hardware and software system of the screen profile generation system based on the optimization and adjustment of the screen display state. In addition, it also refers to the regression adjustment of the existing parameter-type screen profile and the current profile setting status. The calibration of the screen and the generation of the characteristic file can adopt the following two methods.
1. Screen correction using a screen colorimeter
Using the screen colorimeter and its accompanying screen correction software, the screen can be adjusted to the ideal state and establish the corresponding state profile, such as X-Rite's MonacoOPTIX screen correction instrument. First, the brightness and contrast of the display are precisely set under the feedback of the screen colorimeter to ensure that the display has the largest tonal range and color gamut. Then the user can set the white point and Gamma value and use this as a basis to form a corrected screen profile by automatically performing a screen test on a group of color Blocks.
2. Adobe Gamma software screen correction
This is a method that everyone is familiar with. It is also to set the optimal brightness and contrast of the screen with the help of the software visual bar, and then set the color temperature (ie, the white point, the requirement and the display's hardware set the same color temperature, generally 5000K or 6500K) and Gamma (Window system Generally 2.2), and then through the corresponding visual bar and adjustment function for optimal adjustment of Gamma and color temperature in order to achieve the best, after the formation of a screen profile can be used by the color management process. This parameter-type profile is less effective than a hardware system because of its limited accuracy and direct visual adjustment.
(to be continued)
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