Re: 100% GCR with UCA?
Re: 100% GCR with UCA?
- Subject: Re: 100% GCR with UCA?
- From: "Stuart Peel" <email@hidden>
- Date: Tue, 21 Oct 2003 03:26:57 -0700
- Priority: normal
- Thread-topic: 100% GCR with UCA?
<-----Original Message----->
From: email@hidden
Sent: 10/17/2003 3:14:01 PM
To: email@hidden;email@hidden
Subject: Re: 100% GCR with UCA?
In a message dated 10/17/03 7:09:41 AM, email@hidden writes:
I have a copy of ProfilierPro, however, the solution is required
for a
newspaper printing environment, what are your opinions with
regards to
this? Is it a feasilbe solution?
Can one profile a printing press with ProfilerPRO? Absolutely, I've seen
some great results. Is it frequently done? No, since thats not a market
that ColorVision sells to.
.......OK! taken on board :-)
It would appear that there isn't a simple interface (custom
curves) to
set UCA as well as setting GCR in any current profile package.
Is that a
fair conclusion?
If you think, not of buttons with these names, but of the effects these
functions create, then my last post covers your goals already. UCA means
adding color back in, instead of black. Gray component removal is one
recipe for removing balanced amounts of colorants and replacing with
black (or with newer inkjets, actually replacing with gray in some
cases). There is no way to do both these contradictory things in
different sections of the density range via buttons; you need to do it
by drawing your own black generation curve, with your own toe, and
controlling it there. Pushing the curve near to the right hand wall of
the graph is effectively Under Color Addition, since it is using more
color and less black for that section of the range.
....Understood. Thank you David, that was a most helpful description of
what I want to acheive.
Nailing a toe point to the bottom of the graph is effectively replacing
all Gray Component with colors up to that point on the graph. Buttons
are one dimensional; graphs are two dimensional. Your needs are too
complex for a one dimensional solution.
.......Agreed, I was hoping that there was a package available that
provide curves (CMY) that could be customised to effect UCA. Perhaps you
can clarify my concerns over the late black start. Will this not affect
the GCR settings? I need all neutral images to be replaced with pure
black, as far as is possible. Will not the late black start undo what
the GCR settting has done up until the point where the black chanel
start is defined by the custom curve? Perhaps the black should start at
zero?
Thanks again, this is a valuable post to me.
Kind regards,
Stuart Peel
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