[argyllcms] Re: i1Pro Ruler (was DTP41 - is it useful?)
- From: Graeme Gill <graeme@xxxxxxxxxxxxx>
- To: argyllcms@xxxxxxxxxxxxx
- Date: Thu, 21 Dec 2017 10:20:31 +1100
Lars-Daniel Weber wrote:
I've heard, the gap between i1 Pro and target is important in terms of lense
If the target is out of focus, there will be a different result.
this is not the case with the i1Pro. It is routinely used without any guide,
on samples, and directly contacts the white calibration tile for instance.
(The DTP20 on the other hand, does need to be spaced correctly).
Because of the way the black pre-calibration works when measuring reflection,
fact is better if it seals well against the sample.
The guide rulers do space it very slightly away from the paper to minimize
friction, wear and marking of the samples, but this amounts to a small
fraction of a mm.
(A quick measurement indicates that the "lip" around the instrument aperture
is 1.0 mm, and the thickness of the guide rulers is about 1.1 mm, so the
spacing is around 0.1 mm).
"setting the device directly on the sample" :)
isn't there some kind of ultra-transparent foil to put over the sample to
protect device and sample?
Not that I'm aware of. Any such covering will affect measurements, dues
to losses through the material, inter-reflection, and change in gloss.
(Most plastics block ultra violet wavelengths for instance).
Isn't the Colormunki design to be run "on paper" directly?
Yes and no. That's the way it is intended to work, but it has two little
rubber bumpers on it to help stop it slipping when doing a spot measurement,
and these impede moving it smoothly when measuring a strip. Used often enough,
and these rubber bumpers will wear away!
[ Hey - good idea to combine your comments into a single reply if you can,
than flooding the mailing list! ]
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