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The necessity and feasibility of color
necessity
Pre-press proofing is an indispensable part of the printing process. The timeliness and stability of traditional proofing are flawed. The appearance of digital proofing properly solves this problem.
What are the difficulties in digital proofing?
The imaging principle and printing equipment of inkjet printers used in digital proofing are quite different, resulting in poor color consistency between printed samples and printed products. Therefore, the color control of digital proofing (color-matching) is particularly important in the entire proofing process, and the implementation process is also more complicated.
feasibility
The color proofing of digital proofing is a must, and the implementation process is more complicated. Is it possible to simulate the color of the printing press by adjusting the output color of the printer?
The answer is yes, of course, if you want to achieve a better color, the prerequisites are essential.
Prerequisites:
Inkjet printer supporting the use of Hongsheng water-based universal ink
1, the inkjet printer output color stability
2, can instantly output the required proofs
3, according to the output of proofs in the computer software, the printer's ink jet manually or automatically, so as to hit the color with the purpose.
4. The JETALL water-based universal ink provided by Hongsheng has strong media adaptability and a wide color gamut, and can meet more color needs.
Use the spectrophotometer to read the printed color blocks into the software. Some RIP software will automatically select the maximum value of the single color ink. However, in order to achieve the purpose of simulating the color of the printing press, we must manually select the color close to the printing. Print monochrome ink values.
The RIP software that controls the printer provides a control bar for monochrome ink control, corresponding to a variety of single colors. Comparing the monochrome in the printed product and the print patch, select the corresponding value in proportion.
Stacked total ink control
The total amount of ink is printed to control the color block. The upper half of the color block is used to measure the value of the automatically generated total ink. The following is used to visually select and select the corresponding value.
Follow color approach
The premise of color
Printing equipment is relatively stable. If we keep changing with the color of the object, then this color is worthless. In the actual application process, the stability of the printing press is affected by many factors, and some adjustments are more difficult. Therefore, the stability of the printing press is only relative, as long as the difference between each printing is not enough.
We can only use the ink jet printer with good stability and easy adjustment to simulate the color of the printing machine so as to achieve the purpose of following color.
Method one: Print color adjustment according to printing proofs
If the printing factory only provided us with printed standard proofs, how can we keep up with the colors?
In the RIP software of the control printer, the purpose of following color is achieved by adjusting the ink ejection amount of the printer, multi-color linearization data printing, and proofs printed close to the finished product.
1, ink control
In general RIP software, the ink volume control is divided into two parts: single-channel ink volume control and superimposed total ink volume control. The following describes the two ink volume control methods respectively.
Single channel ink control
Use the spectrophotometer to read the printed color blocks into the software. Some RIP software will automatically select the maximum value of the single color ink. However, in order to achieve the purpose of simulating the color of the printing press, we must manually select the color close to the printing. Print monochrome ink values.
The RIP software that controls the printer provides a control bar for monochrome ink control, corresponding to a variety of single colors. Comparing the monochrome in the printed product and the print patch, select the corresponding value in proportion.
Stacked total ink control
The total amount of ink is printed to control the color block. The upper half of the color block is used to measure the value of the automatically generated total ink. The following is used to visually select and select the corresponding value.
In order to better simulate the color of printed products, here we also need to manually select the total amount of ink, select a set of superimposed colors close to the overprinted color on the printed proofs as the limit of the total amount of ink.
2, multi-color linear control
The linearization work of RIP software is done by software automatically, but here we need to follow the color, so when you complete the automatic linearization there is still a phenomenon of poor color consistency, we can use manually modify the linear parameter pair The printer output color is further adjusted.
If you need to modify the linearity to achieve the purpose of color, it means that we have a certain degree of color cast proofs, the printer will also appear after the adjustment of similar color cast, these color cast will be clearly reflected in the neutral gray and other superimposed colors on.
The RIP software's linearization adjustment interface is similar. Compare the printed and printed proofs and select the color to be adjusted and fill in the corresponding “input and output†values ​​to adjust. You can also click on a point on the curve to move up or down to modify.
What is the device profile?
"International Color Consortium" is a data set file describing the color characteristics of devices for solving the problem of color consistency among different devices. At present, a variety of RIP software for controlling the printer support the call of the ICC file. The following describes the calling method of the printer ICC file.
1. Correctly generate the printer ICC file
The printing press ICC file is the focus of this set of proofing and coloring process and is the standard we refer to. The color target file must be printed after the printer is stabilized and scanned using a spectrometer.
2, the call of the device characteristics description file
The printer ICC file records the color characteristics of the printer and can be used to control the printer's single-channel ink, effectively simulating the printer's color gamut; it can also be loaded into the print workflow as a basis for color space conversion.
Three: The implementation of spot color simulation on the printer
Spot color refers to the color printed with a special four-color (CMYK) special ink (produced by four colors in proportion).
