Double color book printing, simply refers to the process of reproducing the
effect of a manuscript by using a combination of two different colors of ink.
Generally, in the C, M, Y, and K four color plates, the black (K) plate is
combined with any other three colors (C, M, Y) plates. The black book printing plate can enhance the
contrast of the image tone because of the stronger information distribution of
the image order in the dark tune.
main points of the design of double color printing
In the light, the tone of the Black Edition
is weakened, and the color levels of C, M and Y are stronger. This can make the
level of the image and the color change superimposed together. It is easier to
reproduce the original color level and order information of the image. While
the combination of C, M and Y Tri Color, although the color range of the bright
location is large, but there is no image level in the dark place, which leads
to the small color contrast of the image, and it is difficult to reproduce the
original effect of the image. Therefore, most of the two color booklet printing designs refer to the
combination of black and other spot colors.
The key to double color book printing is to
make double color processing to achieve the desired color effect by changing
the relationship of dual color combination on the basis of fully protecting the
original level and order information of the image. The best tool to achieve
this color effect is the double tone in the Photo - shop image processing
Dual tone is achieved by adjusting two
different color curves to achieve graphic designer's image effect. That is to
say, dual color printing is not a direct reduction of C, M, Y, and K four
colors (minus two channels, two channels), but based on the structure principle
of the gray pattern image itself. Adjust the two colors through the curve tool
and recombine the colors at different levels.