According
to the printing color number, the following can be distinguished:
(1)
Monochrome printing in book
printing: it is not limited to black. It is applicable
to all printing documents displayed in one color. Poly color printing is
divided into three types: casing method, register method and multi color
method.
For
the color enhancement method, add another color within the double line range in
the monochrome image to make it clear and bright for reading. The brush of
general children's books is mostly used; In the chromatic method, the colors
are independent, do not overlap each other, and there is no other color as the
edge line of the range, which is successively overprinted on the printed
material. Generally, the printing of line table, commodity packaging paper and
terrain are mostly used.
(2)
Color printing in book
printing: that is, multi-color printing. According to
the additive color mixing process, the natural color original is decomposed
into the primary color separation plate, and then the primary color plate is
reprinted on the same printed material by the pigment subtractive color mixing
process. The natural color printing of the original is also obtained due to the
different overlapping area of the primary colors. All color prints, except for
a small number of additive and chromatic methods, are printed by multicolor
method.
Four
color printing mainly adopts the printing method. CMYK four-color (i.e. cyan,
magenta, yellow and black) inks are transferred to the printing materials for
color formation, which can reproduce various colors of the original through
different proportions of these four colors. In order to expand the color space,
more than four colors (such as six color printing) are also used. The packaging
industry often adopts the method of four colors plus one or more spot colors to
ensure that users' needs for color are met and enhance the anti-counterfeiting,
special and personalized characteristics of printed materials.