UV filter or software correction or wp editing
UV filter or software correction or wp editing
- Subject: UV filter or software correction or wp editing
- From: "Roberto Michelena" <email@hidden>
- Date: Tue, 25 Apr 2006 19:55:25 -0500
Dear Fellow Listmembers,
I'd like to hear some informed opinions about which is the best way to
go, when dealing with proofing papers with high content of
brighteners.
Case in point, using the DTP70 the proof white measures b=-8.5 ; my
target to match is Gracol v7 Beta with b=-2.
So I can:
1) measure with DTP70 UV filter engaged, which gives me b=-3.2 ; the
highest dE (compared with the non-filtered measurement) is in white,
as it should (dE=5.8). However there are also differences up to 3dE in
other colors, mainly neutrals and cyans, even saturated ones.
2) try to 'fill in' the missing spectral values for ProfileMaker to
accept the data as spectral, and use the brightener correction in
software.
3) using Gretag's Profile Editor, select my Gracol Profile and my
Proof Profile (made without UV filtering or correction), select abscol
mode and the output Lab->device table, and then go to 'edit workflow
white point' which will allow me to tweak down the yellow that gets
added to the background.
Which is supposed to yield more realistic (iow: accurate in terms of
human perception) results?
I'm concerned that (1) may also be cutting out some ink fluorescence,
which should not be cut out since human vision does not adapt to it
(it does consider it, as opposed to white cast to which one adapts).
I'm not sure what does (3) does, if it's just a bad hack to do so.
And (2), well, filling in missing spectral values just doesn't sound
so right, does it?
best regards,
-- Roberto Michelena
Infinitek
Lima, Peru
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