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' )

colorSpec documentation built on April 2, 2018, 5:05 p.m.