1. The color with color problem at a time
Printing production, a color (CMYK) color with difficult, mainly due to the different ink and printer ink color hue, a color digital sample by different proportion of CMYK ink synthetic technological equipment. And when printing CMYK monochrome, add and subtract the ink quantity will only change the color depth, will not change the color hue central printing. Therefore, once the color is wrong, cannot follow to the digital sample.
2. The problem of neutral grey with color
Neutral gray is also difficult to with a color, in the printing process, some color version of the site a little change (or even 1% of the network changes), the human eye can feel that for printing, it is difficult to control network in the small scope changes.
3. The secondary color dark color and color problem
Secondary color refers to the C + M Y and Y + M, C, C + + K + K, M, Y + K, the color of the dark color part is difficult to exactly match in printing with color, especially the violet C + M synthesis, synthesis of bright red Y + M, with neutral grey with the same color as the truth, the human eye is sensitive to the color, printing ink quantity in the slight change, can produce a lot of visual changes.
4. The combination of the shades of the same color of large area and image
A large area of color piece in ink capacity is much, but also easy to see the difference of color, when large areas of color piece and image in the same ink road, printing ink quantity control is very difficult to take care of both at the same time.
5. In contrast color combination
The same ink key positions have main colors instead of the image, it is not easy to printing with color printing in the middle. Top row of a blue sky the scenery, for example, the following row a portrait, in order to highlight the blue sky above, need to increase the amount of C ink, and in order to highlight the character color need to reduce C ink supplies. Once the digital proofing a slight deviation, so can't by adjusting the quantity of printing ink and color.
6. The color proofing and color
From the current actual production conditions, basically can not achieve the color simulation proofing central printing. Hue of the color is given priority to with standard chromatography, digital proofing printing market only as a reference. In the process of proofing, are generally converts the color ink CMYK four-color, again with printing ink to simulate, around the color CMYK overprint color process, prone to error.
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