Re: US Sheetfed Coated v2
Re: US Sheetfed Coated v2
- Subject: Re: US Sheetfed Coated v2
- From: bruce fraser <email@hidden>
- Date: Wed, 7 Apr 2004 08:53:10 -0700
Peter,
If you can confirm this, and pass it on to the application teams and
to Thomas Knoll, who made the profiles, that would be very useful.
Thomas was under the impression that the data had been collected from
an actual press run, but I dont think he was in the loop until he was
handed the measurement data.
I don't have any of the original profiles left to make the
comparison, but I think the v2 profiles were indeed made from the
same data set. Thomas would know that for sure.
Best,
Bruce
At 1:33 AM -0700 4/7/04, Peter MacLeod wrote:
I don't know whether the source data changed between the U.S.
Sheetfed Coated and U.S. Sheetfed Coated v2 profiles--I don't think
it did. (That should be easy enough to verify by looking at the
device->PCS tables, unless they were re-gridded, but I haven't
looked). If that's the case, I can tell you exactly what the
original data was: it was measured from MatchPrints pulled from
175-line screen film on the MatchPrint Commercial substrate. At the
time, there was no viable standard dataset for U.S. commercial
printing.
--Peter
It would have been a good idea if Adobe had documented the print
conditions that US Sheetfed was meant to represent, but alas, they
forgot, and the information is no longer recoverable-I've tried. (!)
The paper stocks were quite different, as noted by Chris. The ink
hues are pretty similar-the biggest difference is in the magenta,
and it's not clear whether the difference is entirely attributable
to the paper of they were in fact different inks. Again, it would
have been useful to know that.
The way the tone curves run seems to suggest a 175-lpi screen (or
wildly uncontrolled dot gain for a sheetfed press).
And that's about all anyone has been able to determine!
Bruce
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