What is print bleeding?

Print bleeding is used to ensure that when your printed material is cut to size, there is no white edges around the printed material. Since the printing process may move a few millimeteres from one print to the next, when the cutting happens, you may end up with one or two borders with a white line. We do not want this, so we print a slightly bigger image, and then cut the material slightly smaller than the image, so we are sure not to have any unprinted edges.

When asked "what is print bleeding", the below image explains it best, thus you must always ensure that the printable area of your image is within your print bleeding range:

What is print bleeding, is normally asked in order to find out how to design for print bleeding, you should plan for at least 3mm of print bleeding around your images. at 300dpb, 3mm of print bleeding means around 40 pixels extra around your image.

Thus preparting a print bleeding would result in the following:

 

So when preparing a document for printing you need to create various printing marks which indicate to the printing company where to trim the paper. The page boundaries need to be expanded in order to accommodate the printers marks. This area outside the image and print bleeding is called the slug area, which contains printer instructions and possibly print job sign-off information.

If you are setting crop marks and want the artwork to contain a bleed or slug area, make sure that you extend the artwork past the crop marks to accommodate the bleed or slug. Also make sure that your media size is large enough to contain the page and any printer’s marks, bleeds, or the slug area. If a document doesn’t fit the media, you can control where items are clipped by using the Page Position option in the Setup area of the Print dialog box.

If you select the Crop Marks option, fold marks are printed as solid lines when spreads are printed.

More information about printers marks.

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