Re: DTP41 question
Re: DTP41 question
- Subject: Re: DTP41 question
- From: Raymond Cheydleur <email@hidden>
- Date: Mon, 18 Apr 2005 07:05:39 -0400
I recommend buying the raised white ceramic insert for the DTP41 If you
are trying to match data sets created by measuring over white or
multiple sheets of substrate. This has two benefits: It matches the new
standards for white backing that CGATs has created and also reduces the
problem in some substrates of a change in height in the optical path at
the end of a row on targets with a short paper trailer.
RayC
On Apr 17, 2005, at 6:03 PM, Neil Barstow wrote:
Hi Rolf
something that is really important here is how the reference file was
created. That's the reference file you use to create the proof AND to
measure the printed FOGRA strip against. color-solutions basICColor
Control does a great job of measuring and verifying the FOGRA strip
with many supported instruments, maybe try an iOne and then you can use
a few sheets behind. [as long as the reference is sb (self backing)].
ISO 12647-2 2004 provides colorimetric data on black backing aswell as
white (white being informative only). But there are not enough data
points to use this reference as a source to check the FOGRA wedge
against.
SO the nearest thing we have to ideal ISO profiles off the shelf are
from the eci. more later.
email@hidden (Rolf Gierling)::2/3/05::11:13 pm:: GMT+0100
Hi to all,
I'm trying to match a proofer and paper to the FOGRA mediawedge.
The rule is that the proofer paper has to match within a range of
deltaE 3 to the press paper, which is european sheetfed coated.
european sheetfed coated?
do you mean ISOcoated.icc? (an <Altona> profile = white backing) or the
earlier profiles with sb or bb suffixed [sb=self backing, bb= black]?
Now here is the problem: It seems that the white backing of the DTP41
is not white enough:
If I measure normally (e.g only the paper sample), deltaE is about
3.6.
If I measure with another blank sheet of the paper underlaying, deltaE
is about 2.6.
I've seen this for other reasons sometimes, maybe the proofer profile
is not so great, you may need a bigger target. Another thought, you are
using AbsCol - in the press profile>proofer profile transform, right?
[sorry, I had to ask].
Has anyone else seen this, or is my DTP41 simply dying?
some users tape a strip of the relevant paper to the front edge of the
41 so it sits atop the tile and allow the sample to be pulled over it.
It would be good to check the reference data and also to try another
spectro. I have found that the likelyhood of a low delta E is
increased much by using the same instrument to profile the proofer and
to verify those proofs.
Does your 41 have a UV cut filter?
Maybe you need a different proofer paper?
Best Regards
Neil Barstow
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