#Print 1 color ovr anothr
7 messages in this thread
When I want to print one color over another (i.e., black type over solid
blue background), is it important to reverse out the blue from the
background where the black type will go? Does this cause registration
problems? Is it important to reverse out the type when a lighter
background (i.e., yellow) or a screened background (i.e., a 25% screened
blue) is used?
Thanks for any advice on this… -bg
From my experience, we generally overprint the black layer…you will have
registration problems if you cutout the letter's shape from the blue (or
yellow) background, unless you trap your letter by stroking it. It is
difficult for most presses to hold perfect registration…the darker your
background color, the more noticable the white (or whatever your paper col
color is) line will be when the letter doesn't land directly in your
knockout. If your letter is, say, yellow on a blue background, you have to
knockout your letter since the color (yellow on blue) will dramatically
change the color of your letter….
Bill –
If you're overprinting BLACK, is better to NOT reverse out athe background.
If you're overprinting another color, you have to reverse out the
background to avoid color shifts.
One of the trick that film houses use to get really good black backgrounds
is to run 70% cyan behind it — it makes it MUCH blacker.
If you are overprinting on an obvious pattern (like stripes) then you have
to reverse out the background, or it will show through even black.
— don
I've known color printers who printed *all* colors under the black to get a
really dense, rich black. Sounds like overkill to me, but, hey, I'm not a
printer…
to: Bill Gordon 76010,3466 from: Martin Greenberger 76116,1502
Subject: Printing black over color It is generally ok to print black
over whatever other color. Sometimes you will see a color shift where the
undercolor makes the black denser. Don't print 70% cyan under black, use
about 30% or you will have a definite blue cast. Don't print 100% of all 4
colors–it is virtually impossible to print that much ink on multi-color
presses, and it is very susceptible to color shifts.
Tripp –
It is overkill. There is also some danger in putting too many layers of ink
over each other. I'm not a printer either, but what I've heard is — it can
pick up the old layers of ink and leave white spots.
— don
It also causes the paper to stick to the blanket, as the old ink is
"sticky" and when you try to lay new ink on top of it, they'll stick to
each other…causing the press to "inhale" paper and get all choked up.
–Thom