Re: Editing Adobe Profiles
Re: Editing Adobe Profiles
- Subject: Re: Editing Adobe Profiles
- From: Marco Ugolini <email@hidden>
- Date: Mon, 23 Jul 2007 15:15:49 -0700
- Thread-topic: Editing Adobe Profiles
In a message dated 7/23/07 1:07 PM, Groana Melendez wrote:
> Is it possible to edit existing profiles such as, U.S. Sheetfed
> Coated v.2 with ProfileMaker 5.0? I've noticed that instead of
> loading an existing .txt file or selecting an instrument to read in a
> new target, that I can import an icc profile and select a new cmyk
> separation. But is this an effective way of working?
>
> I prefer US Sheetfed Coated v2 to some of the custom profiles I've
> created for releasing images in the US (to unknown presses); but I
> would like to control it's black generation and ink limit.
>
> I would greatly appreciate any feedback.
I myself have done what you describe here. It was an instance in which I was
compelled to use the U.S. Sheetfed Coated v2 profile, but the client wanted
a high black generation in order to ensure better neutrality on press, since
the product was a line of grayish-looking electronics.
I used ProfileMaker 5 to load the CMYK reference file first (in my case,
TC3.5 CMYK i1(A3).txt), then imported the U.S. Sheetfed Coated v2 profile
(Measurement Data > Import ICC Profile). At that point one can set the
separation parameters (in my case, MaxK, a TAC of 340, and a Black Width of
100, with Black Start set to taste), click on the "Neutralize" button in the
"Define Black Point" area, then produce the profile with a modified black
generation.
As you see, this is not so much a profile edit, because, instead of tweaking
the A2B or B2A tables, we are actually building a completely new version of
the original profile starting from a virtual dataset, which is obtained by
means of a standard CMYK reference file, since we don't have direct access
to a genuine colorimetric or spectral dataset from an actual print run.
Though this way of rebuilding the profile presents obvious risks of
inaccuracies due to the compounding of rounding errors with the lack of
actual colorimetric/spectral data, I did achieve satisfactory results for my
purposes.
I wouldn't recommend that this workaround be used too often, and certainly
not without caution, but it seems to provide workable results.
Marco Ugolini
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