Re: US Sheetfed Coated v2 TR001?
Re: US Sheetfed Coated v2 TR001?
- Subject: Re: US Sheetfed Coated v2 TR001?
- From: "Terence L. Wyse" <email@hidden>
- Date: Wed, 7 Apr 2004 10:15:47 -0400
The C/M density swap (SWOP??) was probably just a typo on Jim's part.
As far as the dot gain goes, I'd suggest it's closer to 24% or so based
on the tone repro characteristics of several presses I've profiled. I
can guarantee you it wasn't done with linear CTP!
And I guess we have the "official" answer from Adobe: it wasn't a press
run at all but simply an analog Matchprint on Commercial base that they
profiled!
I've looked at DTR-004 and it's not all that good, at least for gray
balance. Looks like to me like they ran the yellow density to high
during the run, either that or it has something to do with the yellow
being contaminated with magenta ink that they mentioned in the report.
I've run into that myself when calibrating/profiling a press that runs
the typical KCMY (K first, Y last) sequence. The yellow ink train tends
to get contaminated pretty quickly, especially if the ink fountain
starts to run low. The other possibility is that the screening they
used had a higher screen ruling on the yellow angle. This is VERY
typical. Rampage's RCS and Harlequin's Precision Screening both will
run the yellow at roughly 10% higher linescreen than the other angles
resulting in higher yellow dot gain than expected. Not a problem if you
compensate for this in the plate curves.
BTW, I profiled a 6-color Komori just last week that ended up matching
TR004 better than DTR004 does! Gray balance came out spot-on at
50c/40m/40y. We simply ran to GRACoL SIDs, adjusted the plate curves to
hit the recommended dot gain and we nailed it. Virtually the same thing
happened with the uncoated stock press run.
Later,
Terry
On Apr 7, 2004, at 8:36 AM, Roger Breton wrote:
My guess is that the
solid densities are some thing like this C= 1.4, M=1.3, Y=1.0 K-1.5.
And
the dot gain is around 20%. I am sure mileage will vary.
My .02
Jim Rich
Jim,
Are you sure you have those last figures right? I would expect magenta
to be
higher density than cyan. That's what I see at most printing outfit,
personnally. And SWOP and Gracol's density guidelines are like that. I
have
not checked ISO-12647 data to see if I can push the generalization.
I've
always been under the impression that, maybe for ink tack formulating
reasons, that cyan density ought to be lower than magenta.
_____________________________
WyseConsul
Color Management Consulting
email@hidden
704.843.0858
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