Bleeding
Why we need bleeding?
Because you want us to print your picture all the way to the
edge of the paper, such as this postcard:
and we simply cannot do it.
What we are able to do, is to print a larger image on a
bigger piece of paper, then trim off the excessive parts (as shown below). These
excessive parts are the bleeds.
Remember, the bleeds must be extensions of your image,
rather than something else. I once asked a designer to add bleeds to his
artwork, he just added white borders, like this:
With this file, it is not possible to make “clean cut” and
you will see minor white edges here and there, which means “not clean” for you,
and “bad product” for us.