How to do a good job of packaging printing process proofing and color?
Time:2022-07-08
Views:3019
First, the importance of printing document proofing and color
With color proofing is the best way, if you don‘t pull, not with the basis of color, a single rely on design documents, is unreliable, because the color of the computer and the actual printing there are still a lot of difference, a lot of printing salesman will purchase and so on with the problem of color conflict, so as a qualified procurement staff, with color issues should know, The color can not rely on subjective consciousness, the printing process is cumbersome, each process has a different impact on the color difference, in addition, the process will also affect the color difference, for example, the overall color of the dumb glue will be dark, we can see the importance of the color.
Two, printing with color matters needing attention
1, The film, pay attention to the field part can not have holes (light leakage), CMYK each film corner line must be completely consistent, no flower, no scratches;
2. Proofread the sample carefully;
3, When signing, pay attention to the requirements of paper, printing quality, delivery time, after the process, shall not be careless!
4. Documentary.
We should pay attention to the color of printing (real or not real, enough, heavy or light, mainly against the sample);
On the version (is CMYK corner line is not aligned, it is best to use a magnifying glass, can see 1, 2 line error);
Note that there is no obvious dirty spot in the light color part of the printed matter, and point it out at any time to let the printer wipe the plate;
Pay attention to the dark part of the printed matter if there are redundant white spots or other color spots, erase at any time;
Each printing part, workers will take out a few out to see the sample, printing machine running for a period of time may appear a certain color running light or heavy phenomenon.
Three, digital proofing with color problems
1, A color with color problem
In printing production, primary color (CMYK) with color is more difficult, mainly because the ink hue and printer ink hue is different, digital primary color is synthesized by different proportions of CMYK ink. When printing CMYK monochrome, adding or subtracting ink will only change the depth of the color, not the hue of the color. Therefore, once the hue is wrong, it can not follow the digital sample.
2, Neutral gray with color problem
Neutral gray is also a color system that is difficult to follow. In the printing process, the dot of a certain color version changes slightly (even 1% of the dot change), and the human eye can feel it. For printing, it is difficult to control the dot changes in a small range.
3, The second color of the dark with color problems
Secondary color mainly refers to C+M, C+Y, Y+M, C+K, Y+K, M+K, the dark part of these colors in the printing and color is also difficult to match completely, especially C+M synthetic blue purple, Y+M synthetic red, its truth is the same as neutral gray with color, the human eye is very sensitive to these colors, printing ink slightly changed, It makes a big visual difference.
4. The combination of large area color blocks and images of the same color system
Large area of color block ink, but also easy to see the difference in color, when large area of color block and image row in the same ink path, printing ink control is difficult to take care of both at the same time.
5, The combination of the opposite tone
The same ink key position has the main tone of the opposite image, printing is not easy to follow the color. For example, a blue sky scenery is placed on the top and a portrait is placed on the bottom. In order to highlight the blue sky on the top, the amount of C ink needs to be increased, while the amount of C ink needs to be reduced to highlight the skin color of the figure. So once the digital proofing slight deviation, can not adjust the printing ink to follow the color.
6, Spot color proofing with color
From the current actual production situation, basically can not achieve spot color simulation proofing. Spot color hue is mainly standard chromatography, digital proofing only as a reference. In the proofing process, it is generally converted to spot color ink CMYK four colors, and then printed ink to simulate, in the spot color to CMYK set printing color process, easy to produce errors.
Four, film proofreading eleven matters to note
1. Check whether the required information is complete before proofreading: layout, text, color, size, (drawing) information, design, film inspection list, carton, trademark identification card
2, Each film is dirty.
3. There are no scratches on the film.
4, There is no lack of corner line.
5. Correct layout and text.
6, Angle line and color version of overprint accuracy.
7. Whether the pattern is complete.
8. Is there anything wrong with the size?
9. Is there any bleeding?
10, Each spot color version there is no color separation error.
11, Bite position and film around the following content: product name (and output batch), size, color code, output date, producer code, color bar.
12.Check the Angle of the network cable for heavy network.
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Anna Zhang