When making large area of color printing,
color choice, try to avoid choosing the sensitive color of blue and purple and
its nearby, in the book printing process on the choice, try to avoid choosing large area of flat screen printing
process, the main reason is that in large area of flat screen printing, it is
easy to appear caused by machine and ink bar before or after the deep shallow
problem, based on this, had better choose the color of the field for large area
color printing. When faced with a section on both the color of image and the
large area of the base of color is black, suggested to use black field in the
black part to add 30% to 40% of the corresponding dieyin cyan, and such printed
black color quality of a material is uniformly thick, the main reason is that
in four-color book printing process,
the black field density should be less than 1.9, but under the density of color
printed on the visual effect will give people a feeling of thin, but by adding
green version can effectively make up for the deficiency of black printing
false. To that, of course, limited to the cyan color printing, combined with
the actual situation to adjust, if there is a warm color pattern on black, and
a feather edge vein, then the base and network requires flexible adjustment
according to warm color, such as magenta, black, yellow, 100% and 30% 20% can
be selected to superimpose, such effect is relative to add blue will be more
natural.
