ABC: Standard Illuminants A, B, and C (1931)

Description Format Details Source References See Also Examples

Description

A.1nm standard Illuminant A, 360 to 780 nm at 1 nm intervals
B.5nm standard Illuminant B, 320 to 780 nm at 5 nm intervals
C.5nm standard Illuminant C, 320 to 780 nm at 5 nm intervals

Format

Each is a colorSpec object organized as a vector, with quantity equal to "energy".

Details

All of these have been divided by 100, to make the values at 560nm near 1 instead of 100.

Source

http://www.cvrl.org

References

Günther Wyszecki and W. S. Stiles. Color Science : Concepts and Methods, Quantitative Data and Formulae. Second Edition. Wiley-Interscience. 1982.

A Table I(3.3.4) pp. 754-758.
B Table II(3.3.4) pp. 759.
C Table II(3.3.4) pp. 759.

See Also

D50 D65

Examples

1
2
summary(xyz1931.1nm)
white.point = product( D65.1nm, xyz1931.1nm, wave='auto' )

Example output

This is colorSpec.  Version: 0.5-3.  Author: Glenn Davis [aut, cre].  Built: R 3.4.1; ; 2017-09-21 19:34:23 UTC; unix

colorSpec object.   The organization is 'matrix'.  Object size is 17784 bytes.
the object describes a responder to light with 3 output channels, and the quantity is 'power->neural'.
Wavelength range: 360 to 830 nm.  Step size is 1 nm.

3 spectra
471 data points / spectrum

  Channel          Min      Max LambdaMax E.response
1       x 1.251141e-06 1.062910       599   106.8655
2       y 4.518100e-07 1.000000       555   106.8569
3       z 0.000000e+00 1.782968       446   106.8923
--------------- metadata: start ------------------

path  =  ../inst/extdata/eyes/ciexyz31_1.csv

header  = 
#   the 1931 color matching functions at 1nm interval
#
#   the data is from
#   Wyszecki & Stiles
#   Color Science, 2nd edition.
#   Table I(3.3.1)  pp. 723-735.
#
#   It was downloaded from http://www.cvrl.org/

--------------- metadata: end ------------------

colorSpec documentation built on June 24, 2019, 9:03 a.m.