RE: 1931 Standard Observer
RE: 1931 Standard Observer
- Subject: RE: 1931 Standard Observer
- From: Adam Dewitz <email@hidden>
- Date: Thu, 25 May 2006 00:22:04 -0400
Roberto Michelena wrote:
Did I read that the 1931 CMFs were derived from about
only 10 people?
There were two data sets used to to create the color-matching system
agreed upon by the Colorimetry Committee of the CIE in 1931. The
first was John Guild's data in which he measured seven observers and
the second was W.D. Wright's data in which in measured ten
observers. These both used the 2-degree viewing angle. (Billmeyer
and Saltzman's Principles of Color Technology, 3rd Ed.)
This combined data set was further validated in 1955 when Walter
Stiles reported the results from an experiment in which he used a
trichromator to measure the spectral chromaticity coordinates of 10
observers. (W.D. Wright, 50 years of the 1931 CIE standard observer
for colorimetry, AIC Color 81, Paper A3 (1981))
The journey to the current use of Delta E is also interesting. I
published a lit review of this 'journey' on my blog at http://
printmode.net/blog/archives/2006/01/19/delta_e.php that you might be
interested in.
Regards,
Adam
Printmode.net
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