Many
sets of color management systems have appeared in the printing industry, which
provide book printing companies with great convenience in printing color control. However, the phenomenon of
color distortion cannot be avoided during the color printing process. Then in
the color printing, if the Chinese
printers are able to master the main factors of distortion, then the
color of book printing can be well grasped, and the complete effect in the mind of the customer can be
achieved smoothly.
1.
Scanning processing causes color distortion
The
image density of the photo manuscript is continuous, and the image information
needs to be collected into the computer. When scanning an image with a scanning
device, it is necessary to divide the image into discrete pixels, and collect
the R, G, and B information of each pixel on the original document line by
point. In the scanning process, the color information of the pixels will be
lost, and the image processing is based on the collected image information, and
all the operations on the color are also performed on this basis, and the color
information of the image cannot be increased. Therefore, for photo manuscripts,
scanning is a very critical link in image processing, and improper operation
will cause image color distortion.
2.
Color restoration processing causes color distortion
Modern
printing usually uses C, M, Y, and K four-color inks to reproduce colors. Due
to the purity of the ink itself, color distortion will also occur during color
box printing.
3.
Color distortion caused by color separation
Printing
usually uses C, M, Y, and K four-color inks to reproduce colors, and the image
information collected by digital acquisition equipment to the computer is
usually R, G, and B information. Therefore, the image information needs to be
converted into C, M, and M before printing. Y, K mode, that is, color
separation processing. The so-called "color separation" is to
decompose and convert the color information of each pixel of the image (usually
R, G, B color information) into color information suitable for printing C, M,
Y, and K modes. In color separation, only by setting the color separation
parameters correctly according to the printability of ink, paper, etc., can it
be possible to output high-quality color separations and minimize the loss of
color information.
Color
is very important for color book printing, which directly affects the quality
problem after printing, so the problem of printing color distortion must be
paid attention to.