Use DCS 2.0
It is best to use the DCS 2.0 file format for storing, placing, and outputting six-color channel color separations. This is a special version of the DCS format developed by Quark a few years ago. It uses a low-resolution placement icon and automatically replaces it with a high-resolution image on output.
DCS 2.0 is used in Photoshop. The separation file must be converted to multi-channel mode (Image>Mode). The Lc and Lm channels must be named and set as spot channels. The number of lines and net angles for each channel must be set as described earlier. If the output is through a company with screen printing image separation experience, the last step may not be performed. However, if you do not know how to output the file, you must complete the final step.
To save the file, select File>Save As Photoshop DCS 2.0, then select a single file and check the "Color Composite" option.
These options can be output directly from Photoshop to the imagesetter, or output to the imagesetter via layout software such as QuarkXPress, PageMaker, etc., or output to the imagesetter via drawing software such as Illustrator, Freehand, CorelDRAW, etc. In either of the above cases, when the image is placed in drawing software or layout software, all of the color separations are entered into the software as one piece of the image. You can now use Lc and Lm as types, boundaries, or backgrounds.
If you do not use the DCS 2.0 option, you can select the Split Channel command in the channel's floating panel. It is now possible to output or place each channel separately. This method takes a little time to understand, but it is a versatile method for handling multi-channel images.
Printing production
In general, six-color images can be printed from the darkest to the brightest colors. It has been said before that this method of black printing can reduce the negative effect of black. In fact, when black prints first, other overprint colors will also suppress black. This allows the darkest color to be revealed without being completely buried in black. My specific printing sequence is black, cyan, magenta, yellow, Lc, and Lm.
Color ordering is useful because it allows four colors to be printed first along the conventional process. The real difference is in the last two colors, and these are the brightest colors, so the main color is less likely to make mistakes. Key points can be placed in key areas to ensure that the last two printed colors are printed correctly.
If a densitometer is used to measure the color of a controlled print, the six-color process is consistent with the traditional four-color process. By measuring the solid color patches of light-colored overprint inks, the density of high-profile, mid-tone, and dark tone is displayed. When the job is completed, the color matching, gray balance, and overall visual effects are strictly evaluated. The initial experiment of six-color printing is the same as the traditional four-color overprinting, but it is not too strict.
Mesh count and tension
Since only lighter values ​​in existing overprinting inks are printed, mesh selection and tension remain consistent with conventional printing. According to the conventional production requirements, the difference in the tension of each color screen is kept within ±1 N/cm. High tension can be better controlled, so it is necessary to try to keep all the screen tension at a minimum of about 25 N/cm. If you have problems with the consistency of the screen tension or moiré due to tension changes, six-color printing will help you solve these problems.
Six-color printing success
Six-color printing is not the destruction of traditional printing, but the expansion and progress of traditional printing. The goal as a printer is to make profits greater than inputs. Two additional colors are added, but the profit from printing control, the enlargement of the tonal range, the reduction of moiré, and the enhancement of color expression capabilities are far greater than the cost.
This special color model is one of many different color separation technologies and it is classified as a field in which digital color science continues to develop. The 150-year-old traditional CMYK model is giving way to multi-spectral multi-channel color separation technology, and will see and hear more about it in the future.
When yellow and black are printed, dark cyan and dark magenta are printed again, then light cyan and light magenta are printed, the hue range is obviously greatly enlarged, it has good high tone and dark tone details and the pure ash of the entire hue area .
Article origin: Disc Manufacturing Expert
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