Re: i1 Scanning Table
Re: i1 Scanning Table
- Subject: Re: i1 Scanning Table
- From: Martin Weberg <email@hidden>
- Date: Tue, 2 Mar 2010 13:30:01 +0100
2010/3/2 Derek Lambert <email@hidden>:
> Sorry, forgot that we have scientists here. I will print ang make the test
> when I have a minute.
Great.
> I will use both non uv i1pro rev D (year old with minimal use as I have 4 of
> them) in iO rev 2 (2 weeks old) and non uv isis A4 rev A (about 3 years old
> but recently re-certified).
Really good information. If you find differences, it is between YOUR
devices in their current state. A general statement is not possible
without sampling a representative "population" of i1:s and iSis:s.
> I will print a chart for eack spectro and read each chart twice.
Twice is a start. But it really depends on the standard deviation and
the size of the differences that we would want to significantly
detect.
> Which chart should I use? Is 918 RGB from Bill Atkinson enough?
It will be enough, make sure it's a random layout. Make sure it fills
the paper to get data from all edges (spatial differences). Let the
charts stabilise enough to ensure no drifting during measurements.
> Or anyone has a different preference?
The output from PatchTool got most of ot
http://www.babelcolor.com/main_level/screen_shots/PatchTool_Compare_Stats.htm
Provide the data so that anyone who has it can report it.
Spatial differences
(http://www.babelcolor.com/main_level/screen_shots/PatchTool_Compare_view2.htm)
would be handy to catch differences due to e.g. compensation or lack
of it (mentioned by Graeme) or due to "full arm stretch syndrome"
(FASS) *just kidding* for the iO. I don't know if the thresholds in
PathTool are hard coded? I don't have PatchTool.
Good luck
Martin Weberg
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