Re: Difference in instruments measurements
Re: Difference in instruments measurements
- Subject: Re: Difference in instruments measurements
- From: Ken Fleisher <email@hidden>
- Date: Wed, 04 May 2005 23:32:55 -0400
Yes. And that's provided they come with 0/45 measurements. And I need
more
than just a white tile because white is not going to catch all
wavelengths
errors, I once found out. So, it's an expensive proposition.
Well, there are ways to transfer the scale between devices, even ones
with different geometry. Here is one paper that summarizes some
techniques to obtain inter-instrument agreement:
http://www.npes.org/standards/Tools/WhitePaper.pdf
Here are two others, but these are not free downloads. At least you may
find the references useful (sorry I couldn't find free copies available
for download):
http://www3.interscience.wiley.com/cgi-bin/abstract/50248/ABSTRACT
L. Reniff, "Transferring the 45/0 spectral reflectance factor scale,"
Color Res. Appl., 19, 332-340 (1994).
These are fairly technical, but many on this list may find them
helpful. The article with the link to the abstract ("An abridged
technique to diagnose spectrophotometric errors") describes a technique
that uses just a cyan tile, so you can get away with not having the
whole set.
Hope this helps.
Ken Fleisher
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