Exhibition

Home > Exhibition > Content
How to distinguish the paper performance and definitely print the color separation parameters
Nov 22, 2018


How to distinguish the paper performance and definitely print the color separation parameters


How to distinguish the paper performance and definitely print the color separation parameters?


Firstly, the compensation sample of the dot increase is being set


When the ink is transferred to the appearance of the paper under pressure, the ink diffuses to the surroundings when it is saturated due to the absorption of the paper, resulting in an increase in dots and making the entire image darker. Obviously, different grades of paper will produce different dot gain effects. The stronger the paper absorbability, the larger the dot spread value. In detail, the newsprint is the largest and the coated paper is the smallest. The dot formed by the paper performance increases the expansion rule of the ordinary presentation index mode. In the pre-press disposal process, it is necessary to stop the compensation for the influence of the dot gain.


Regarding the dots of different sizes, the dot gain value is different. The ordinary high-key and dark-adjusted dot gain values are small, and the mid-tone dot gain value is large. The default setting for common initiatives is better. For example, the default value for coated paper is about 17%, for offset paper is about 22%, and for newsprint is about 30%.


Secondly, choose the color separation type GCR, UCR


With GCR, it is easy to adhere to the gray balance, reduce the total amount of ink overprint, make the ink boring faster, and improve the printing speed. The quality of the black version plays an insignificant role in the entire printing. For ordinary manuscripts, GCR is proposed. Special originals, such as high-grade color, dark and rich images, can also use UCR. In short, you must be sensitive.


Thirdly, the total ink setting


The printing characteristics of the paper, as well as the high speed of the rotary printing, have determined that the total ink volume cannot be too high. The data of foreign countries shows that the total black quantity of newsprint printing is generally controlled at 240%~260%; the total ink quantity of coated paper printing is generally controlled at 280%~320%; the total ink quantity of offset paper printing is generally controlled at 300%~340%. The setting of this value is determined by each process and is completely dependent on the dot spread rate at the time of printing. If the network expansion is serious, you need to reduce the value. Otherwise, the dark adjustment will be partially dead, and the mid-dark level loss will be serious. If the network expansion is normal, you can increase the value appropriately to ensure that the dark color is full and the performance is sufficient. Dark-tuning the regional level is conducive to the reproduction of the entire tone. In addition, you should choose the ink that matches your paper based on the paper.