Re: CororChecker SG CIE reference values (or lack of)
Re: CororChecker SG CIE reference values (or lack of)
- Subject: Re: CororChecker SG CIE reference values (or lack of)
- From: Klaus Karcher <email@hidden>
- Date: Fri, 18 Dec 2009 12:40:51 +0100
Scott Martin wrote:
Good point. The reference file *should* be easily available on their
website, at least.
For your own purposes and software you should be able to include XRIte
reference file
(just sent directly to your email address) or make you own.
Graeme Gill wrote:
If I had a ColorChecker SG, I could perhaps make my own (I actually have
a ColorChecker DC, which did come with a reference file). I' pretty
sure I don't have copyright permission to post X-Rite's (presumably
batch averaged
and used as the target for quality assurance) measurements to a website.
you are absolutely right, Graeme: every ColorChecker should come along
with a reference file or at least an URL that links to the reference
file -- or XRite should release "official" reference files and
documentation to the public domain.
I have at least two different spectral reference files for the
ColorChecker SG.
One was part of my ProfileMaker installation:
/Applications/ProfileMaker Pro 5.0.8/Reference Files/Scanner/Digital
ColorChecker SG.txt:
CREATED "4/13/2005" # Time: 14:39
INSTRUMENTATION "Spectrolino"
and the second was supplied by a customer:
CREATED "3/24/2004" # Time: 20:14
INSTRUMENTATION "eye-one"
I don't know the origin of the customer's file, but the identical
filenames and formating suggest that also the second file was part of
some GMB/Xrite installation. They are fairly similar (DE00 max 2.32,
avg. 0.67, 90% <= 1.08).
The patch with DE00 2.39 is E9 (dark green). Other than that only some
of the gray and black calibration patches on the margins exceed DE00 = 1.08.
I cross-checked the customer's Color Checker SG by means of spot samples
with a Spectrolino and two eye-ones and found that the 2005 Spectrolino
reference file goes better with my measurements. The 2005 reference file
matched the target within the bounds of inter-instrument-agreement.
Whenever I have to use a new ColorChecker SG, I make some spot sample
measurements. Until now I found only one (out of approx. 8-10) that
differed significantly from the 2005 reference file.
Klaus
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