RE:[OT] Dot shape prevalence
RE:[OT] Dot shape prevalence
- Subject: RE:[OT] Dot shape prevalence
- From: "Abe Hayhurst" <email@hidden>
- Date: Thu, 6 Oct 2005 12:43:26 -0700
- Importance: Normal
- Organization: We Do Graphics, Inc.
I actually use Heidelberg's Irrational Screening with a round dot at 240
linescreen. Obviously as you go to higer line screens, there is
increased dot gain. The round dot minimizes that dot gain. The dots do
not touch until 70 percent.
The reason behind placing magenta at 45 degrees is so that you have 45
degrees between the angle of the yellow and the angle of the magenta
(with yellow normally being at zero degrees). The problem with black at
a non-45 degree angle is that you can see saw-tooth. I want the best of
both worlds, so I use a screen/angle set that puts cyan at 15 degrees,
magenta at 75 degrees, yellow at 30 degrees, and black at 45 degrees. So
I get 45 degrees between magenta and yellow and keep black at 45
degrees.
There are only 2 vendors that I know of that offer angle sets with
yellow at 30 or 60 degrees: Agfa and Heidelberg.
An excellent resource on different types of screening, dot shapes, and
angle sets is Heidelberg's "Introduction to Screening Technology", which
can be downloaded free at:
http://www.heidelberg.com/wwwbinaries/bin/files/dotcom/en/products/prine
ct/screening_technology_eng.pdf
Abe Hayhurst
We Do Graphics, Inc.
1150 N. Main St.
Orange, CA 92867
714-997-7390
email@hidden
-----Original Message-----
Message: 4
Date: Thu, 06 Oct 2005 07:25:55 -0400
From: Roger Breton <email@hidden>
Subject: [OT] Dot shape prevalence
To: ColorSync <email@hidden>
Message-ID: <BF6A8203.12D17%email@hidden>
Content-Type: text/plain; charset=US-ASCII
I'm doing an informal survey about which halftone dot shape has gained
widespread acceptance in printing these days? Is it Eucledian or
Elliptical? I suspect Eucledian is probably more widespread because it
is the default dot shape in most PostScript RIP. But I can't say for
sure.
And what is the current practice when printing portraits and skintone: I
gather that placing the magenta in the angle of the black gives "better"
results. Is there any truth to this? Or is that all taken care by the
more advanced screening techniques such as Irrational Tangent?
I was searching through the SWOP 10th Edition booklet in the hope that
it would have a recommendation on screening but, alas, nothing. Unless I
missed it :(
Regards,
Roger Breton | Laval, Canada | email@hidden
http://pages.infinit.net/graxx
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