Re: Creating Press Sim Profiles
Re: Creating Press Sim Profiles
- Subject: Re: Creating Press Sim Profiles
- From: Chris Murphy <email@hidden>
- Date: Mon, 2 Dec 2002 19:29:25 -0700
On Monday, December 2, 2002, at 06:04 PM,
email@hidden wrote:
I get drawdowns from many printers - we do both SWOP and Packaging.
Our SWOP clients naturally get a SWOP setup. Many of our Flexo clients
use a variation of the FIRST ink standard (Flexo's attempt to
standardize.) However when I get drawdowns that require a unique
setup, I have to build one. My question is - is there any way build a
new profile when all you have is 4 CMYK solid drawdowns in your hand?
No. There simply isn't enough data. The minimum necessary information
for Photoshop to make reasonable separations are the primaries (4), the
overprints (3), 3-color black, and white. Actually white might be
optional - I haven't tried it. But a white measurement is pretty easy.
The other thing you need is some tone reproduction curve information
for the output method in question, which means you need dot gain at
~50% at a minimum. Really, for flexo printing you're going to need some
measurements in highlights due to the extreme high dot gain in flexo
printing, and the tendency to deal with this using transfer curves. So
figuring out highlight reproduction behavior is important, which means
they need to be sampled as well.
Also, a drawdown doesn't simulate 100% ink film thickness on press. So
the drawdowns aren't valid for characterization anyway. They're just
for process control, to make sure the ink batch you got this week is
what you're supposed to be using. That's it.
Chris Murphy
Color Remedies (tm)
Boulder, CO
www.colorremedies.com
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