Bleed is a printing term that refers to printing that goes beyond the edge of the sheet before trimming. In other words, the bleed is the area to be trimmed off. The bleed is the part on the side of a document that gives the printer a small amount of space to account for movement of the paper, and design inconsistencies. Artwork and background colors can extend into the bleed area. After trimming, the bleed ensures that no unprinted edges occur in the final trimmed document.
It is very difficult to print exactly to the edge of a sheet of paper/card so, to achieve this, it is necessary to print a slightly larger area than is needed and then trim the paper/card down to the required finished size. Images, background images and fills which are intended to extend to the edge of the page must be extended beyond the trim line to give a bleed.
Bleeds in the US generally are 1/8 of an inch from where the cut is to be made. Bleeds in the UK and Europe generally are 2 to 5mm from where the cut is to be made. This can vary from one print company to another. Some printers ask for specific sizes; most of these companies place the specific demands on their website or offer templates that are already set to their required bleed settings.
Set up your publication for bleeds in Adobe Indesign.
1. Open your InDesign document and go to File > Document Setup
2) If you do not see the Bleed and Slug section, select the More
3) In the Bleed and Slug section, set all fields to .125” and click OK.
When creating bleeds, we recommend that all text remain within the .5” margin, unless this is a chosen design style. When working with bleeds, all content that should bleed must be extended .125″ beyond the page edge. This portion will be trimmed after printing.
4. A red line will appear on the outide of your page area. All content
that should bleed off the page should extend to this red line. Note that
anything that extends pages the black page boundary will be trimmed
off in production. 5. When creating your PDF, be sure to choose the Use Document Bleeds
Settings option in the PDF options window under the Marks and Bleeds
section. See TechKnow lesson: Creating a PDF for more information on
how to create a PDF with bleeds.