How to do the proofing and color of packaging material printing process?
Time:2022-11-11
Views:3111
1. The importance of proofing and color of printed documents
Proofing is the best way to follow the color difference, if not proofing, there is no basis to follow the color, relying on the design document alone, is not reliable, because the computer color difference and the actual printing is still a lot of difference, many printing salesmen are therefore in conflict with the color problem and procurement, so as a qualified procurement personnel, with the color problem should know, The printing process is complicated. Each process has a different impact on the color difference. In addition, the process will also affect the color difference.
2. Printing and color matters needing attention
Proofing is the best way to follow the color difference, if not proofing, there is no basis to follow the color, relying on the design document alone, is not reliable, because the computer color difference and the actual printing is still a lot of difference, many printing salesmen are therefore in conflict with the color problem and procurement, so as a qualified procurement personnel, with the color problem should know, The printing process is complicated. Each process has a different impact on the color difference. In addition, the process will also affect the color difference.
2. Printing and color matters needing attention
1) Proof must be carefully proofread;
2) Pay attention to the dark part of the printed matter there are no excess white spots or other color spots, at any time to erase;
3) For each part of the printing, the worker will take out a few to see the sample. Because the printing press run for a period of time may appear a certain color running light or heavy phenomenon.
3. Digital proofing with the color problem
3. Digital proofing with the color problem
1) a color and color problem
In printing production, it is difficult to match the color of primary color (CMYK), mainly because the ink hue is different from the printer ink hue. The primary color of digital samples is synthesized by different proportions of CMYK ink. When printing CMYK monochrome, add or subtract the amount of ink will only change the shade of the color, will not change the hue of the color. Therefore, once the color is wrong, it can not follow the digital sample.
2) Neutral gray and color problem
Neutral gray is also a difficult color system to follow. In the printing process, the dot of one color version changes slightly (even 1% dot change), the human eye can feel it. For printing, it is difficult to control the change of dot in a small range.
3) The darkening and color problem of the secondary color
The secondary color mainly refers to C+M, C+Y, Y+M, C+K, Y+K, M+K. The dark part of these colors is also difficult to fully match in printing and color, especially the blue purple synthesized by C+M and the big red synthesized by Y+M. The reason is the same as the neutral gray color. There‘s a big visual change.
4. Combination of large area color blocks and images with the same color system
Large area of color block ink, but also easy to see the color difference, when the large area of color block and image in the same ink path, printing ink volume control is difficult to take care of both.
5. The combination of opposite tones
When the same ink key position has the opposite main tone image, printing is not easy to follow the color. For example, a blue sky landscape is arranged on the top, and a portrait is arranged on the bottom. In order to highlight the blue sky on the top, the amount of C ink needs to be increased, while in order to highlight the skin color of the figure, the amount of C ink needs to be reduced. In this way, once the digital proofing is slightly wrong, it is impossible to adjust the printing ink to follow the color.
6. Spot color proofing and color
From the current production situation, basically can not realize spot color simulation proofing. Spot color hue mainly to standard chromatography, digital proofing only as a reference. In the proofing process, the spot color is generally converted to ink CMYK four colors, and then printed ink to simulate, in the spot color to CMYK set of printing process, easy to produce errors.
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Anna Zhang