So what’s the problem?
Can you imagine how hard it is though to cut exactly to the edge
of the image?
Especially as the image can shift a little bit during the run and can
even vary from sheet to sheet - especially when digital printing is
used where this variation can be us much as 2-3mm.
If we printed on a larger sheet then tried to cut a whole stack of
paper you might find that the top sheet is about right but the sheets
underneath will vary and white edges will show.
Image has shifted down & to the right
Image has shifted down
Image has shifted up
Image has shifted to the left