Book printing matter embellishes people's life and adds gorgeous color to
people's life. What are the characteristics of qualified printed matter? What
should we pay attention to in the printing process? Here are some of the more
difficult colors to print and some design experience before printing. Let's
have a look.
Gray balance, according to the experience
of theory and production practice, the most difficult color to control is gray
balance. Gray balance is that in a certain printability, yellow, magenta and
cyan primary color plates are combined and overprinted from light to deep
according to a certain dot ratio to obtain different brightness achromatic
(white, light gray, gray, dark gray and black), that is, to get the color of
neutral gray in vision. There are many factors that affect it, such as the
amount of ink used by the printing brush, paper, full plate concentration, dot
area, overprint and the number of screen lines This is the most testing machine
overprint accuracy and operator skills.
2,4-color and 3-color screen, do not print full color (spot color
printing is recommended).
3. Things designed by people who don't know
how to print are the most difficult to print. Color is on the one hand, too
many multi-color, extremely thin lines, very small words transparent white,
etc.
4, C = 50m = 50y = 50K = 50 of the large flat net, a little bit
wrong on the color deviation serious.
5. The characters are of four colors, that is, there are characters
in the four colors of CMYK, especially the very small characters, which are
difficult to cover, and the requirements for the paper teeth of the machine are
very high. This is also a common problem, so the prepress designer must check
whether the black text, especially small words, is only on the black version,
and should not appear on other three color versions. If it appears, the quality
of the finished product will be greatly reduced. In Book printing process,
when RGB graphics are converted to CMYK graphics, the black text will
definitely turn into four-color black. Unless otherwise specified, it must be
dealt with.
6. It's also hard to handle the black background in Book printing process. Black background in order to achieve the effect, you can use extra
black ink or print twice, it is not very difficult to print, more
labor-consuming.
7, the superposition of several color dot, especially more than 70%
dot. To be specific, dark brown, coffee, dark green (flat screen, containing
blue 70), dark blue, purple blue, etc. are difficult to print due to the color
difference, which is difficult to find a balance on the printing machine.
8. In printing, it is generally difficult to follow the color of
the full plate things with spot color full plate or large area, reverse white
characters, the same logo and the same color block. It is easy to produce color
difference, ghost shadow, rubbing dirt and scratch.
In a word, a qualified print must meet the
following requirements: first, accurate overprint; second, uniform ink color;
third, full dot; fourth, ink balance; fifth, no printing fault, such as
rubbing, scratch, pattern, paste, etc.; sixth, strict adherence to the
original. Printing enterprises must pursue high-quality Book printing matter to adapt to people's increasing aesthetic concept.
