FW: Scanner profiling problem (DT-S1030AI)
FW: Scanner profiling problem (DT-S1030AI)
- Subject: FW: Scanner profiling problem (DT-S1030AI)
- From: "Mike Eddington" <email@hidden>
- Date: Fri, 23 Mar 2007 11:12:43 -0400
- Thread-topic: Scanner profiling problem (DT-S1030AI)
>>I do get rather different figures when testing "Q60E1 rifilata.tif"
>>against the "DTS Q60E1 3.1 20-03-07.icc" using lprofs profilechecker:
>>
>>Average dE: 3.21
>>max dE: 7.84
[]
I believe this is a discrepancy in the delta E formula. The report I generated out of ColorThink Pro used delta E 94 (as shown in the heading above the delta results in my original post, though admittedly it would be less ambiguous if the report displayed "average dE94: 1.55"...maybe Steve Upton can fix this as I know he has lots of free time ;) ).
Anyway, if I calculate using dE76, the results are nearly identical to yours...
Ave. dE76: 3.21
Max dE76: 8.14
Just for fun, I generated profiles from the Q60E1 rifilata.tif and E1200604_Q60.txt files using both Gretag ProfileMaker 5.0.8 and Monaco Profiler 4.8. The Gretag profile is nearly identical to the DTS Q60E1 3.1 20-03-07.icc provided by Giordano, but the Monaco profile, though it appears visually consistent with the gretag profiler when assigned to an image, looks very different in ColorThink Pro, particularly when graphed.
The dE report is significantly better when using a Monaco profile:
Ave dE76: 1.10
Max dE76: 8.97
...but the biggest difference is in the 3D graphs. Gretag's profiles (both mine and Giordan's) show a significantly smaller volume and a wedge missing out of yellows and big time curves in the yellow and blue primaries. Looks like Monaco extends the white point to an L* of 100 as well. Anyone care to comment on the differences between Gretag and Monaco Input profiles, in particular how they graph? (I originally posted a screen shot of the graphs, but not sure if it will make it to the list or not).
Michael Eddington
North American Color, Inc.
www.nac-mi.com
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