1. One color and color problem
In printing production, the primary color (CMYK) is more difficult to follow, mainly because the hue of the ink is different from that of the printer. The primary colors of the digital samples are synthesized by different ratios of CMYK ink. When printing CMYK monochrome, the addition and subtraction of ink will only change the shade of the color, not the hue of the color. Therefore, once the hue is wrong, the digital pattern cannot be followed.
2. The problem of neutral gray color
Neutral gray is also a color system that is more difficult to follow. During the printing process, the dots of a certain color version change slightly (even 1% dot change), which can be felt by the human eye. For printing, the control dots are Changes in small areas are difficult.
3. The dark tone and color of the secondary color
The secondary colors mainly refer to C + M, C + Y, Y + M, C + K, Y + K, M + K. The dark parts of these colors are also difficult to completely match in the printing and color, especially the blue purple synthesized by C + M, the red synthesized by Y + M, the reason is the same Neutral gray is the same as colors. The human eye is very sensitive to these colors. A slight change in the amount of ink supplied during printing will produce a large visual change.
4. Combination of large-area color patches and images of the same color system
Large-area color patches use a lot of ink, and it is easy to see the difference in color. When large-area color patches and images are arranged in the same ink path, it is difficult to control the printing ink volume to take care of both at the same time.
5. Combination of opposite tones
When there are images with opposite main colors at the same ink key position, printing is not easy to follow the color. For example, there is a blue sky landscape in the upper row and a portrait of the person in the lower row. In order to highlight the blue sky above, the amount of C ink needs to be increased, and in order to highlight the skin color of the person, the C ink needs to be reduced. In this way, once there is a slight deviation, it is impossible to follow the color by adjusting the amount of printing ink.
6. Spot color proofing and color
Judging from the current actual production situation, it is basically impossible to realize the spot proof simulation. Spot colors are mostly based on standard chromatograms, and digital proofing is for reference only. During the proofing process, the spot colors are generally converted into four colors of ink CMYK, and then printed ink to simulate, in the process of spot color to CMYK overprint color process, it is easy to produce errors.
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