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Trapping
Tutorial
Knockouts
May Require Trapping
What
looks like two overlapping circles prints as a circle and
a crescent
In most cases, when two objects of different colors overlap they
knockout -- they won't print on top of each other.
In
the above illustration it looks as if a dark gray circle is
printing on top of a yellow circle. However, in reality a gray
circle and a yellow crescent shape are printed side by side
The yellow knocks out leaving white space for the gray circle
to print on.Because what you have are two touching colors there
is a chance that the colors can get out of register on the press.
Knockouts may require trapping to insure that no unsightly gaps
are left behind.