1. traditional color matching method for spot ink
In book
printing China, the traditional spot color ink color matching method is based on the
operator's skills and experience for many years, through observation, contrast
way to color matching, generally suitable for small printing enterprises with
low color requirements. However, in the process of use, many enterprises
reflect that even if the color matching method is reasonable, the color
difference between the printed product and the original manuscript is still
very large, and the defective rate is high, which seriously affects the normal
production.
It is
understood that in the use of traditional spot color ink color matching method
configuration of spot color and original spot color comparison, the general
practice is to first carry out manual ink, and then with the original spot
color comparison, in fact, this practice is unscientific. Because the
uniformity and thickness of the ink layer greatly affect the color effect of
the spot color ink, when the ink color after the ink is not different from the
original color, the operator will mistakenly think that the spot color ink has
been prepared and started printing. As a result, the color difference between
the print and the original is far away. In this process, the traditional spot
color matching method is combined with the mechanical ink leveling mechanism,
which can reduce the color difference of printing products caused by subjective
judgment errors.
In addition, the paper on the traditional spot-color
ink color effect can not be ignored in book printing. The paper of different materials has different color effect on the
printing product. In the process of making and comparing with the original, it
is necessary to use the same paper as the printing material.
Even so, it is possible to produce the same color spectrum phenomenon
because of the color error, which shows that the two color printed samples look
the same under one light source, but they show differences under the other
light source. Therefore, when conditions permit, try to use computer spot ink
color matching.
2. computer color matching method
Large printing enterprises
with high color requirements usually use computer spot ink color matching
method. The principle is to first use spectrophotometer to determine the target
color of book printing China. After processing by computer color matching
software, the color information of the target color is displayed in the form of
objective data, and then the basic color data stored in the database is used to
match the color. When the color difference between the copy color and the
target color is caused by the influence of raw material properties and process
parameters, the computer color matching system will automatically correct the
formula used and control the color difference within the allowable range.