How to ensure accurate conversion of color gamut

For example, using ISO, the ISO standard is converted into the color gamut of printing presses so that the printing press can print ISO standards. In the implementation of standardization, the problem is not in the printing factory. The printing factory focuses only on the stability of the manuscript, but if it is said that the standard color will be used, the key point will be before printing. If there are four plates, give the same data today. Different printing factories will print different colors. If you want different printing companies to print the same color, you need to give different data, so after such a conversion, the two printing houses can print the same. s color.

The printers may be different presses such as Misubishi, Komori, and Heidelberg. As long as this mechanism is used, there is no difference between different printing presses. It is only necessary to know that the printing press prints color guides and knows the color space of the machine. When pre-pressing and de-meshing, before converting the color gamut to the desired color, the three printers can print the same color. This is the use on the printing press.

In terms of file format, the gamut conversion is almost all converted in Photoshop, so you can only change the pattern. Is there a mechanism to transfer PDF and Postscript, because the last large version is a PDF or Postscript file, so you should find one Can do gamut conversion, but the gamut conversion to be accurate to do well, ICC just can not do, because ICC gamut compression problem, the only way is to do a color correspondence table, color mapping table it to each Each color block is accurate, and any two printing houses can print the same results as long as they are stable enough.

If the digital sample is to be proofread with the printed matter, that is to say, after finishing the digitally printed paper and ICC, it will be done a second time. One ICC is to convert the ISO to the second ICC calibrated in the second color, and then take this ICC image file to digital proofing, and it will be accurate to play it out; in fact, it is not necessary to tune the RIP curve, just put the If the ICC is allowed to make another sample and the second ICC is done, it will be correct and you may not need to adjust the curve.

Because different advertising companies may adopt different standards in color gamut conversion, such as Japanese manuscripts, Japanese gamut standards are used, but printers often receive manuscripts from several advertising companies, but each advertising company The standards adopted are different. At this time, it is necessary to change the color gamut; from the color gamut of different advertising companies directly to the color gamut of a printing factory, the printer can print the colors that customers want. As long as the pre-gamut conversion is converted into the color that the customer wants, it will be converted into the standard in the printing factory; so it is very simple. If the customer adopts the ISO standard, he will turn the ISO into the standard of the printing press in the factory. The color of the ISO standard is printed, so when the designer receives the manuscript, he can do the conversion of the color gamut in advance.

Then there is the lithographic, gravure, and flexo. How to convert Flexo's colors to lithographic printing is the same as doing color gamut conversion. First measure the color gamut printed by Flexo and turn it into a lithographic printing machine. The domain, as long as the color gamut is converted, the printed color will be the same as the Flexo India color. If it is gravure, it can also use such color gamut conversion, so that customers can get the desired color.

Finally, for the printing industry, if we give an RGB electronic guide to a print shop, we will come out and put the RBG's color gamut into it. We will create an ICC Profile, and then we will use Photoshop's gamut conversion. After the conversion, it will become A picture file is flushed to the photo shop, and the RGB color guide on the photo will become very good. The color will also be very accurate, and it will be the same as the color that was originally seen on the screen. When the color is not controlled, it needs to be converted in advance. If the color can be controlled, it will be converted when printing, so there are two ways to do the conversion of the color gamut. The gamut conversion has two key points. It specifies the description file and color space conversion. The designation is an ICC Profile. The color gamut conversion is two ICC Profiles. Therefore, what color is given to a printing shop is specified first. Adobe specifies the color profile. Or RGB, the color seen on the screen is the standard of sRGB, and the colors printed on the printing machine of the printing shop will have an ICC profile, so you can convert it in advance and change from sRGB to Kodak, The color that the Agfa or Konica's printing machine rushes out of, as long as doing the gamut conversion, the color that the printing produces actually will be consistent with the color that sees on the screen, this kind is the advance transformation. Usually when the printer wants to print, it decides the printed color gamut. For example, if the CMYK print goes to an RGB ordinary printer, then the two color gamuts do the conversion. If the computer is not directly connected to the punching machine, Then convert the file in advance and then rinse it to get the color you want.