Newspaper printing is different from the traditional commercial printing, newspaper
printing substrates for newsprint, most use of high-speed rotary press, the
expansion of the network and the expansion of paper and commercial printing are essentially different, so in the print front-end images and typesetting, to
be adjusted to meet the printing requirements.
1. The
level of adjustment
The purpose of the level of adjustment is to meet the printing
requirements, according to the characteristics of the newspaper printing dot
increase rate of high, to compensate for the increase in the network, the main
level is concentrated in the middle of the region, that is, 20% to 60% of the
visual sensitive areas, The tone of the original corresponds to the tone that
can be reproduced by the printing to the utmost extent so that the image is
clear and true. Secondly, according to the content of the original manuscript
and the distribution of the levels, it is necessary to ensure the accuracy of
the key positions. For example, the faces of the characters must be clearly
layered and the values of very high light or dark shades must be adjusted.
2. Mode conversion
The image mode used for printing must be CMYK mode. Note the color
separation settings in the image processing software. Setting this parameter
correctly is critical to getting a good print color. Dot increase of about 30%
of the total volume of 220% to 260%, using GCR, black version of the tone,
black version of the beginning of more than 30%, the maximum black version of
85%.
3. Adjust the image size
In the grouping process, do not arbitrarily enlarge or reduce the
image in the grouping software, which will lose a lot of image information,
causing the printed image to be false or dark. If you must change the image
size, you should go back to the image processing software for editing. This
will maximize the image information.
4. Small font processing
Newspaper printing speed, network expansion rate, there is no
commercial printing so high overprinting accuracy, if the layouts in the use of
multi-color trumpet font easy to produce fonts are not allowed to lead to fuzzy
font ghosting, empathy not in multi-color Overprinted images use small white
letters.
5. Edition version of the cover color
To chromatic dominated by bright colors. Newsprint uncoated,
background, bright colors conducive to the layout with a bright feeling. Color
to be saturated. Rough newsprint, printed mesh coarse, saturated colors more
eye-catching. Nowadays, many newspapers purchase digital proofing system. The
system generally uses the international common ICC color correction. The color
conversion fully takes into account the color gamut of newspaper printing.
Combined with the characteristics of newspaper printing, it ensures the color,
level detail, Contrast with the final printed newspaper highly consistent.
After adjusting the image grouping, Shanghai business card printing can use
this testing method to improve the quality of the whole newspaper image and
group edition, especially the printing effect of the advertisement picture.
Of course, plate making is also an important factor affecting the
quality of newspaper printing. Newspapers are now generally divided into two
types of technology. A typesetter for film output after the sun PS version. The
use of this process we want to strictly control a few important data, color
separation film should be above the field value of 3.2, the film base of the
haze (including multi-layered base superimposed) should be less than 0.15,
color film The linearity error should be plus or minus 1%.
6. Image adjustment color mode
To try to restore the true color and richness of the image, the
image color must be adjusted in RGB color mode. When working with images in
Photoshop, selecting RGB mode is more effective than selecting CMYK mode.
Handled in RGB mode, and then converted to CMYK mode. When using Photoshop
scanning, simply select the RGB setting option in the Color Settings option and
the color image entered through the scanner is RGB. Because the gamut of RGB
mode is much larger than the gamut of CMYK mode, the color information can be
fully reflected. Processing the image in RGB mode will result in wider color
space and more processing effects
7. Sharpness adjustment
Newsprint printability determines the number of pictures in the
color newspaper hanging network line is not too high, usually about 90 lines to
110 lines, so the image adjustment needs sharpening to improve image clarity.
The degree of sharpening is related to the type of the original image and the
zoom ratio. Generally, the sharpening degree of the character image is smaller
while the landscape draft can be larger; the larger the image, the sharpening
degree is larger; the higher the magnification, the sharpening degree but also
deeper.
Another technology is the computer plate directly. It breaks through the traditional platemaking process to go
through the laser light film output film and artificial imposition, copy the
limitations of the two processes to avoid the printing plate in the process of
exposure time differences caused by flower marks, network variation, network
inconsistencies and hand spelling , Copy errors and errors caused by copy. Color newspaper need more accuracy overprinting, plate making
speed, shorten the printing time, extended newspaper news deadline. Therefore,
the rapid spread of the technology in various newspapers, the plate making
process uncertain factors less real in the process of plate-making data and
standardization. In the
production process we should pay attention to the plate setter output linear,
to ensure that the percentage of output outlets, the correct control of the
version of liquid temperature and replenishment on it. Direct
plate system is a digital workflow, direct plate making machine, digital
proofing, automatic bending plate drilling machine composed of all-digital
plate-making process, the introduction of this process of newspaper printing
quality standardization, data control has played a catalytic role.
