- May 1, 2004Thank you everyone for sharing your wisdom.
--- Gary Mordhorst <gary@...> wrote:
> Print your color (burgundy or goldenrod) first and"http://rd.yahoo.com/SIG=129fbo998/M=295196.4901138.6050264.3001176/D=groups
> print black on top of the
> color. Keep your trap at 1/2 point, or overprint,
> based upon the nature of
> the image.
> Black ink has enough density to overprint most
> colors. The big exception to
> this is in the case of metallic inks, which have
> metal shavings in the ink,
> making them more opaque than black.
> Gary Mordhorst
> AccuColor Plus, Inc.
> on 5/1/04 11:33 AM, Roderick at rxchow@...
> Michael (et al):
> I'm printing black and burgandy for one set and
> and goldenrod for another set. If I place black down
> first, then burgandy (goldenrod) will trapping at
> (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
> to decide is how much overhang is acceptable to me.
> I correct?
> I've printed a few two color jobs with colors in no
> particular order and never specified trapping
> 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
> > 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.
> > rules and text
> > characters are themselves thinner, or not much
> > broader than this, and
> > if the trap is coming in from all directions, such
> > large number will
> > effectively result in an overprint.
> > Michael Barnes
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