Need to understand printing in design

1. The image quality has the greatest impact on the print quality. When using some scanned images, the contrast in the computer display will not be obvious, but it will be quite grey when printed.
So be sure to check the contrast of each image very carefully before leaving the film.
There are many specific inspection methods, one of which is listed here:
In PS, press Ctrl+L to adjust the scale panel to see the middle distribution. If you focus on the middle, the contrast is poor. If it is focused on the left, the explanation is too bright. If it is focused on the right, it is too dark.
The best distribution is uniform.
Adjust according to specific needs.

2, before the channel out of the film, we must check each channel. This problem is mainly concentrated in the PS, IA and other professional printing and publishing software does not have this problem.
Checking the distribution of ink in each channel is to avoid overprinting.
Very small lines must use a single color, if the customer needs to use the most double color, if the four-color overprint is very easy to overprint.
The small text must be in monochrome, and the monochrome here refers to CMYK. And be sure to use overlays to overlay layers.
Put a different color on a large area of ​​the background color, must use overprinting, can not use overprinting, otherwise the effect will be printed out is very serious.
The above are the three main issues, and there are also some minor issues that are welcome to add.

3, bleeding bleeding in the design of the printing manuscript must be added, the standard bleeding is up and down about 3mm, bleeding lines do not need to add.
Care should be taken in the design to prevent images and text from appearing in the bleeding area. This is also an important issue for inspection before going out of forest.
In the folded design, no bleeding is needed in the middle.

4, postpress processing in the design to take into account the latter way of processing.
Take a design document bag as an example: (440*305 plus 10cm tongue)
The tongue of the document pocket is printed together with the front face, so the height of the design document is 305 plus 3mm bleed plus 10cm tongue total 408mm, width 440 or so plus 3mm bleed plus 7mm hem for a total of 460mm.
It is best to add a hemming line when designing.

5, a variety of printing methods for the design of the document requirements General offset printing for dot printing, mainly used to print a continuous transfer image, the resolution is 300DPI, the color mode uses CMYK.
Large areas of color and the need to use the gravure in the field, the best vector design.
The packaging printing uses a resolution of 150 DPI and the color mode is CMYK.
The advertising room is inkjetted at 100 DPI and the color mode is RGB.
Outdoor spray can be adjusted depending on how close the advertisement is placed to the viewer. It is generally 45 DPI and the color mode is RGB.

6, how to reduce the printing costs through the design Most printing plants currently use 4K machine printing, so put together in the design of several files to make up a large number of printing plate costs and printing. The printing fee is calculated separately. The difference between them can even exceed 10%-40%, the smaller the print, the greater the difference.
Therefore, if possible, spell out your own file (if multiple, and print on the same paper) as 4K or off before going out of the forest.

7, with the color Some customers will provide the previously printed products or other finished products on the color, need to be printed in and similar to the previous or the same color.
Prior to design, the color tone should be determined according to the chromatogram. PANTONE is generally used.
The samples are then provided to the printer at the time of printing, and they are instructed to dispense the ink in accordance with the color tone. Experienced printers can print colors that are almost the same color as the sample.

There are also some problems encountered in daily life. Welcome to discuss them together.