Relationship between CIP3 and digital color quality control system
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Since many factories currently have their own forms for prepress, printing, and postpress processing, it is often caused by human error or poor connection. CIP3-PPF came into being to solve this problem completely.
Currently commonly used color quality control methods are:
1. Color correction of the scanner - pay attention to the accuracy of the scanner, the color difference of the scanning range and the color difference of the scanning in different time periods, and the calibration is usually based on the manufacturer's profile or our own. Create a profile and further explore the profile that best fits this machine.
2. Color Correction of the Computer Screen - The color correction of the screen is also corrected for the Profile, which is corrected for about two weeks on the screen.
3. Color correction of the proofing equipment - the sample equipment also needs its own profile, which should be corrected once in about one month, especially when replacing the ink brand.
4. Directly calculate the printing ink data from the large version of the electronic draft - output the test sample provided by the manufacturer, and then measure the color difference value for the output sample, and then make the profile according to this, and then further correct device.
5. Computer with ink - mainly for the special color, manufacturers must first establish a complete database of their own ink, when the special color of the ink is used up, the computer can calculate the ink in the current inventory, Formulate a number of formulas that are closest to this particular color, and display the color difference between each formula and the special color, and the manufacturer can select the matching use from it.
6. The color correction of the printed sheets - that is, the colors of the first and the Nth sheets are the same, that is, the color stability is maintained.
7. Calculate the ink discharge data from the scanning plate.
The above-mentioned color quality control method is a work that should be done without CIP3, and CIP3 itself is under the control of good color quality, and it is possible to have the best effect.
Due to the inherent limitations, not all color control methods can be integrated into the CIP3 file format. If possible, all color corrections can be automated; unfortunately, it can't be entered like screen proofing. .
In order to comply with the CIP3 environment, the current equipment and practices in the industry are:
1. Directly calculate the ink discharge data from the large version of the electronic draft - in the operation process of CIP3, it is not necessary to calculate the ink discharge data by means of plate scanning, and the automatic homing can also be built into CIP3. In the file format, the data is directly sent to the printing machine by computer connection, which saves time for setting up and operating the printing press.
2. Transfer the color reference data to the printing machine - on the color control of the printing sheet, CIP3 can be adjusted and corrected according to the profiles of various printing machines, so that different printers can print the same color and effect; The reference data is the device profile of the printer.
When the color control work is done, we can find that the set time and production process will be shortened, and the probability of production errors will decrease, so we can further approach the One-Button ideal; One-Button ideal That is, the printing staff does not need to control the ink, nor does it need to be adjusted. It only needs to press the button to run the printer. The colors are correct and no adjustment is needed. Heidelberg's exhibition venue two months ago. This ideal has been realized: from the imposition of the plate directly through the RIP CTP way to print the plate, the machine printing is randomly selected by the site a guest button, in order to prove that no adjustment, the printed product can be proofed Quite close.
Provide industry practices (recommended products)
CIP3-PPF is famous for pre-press products such as CreoScitex's Ink
PRO, PrintLink, Heidelberger's Delta Technology, Prepress Interface With CP2000 Center and Image Control. Heidelberg products are also recommended for the printing process.
Since Heidelberg's research on CIP3 is very complete, the following is a description of the application of CIP3 in color control management with its print production process.
1. The layout is the beginning of digital production, integrated in the file format of CIP3-PPF
(1) Set the range of color and ink color and auto-regulation control.
(2) Geometric definition of cutting and origami.
2. Enter DELTA, CIP3-PPF is integrated
(1) RIP
(2) Data that produces the amount of ink discharged.
In this way, a lower-order file that can calculate the ink discharge speed is sent to the CPC-32, and the RIP data can be sent to the output or output plate.
3. CPC-32 is a Prepress Interface
Heidelberg's approach to color quality control between prepress and printing is:
Through the RIP through the CPC-32 to directly transfer the ink data to the CTP output plate, direct printing, the printer does not need to set the ink discharge data on the ink line, the computer operation value is corrected, basically will be more than manual adjustment To be precise, CIP3-PPF is integrated in CPC-32:
(1) Depending on the printer, there are different characteristic curves for setting.
(2) Transfer the ink discharge data to the press.
(3) The printer automatically sets the amount of ink discharged by the received ink.
4. CPC-24 stabilizes the printing quality through the printing of the full-page sheet. After the sheet and the sample are compared to the gamut of the sample, the gamut compression is adjusted, and then directly sent back to the printer for correction, and CIP3-PPF Integrated here.
(1) Measure the color and ink gamut of the print.
(2) Printed color gamut reference value.
(3) CPC-24 compares reference values with printed products.
(4) Automatically set the printer to match the proof color.
Future direction
The direction of color quality control on CIP3 is to achieve complete automatic adjustment and automatic setting, completely eliminating the influence of human error. In addition, through a cross-platform file format such as CIP3, we can directly print on the Internet. Because CIP3 integrates the profiles of various printers, it is possible to improve customer satisfaction regardless of the type of machine that achieves similar results and performance.