RE: Scanner profiling problem (DT-S1030AI)
RE: Scanner profiling problem (DT-S1030AI)
- Subject: RE: Scanner profiling problem (DT-S1030AI)
- From: "Mike Eddington" <email@hidden>
- Date: Wed, 21 Mar 2007 16:32:53 -0400
- Thread-topic: Scanner profiling problem (DT-S1030AI)
>>The profiles I build seem to invariably and significantly
>>darken my scans.
The profile itself doesn't look too bad, meaning its doing the best it
can with the provided scan and reference data that created it. Using
ColorThink Pro to do a quick analysis (opening Q60 scan, assigning
scanner profile to derive Lab via abs. col. Rendering, and comparing
with the reference file), gives the following results:
--------------------------------------------------
dE Report
Number of Samples: 264
Delta-E Formula dE94
Overall - (264 colors)
--------------------------------------------------
Average dE: 1.55
Max dE: 2.77
Min dE: 0.23
StdDev dE: 0.44
Best 90% - (237 colors)
--------------------------------------------------
Average dE: 1.45
Max dE: 2.11
Min dE: 0.23
StdDev dE: 0.36
Worst 10% - (27 colors)
--------------------------------------------------
Average dE: 2.34
Max dE: 2.77
Min dE: 2.11
StdDev dE: 0.18
--------------------------------------------------
--------------------------------------------------
That's about on par with profiles I get generated by Gretag Profile
Maker. Looking at the scan of the IT8 compared to IT8 scans from my Hell
3800 scanner, it looks pretty light in comparison. I threw a curve your
Q60 scan to darken it up a bit(as other have suggested), then created
the profile and the results were not quite so dark.
In addition to checking for any auto features in your scan set up, you
also might want to evaluate your it8/Q60 target itself. Does it appear
to have faded? You might want to measure it with a spectrophotometer and
create a new reference file (if you have that ability). IT8 Photographic
targets can last a long time if cared for properly, but I've seen some
bad ones before.
_______________
Michael Eddington
North American Color, Inc.
www.nac-mi.com
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