Re: Can this be done?
Re: Can this be done?
- Subject: Re: Can this be done?
- From: Terence Wyse <email@hidden>
- Date: Thu, 28 Aug 2008 12:17:59 -0400
On Aug 28, 2008, at 12:00 PM, Marco Ugolini wrote:
Richard Apollo wrote:
So, with a device link, gamut compression would be calculated
directly between the two color spaces?
@Richard:
Not neccessarily. Depends on the device link software. Unless you see
some adjustment in the software for, say, "clipping" vs. "details",
chances are it's doing the gamut compression the same way had you done
just a simple ICC profile conversion. There's considerable "secret
sauce" in the various device link applications, especially when you
get to the more "proprietary" ones such as GMG and Alwan. For example,
some of the more advanced features of Alwan device links are only
accessible via their workflow product, CMYK Optimizer, and not
available in their "static" device link product, LinkProfiler.
Much of it depends on workflow. CMYK Optimizer is a great choice for
up-stream conversions (upstream of your prepress system that is) while
LinkProfiler works well for downstream or "late-binding" conversions
WITHIN a prepress system when you can apply the link just ahead of
plate output (my personal preference). Both CMYK Optimizer and
LinkProfiler CAN work well in the late-binding scenario but much
depends on your prepress system and the internal format it uses. If
it's a "PDF-based" workflow, you can usually insert CMYK Optimizer
into the workflow via watched folders. If your workflow internal
format is more "proprietary" in nature (Scitex CT/LW, Rampage, etc.)
then LinkProfiler works well.
One of the things I know about device links is that they don't use a
PCS (Profile Connection Space). The conversion is directly from one
lookup table (source) to another (destination).
The lookup tables of the DVL (device link) include descriptions of
both source and destination space, and are built via a PCS at the
time the DVL is created, plus any special features that are chosen
by the user (clean primaries, K-only blacks, etc.). From that point
on conversions happen without any need to call upon a PCS.
Yes, to clarify, the PCS still gets used when the device link is
created so in that respect its not much different than a standard ICC
conversion. Once the PCS is used to build the LUT, it's then
"discarded" and what your left with is a direct CMYK-to-CMYK (or RGB-
to-CMYK) LUT...with special features of course.
Terry
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