Re: Creating a SWOP proof with an Epson
Re: Creating a SWOP proof with an Epson
- Subject: Re: Creating a SWOP proof with an Epson
- From: Klaus Karcher <email@hidden>
- Date: Sat, 15 Jul 2006 22:00:22 +0200
Terry Wyse wrote:
In my opinion, a proofer
can and should be held to < 1 dE to it's original reference data. In
other words, a proof should not drift more than 1 dE from it's original
starting point.
I agree with you.
If it was me, I'd be looking for system that can get AT LEAST 1.5 dE
average from proof-to-press. Personally, I've not seen ICC-based
proofing systems that can consistently get under that figure and keep it
there by means of re-calibration/linearization.
In fact this is hard to ensure, taken into account that usual reference
profiles can "munch" a substantial amount of the tolerance window just
halfway (e.g. eci.org's "ISO Coated" causes an avg/max DE94 of 0.2/0.8
compared with FOGRA27, Adobes "Europe ISO Coated FOGRA27" causes an
avg/max DE94 of 0.8/2.8). Once again I want to affirm my view that
everyone should be able to verify the components of his workflow or
equipment without applying for sumptuous tables on ancient data media
;-). Device link profiles can simplify this approach, but it's not easy
to integrate them in a PDF/X workflow.
On the other hand, I've
seen a couple of non-ICC iterative approaches that can easily get under
.75 dE and even half of that (.35-.50)
Such figures come suspiciously close to the short term repeatability of
common measurement devices. GretagMacbeth names a short term
repeatability of "0.1 DE94 (D50, 2°), mean value of 10 measurements
every 3 seconds on white" for the eye-one. In practice I observed DEs of
0.2 up to 0.4 (stripe mode, various colors).
Regards,
Klaus Karcher
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