It is my opinion that in this case the darker color should go down last. The
trap may not show at all. Sometimes the printer gets lucky!
----- Original Message -----
From: "Roderick" <rxchow@...>
Sent: Saturday, May 01, 2004 9:33 AM
Subject: Re: [PPLetterpress]
Michael (et al):
I'm printing black and burgandy for one set and black
and goldenrod for another set. If I place black down
first, then burgandy (goldenrod) will trapping at 1/2
(assuming I'm registered) show all that much. Should
the client decide how much trapping I need? I'm
assuming not because I'm printing and not him, I need
to decide is how much overhang is acceptable to me. Am
I've printed a few two color jobs with colors in no
particular order and never specified trapping because
I just registered. Should I be putting down the
lighter color first then black or vice-versa?
Many thanks, Roderick
--- Michael Barnes <mjbarnes@...> wrote:
> Traps in offset printing are frequently .25 point
> (quarter point).
> Unless black is overprinting, a colour trapping
> under black can be
> considerably more (half a point) since it won't show
> much. Nowadays we
> trap even less -- around .125 pt -- because we are
> imaging to direct to
> plate, which has improved registration.
> Of course I don't know if numbers that work in
> offset also work for
> letterpress. But a 2 pt trap is certainly big. Many
> rules and text
> characters are themselves thinner, or not much
> broader than this, and
> if the trap is coming in from all directions, such a
> large number will
> effectively result in an overprint.
> Michael Barnes
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