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Why would you need to do that?
Imagine that you have to print a photograph onto a blank jig-saw puzzle. The puzzle is exactly 19cm x 27cm.
If the printed image is also exactly 19 x 27 then the alignment of the image with the jig-saw would have to be absolutely perfect in order to avoid misalignment resulting in fine unprinted edges?
The solution is to create a bleed and that means that you make the image slightly bigger than the object to be printed. When you do this the alignment of the print and the jig-saw is not so critical. It can be a little bit out and yet the print will still cover the whole area of the jig saw.
Printers that are able to print a white base under the coloured areas also can have the problem of fine tuning the alignment between the colour layer and the white layer. It only needs to be misaligned by a fraction of a millimeter and the result is that the white base might show along one or more edges.
The solution is to choke the white layer and that means to shrink the edges of the white area in very slightly.