Re: [OT] Dot shape prevalence
Re: [OT] Dot shape prevalence
- Subject: Re: [OT] Dot shape prevalence
- From: "RS" <email@hidden>
- Date: Mon, 10 Oct 2005 10:59:07 -0700 (PDT)
- Importance: Normal
Roger,
As noted on page 37 of Heidelberg's "Introduction to Screening" guide, in
the RT Y45 K fine screen system the relative frequencies for the inks are:
C-1.054, M-1.054, Y-0.943, K-1.414.
There is an IS Y fine screen system in which the yellow line screen is
higher. In this system, the relative screen frequencies are (see p. 27 of
the guide):
C-0.943, M-0.943, Y-1.414, K-0.943
email@hidden
------
Roger Breton wrote:
>> Your black dot gain will be much higher with the RT Y45 K fine screen
>> system because your black line screen will be much greater than normal.
>
> I'm well aware of that. Athough I was under the impression that it was the
> yellow (1.41x 150lpi) that will take the most hit. From what I remember
> CMK
> all screen at 0.9143x 150lpi. Or maybe I got the Y-fine lpi ruling?
>
>> You should first run a form with a gray ramp to determine the black dot
>> gain associated with the RT Y45 K fine system and build a new
>> calibration
>> curve to compensate for it before you image your plates for the test
>> form.
>
> Yes, we're starting linear and measuring a series of ramps from which
> we'll
> make "calibrated" plates. I wonder how good are Harmony calculations?
>
>> email@hidden
>
> Roger Breton | Laval, Canada | email@hidden
> http://pages.infinit.net/graxx
>
>
>
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