Most printers also use the regular four-color output, but the use of supplies with a wider color gamut can simulate a part of the print spot color.
1, choose a larger color space target space
Most of the spot colors are the colors that the printer can't display using the regular four colors, which means that the spot color is the color outside the printer's color gamut. Therefore, in order to achieve the aim of simulating a spot color, the original printer ICC file cannot be used, and the ICC file that generates the maximum color gamut of the printer can be used as a target space.
2, the acquisition of the color value of the spot color
Under realistic conditions, spot color prints tend to be printed only, and there is no corresponding data file in the computer. Therefore, to simulate a spot color, the color value of the spot color must be obtained first.
In the color picker software, a spectrometer can be connected to read the Lab color of the spot color in the print, and the color value of the corresponding color space can be obtained by transferring the corresponding target ICC to the CMYK space (or other color space).
Select a spot color in the standard color card to directly convert to other color space.
3, the use of spot color data
In the image editing software (Photoshop, Illustrator, Coreldraw), the pattern is modified and edited according to the obtained color value so that the spot color part in the pattern prints a color that is consistent with the printed spot color.
JETALL Waterborne Universal Ink Advantages
First, the medium adaptability
Can print all the paper used for printing, especially coated paper, gold and silver cardboard, and even including PVC film, PE film and other media. The effect of proofing using printing paper is closer to that of the printed product, and the effect of exactly matching the printing can be achieved in the color and texture of the paper base.
Second, the perfect combination of quick-drying and fluidity
The quick drying of ink is an indispensable requirement in digital proofing applications. The quick drying of ink when printing uncoated media at a lower heating temperature is necessary, and at the same time, the waiting for ink drying is greatly shortened during the color correction process. Time, because there are chromatic aberrations when printing blocks before and after the ink has dried. In addition, the drying speed of the ink on the media also affects the value selected when the maximum ink amount is controlled.
Although JETALL's water-based omnipotent technology has fast drying ability on media, it also has good nozzle moisturizing function, which ensures the long-term print fluency of the printer.
Third, wide color gamut, high color saturation
The color gamut of the printer is mainly determined by the ink. The color of Hongsheng JETALL water-based universal ink is specially developed for printing paper. From the ICC document color gamut viewer, it can be clearly seen that the printing gamut is larger than the printing gamut, and the ink The color saturation is high. These determine the ability to simulate more spot colors when printing spot colors and take advantage of digital proofing.
necessity
Pre-press proofing is an indispensable part of the printing process. The timeliness and stability of traditional proofing are flawed. The appearance of digital proofing properly solves this problem.
What are the difficulties in digital proofing?
The imaging principle and printing equipment of inkjet printers used in digital proofing are quite different, resulting in poor color consistency between printed samples and printed products. Therefore, the color control of digital proofing (color-matching) is particularly important in the entire proofing process, and the implementation process is also more complicated.
feasibility
The color proofing of digital proofing is a must, and the implementation process is more complicated. Is it possible to simulate the color of the printing press by adjusting the output color of the printer?
The answer is yes, of course, if you want to achieve a better color, the prerequisites are essential.
Prerequisites:
Inkjet printer supporting the use of Hongsheng water-based universal ink
1, the inkjet printer output color stability
2, can instantly output the required proofs
3, according to the output of proofs in the computer software, the printer's ink jet manually or automatically, so as to hit the color with the purpose.
4. The JETALL water-based universal ink provided by Hongsheng has strong media adaptability and a wide color gamut, and can meet more color needs.
Use the spectrophotometer to read the printed color blocks into the software. Some RIP software will automatically select the maximum value of the single color ink. However, in order to achieve the purpose of simulating the color of the printing press, we must manually select the color close to the printing. Print monochrome ink values.
The RIP software that controls the printer provides a control bar for monochrome ink control, corresponding to a variety of single colors. Comparing the monochrome in the printed product and the print patch, select the corresponding value in proportion.
Stacked total ink control
The total amount of ink is printed to control the color block. The upper half of the color block is used to measure the value of the automatically generated total ink. The following is used to visually select and select the corresponding value.
Follow color approach
The premise of color
Printing equipment is relatively stable. If we keep changing with the color of the object, then this color is worthless. In the actual application process, the stability of the printing press is affected by many factors, and some adjustments are more difficult. Therefore, the stability of the printing press is only relative, as long as the difference between each printing is not enough.
We can only use the ink jet printer with good stability and easy adjustment to simulate the color of the printing machine so as to achieve the purpose of following color.
Method one: Print color adjustment according to printing proofs
If the printing factory only provided us with printed standard proofs, how can we keep up with the colors?
In the RIP software of the control printer, the purpose of following color is achieved by adjusting the ink ejection amount of the printer, multi-color linearization data printing, and proofs printed close to the finished product.
