What should be paid attention to in prepress design?

Bleed settings


Bleeding in printing refers to the pattern of increasing the outer size of the product, and adding some pattern extensions at the cutting position, which is specially used for each production process within its process tolerance, so as to avoid the white edge of the cut product or the content of the cut.



During production, it is divided into design size and finished product size. The design size is always larger than the finished product size. The larger edge is to be cut off after printing. The part to be printed and cut out is called Typographic bleed.

Generally, when printing design, set 3mm bleed on each side. For example: 200mm×150m finished product is required, that is, 206mm×156mm file is set. The bleed line and the print size line are not necessarily 3mm, but 5mm can also be left, which is determined by the thickness of the paper and specific requirements.


For example: ordinary posters, samples, DMs, etc. can leave 3m of blood. The product packaging box should be properly adjusted and kept larger. For example, a 3-layer corrugated box should leave at least 4~5mm of bleeding, and a 5-layer corrugated box should leave 8mm~1cm of bleeding. Why keep it so big: The main reason is that the plate is thicker, and the color other than bleeding will be exposed when the crease is made, so the product is not beautiful.


Cutline drawing


The bleed line is also called the cutting line, and its function is to mark the safe range, so that the cutter will not cut the content that should not be cut.


Color Mode Check


The color mode of the file in printing should be CMYK, so in the pre-press design, you should check the file properties in the file menu to see if any elements are in the RGB color mode. If there is, you need to convert it to the CMYK color mode.