Re: Difference in instruments measurements
Re: Difference in instruments measurements
- Subject: Re: Difference in instruments measurements
- From: <email@hidden>
- Date: Thu, 05 May 2005 16:35:13 -0400
Roger,
Avian Technologies is a North-American distributor of the
CERAM tiles and offers calibration, but for 8 degrees /
hemispherical geometry only, not 45/0...
http://www.aviantechnologies.com
There is a not too old article which shows 45/0 results
for the CERAM tiles (and results from other geometries):
F. Malkin, et al., Journal of the Society of Dyers and
Colourists 113: 84-94 (1997)
but you need to purchase it from the SDC.
I saw the spectrums from F. Malkin & al (not the article)
and they often are very close to recent i1 Pro spectrums
of same model tiles (not enough to be used as reference
though, and there can be even larger differences for some
of the tiles).
One suggestion I may offer is to measure a ColorChecker
with both instruments, and then check which one is farther
from the average chart data (that you can find on my
company's web site). Since the error between your two
instruments is bigger than the average ColorChecker chart
error, you will at least have an indication of which
instrument is likely off.
One caveat : most of the measurements I have were done
with various GMB instruments, Eye-ones in particular!
Sorry if this does not solve your problem. This is a
difficult issue to solve without spending an arm and a leg
on calibration services and comparative tests between
labs.
Danny Pascale
dpascale AT BabelColor DOT com
On Thu, 05 May 2005 15:23:58 -0400
Roger Breton <email@hidden> wrote:
I wrote:
But it could be a much cheaper alternatives to a set of
Spectralon or BCRA tiles while playing more or less the
same role.
I checked the CERAM web site for more information about
their BCRA tiles and
nowhere is it said that their standards include 0/45
reflectance data?
Roger Breton | Laval, Canada | email@hidden
http://pages.infinit.net/graxx
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