1, ink control
In general RIP software, the ink volume control is divided into two parts: single-channel ink volume control and superimposed total ink volume control. The following describes the two ink volume control methods respectively.
Single channel ink control
Use the spectrophotometer to read the printed color blocks into the software. Some RIP software will automatically select the maximum value of the single color ink. However, in order to achieve the purpose of simulating the color of the printing press, we must manually select the color close to the printing. Print monochrome ink values.
The RIP software that controls the printer provides a control bar for monochrome ink control, corresponding to a variety of single colors. Comparing the monochrome in the printed product and the print patch, select the corresponding value in proportion.
Stacked total ink control
The total amount of ink is printed to control the color block. The upper half of the color block is used to measure the value of the automatically generated total ink. The following is used to visually select and select the corresponding value.
In order to better simulate the color of printed products, here we also need to manually select the total amount of ink, select a set of superimposed colors close to the overprinted color on the printed proofs as the limit of the total amount of ink.
2, multi-color linear control
The linearization work of RIP software is done by software automatically, but here we need to follow the color, so when you complete the automatic linearization there is still a phenomenon of poor color consistency, we can use manually modify the linear parameter pair The printer output color is further adjusted.
If you need to modify the linearity to achieve the purpose of color, it means that we have a certain degree of color cast proofs, the printer will also appear after the adjustment of similar color cast, these color cast will be clearly reflected in the neutral gray and other superimposed colors on.
The RIP software's linearization adjustment interface is similar. Compare the printed and printed proofs and select the color to be adjusted and fill in the corresponding “input and output†values ​​to adjust. You can also click on a point on the curve to move up or down to modify.
What is the device profile?
"International Color Consortium" is a data set file describing the color characteristics of devices for solving the problem of color consistency among different devices. At present, a variety of RIP software for controlling the printer support the call of the ICC file. The following describes the calling method of the printer ICC file.
1. Correctly generate the printer ICC file
The printing press ICC file is the focus of this set of proofing and coloring process and is the standard we refer to. The color target file must be printed after the printer is stabilized and scanned using a spectrometer.
2, the call of the device characteristics description file
The printer ICC file records the color characteristics of the printer and can be used to control the printer's single-channel ink, effectively simulating the printer's color gamut; it can also be loaded into the print workflow as a basis for color space conversion.
Three: The implementation of spot color simulation on the printer
Spot color refers to the color printed with a special four-color (CMYK) special ink (produced by four colors in proportion).
Most printers also use the regular four-color output, but the use of supplies with a wider color gamut can simulate a part of the print spot color.
1, choose a larger color space target space
Most of the spot colors are the colors that the printer can't display using the regular four colors, which means that the spot color is the color outside the printer's color gamut. Therefore, in order to achieve the aim of simulating a spot color, the original printer ICC file cannot be used, and the ICC file that generates the maximum color gamut of the printer can be used as a target space.
2, the acquisition of the color value of the spot color
Under realistic conditions, spot color prints tend to be printed only, and there is no corresponding data file in the computer. Therefore, to simulate a spot color, the color value of the spot color must be obtained first.
In the color picker software, a spectrometer can be connected to read the Lab color of the spot color in the print, and the color value of the corresponding color space can be obtained by transferring the corresponding target ICC to the CMYK space (or other color space).
Select a spot color in the standard color card to directly convert to other color space.
3, the use of spot color data
In the image editing software (Photoshop, Illustrator, Coreldraw), the pattern is modified and edited according to the obtained color value so that the spot color part in the pattern prints a color that is consistent with the printed spot color.
JETALL Waterborne Universal Ink Advantages
First, the medium adaptability
Can print all the paper used for printing, especially coated paper, gold and silver cardboard, and even including PVC film, PE film and other media. The effect of proofing using printing paper is closer to that of the printed product, and the effect of exactly matching the printing can be achieved in the color and texture of the paper base.
Second, the perfect combination of quick-drying and fluidity
The quick drying of ink is an indispensable requirement in digital proofing applications. The quick drying of ink when printing uncoated media at a lower heating temperature is necessary, and at the same time, the waiting for ink drying is greatly shortened during the color correction process. Time, because there are chromatic aberrations when printing blocks before and after the ink has dried. In addition, the drying speed of the ink on the media also affects the value selected when the maximum ink amount is controlled.
Although JETALL's water-based omnipotent technology has fast drying ability on media, it also has good nozzle moisturizing function, which ensures the long-term print fluency of the printer.
Third, wide color gamut, high color saturation
The color gamut of the printer is mainly determined by the ink. The color of Hongsheng JETALL water-based universal ink is specially developed for printing paper. From the ICC document color gamut viewer, it can be clearly seen that the printing gamut is larger than the printing gamut, and the ink The color saturation is high. These determine the ability to simulate more spot colors when printing spot colors and take advantage of digital proofing.
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