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1. Tim D January 11, 2010 at 2:15 pm

   Bleed is the term for extending the background beyond the page, normally between 3 and 5mm extra in each direction.

   Bleed is required if the item you are printing has colour that goes over the edge, an example, you have an A4-sized page with a picture that you want to print a thousand off edge to edge, the printer might print on an A3-sized page and, once he has printed a thousand, trim it down to A4. Because guillotines are not 100% accurate and paper can slightly shift it is necessary to print slightly larger than A4 if you want to avoid unprinted strips on the sides.

   Trapping is the term for slightly overprinting elements.

   Trapping is required to avoid gaps between blocks of colour, an example, printing a red square with a black background, because printing machines cannot be 100% accurate it is necessary that the the edges of the square slightly overlap the background to avoid a white gap between the two colours.

   The most popular publishing softwares have trapping set up by default, occasionally printers will provide trapping requirements or they will adjust the files before they go to print, bleed isn’t a default (because you might not always require it) but is reasonably easy to do.

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