Calculates coordinates and colourimetric variables that represent reflectance spectra in a trichromatic chromaticity space.
Arguments
- vismodeldata
(required) quantum catch colour data. Can be either the result from
vismodel()
or independently calculated data (in the form of a data frame with three columns named 's', 'm', 'l', representing a trichromatic viewer).
Value
A data frame of class colspace
consisting of the following columns:
s
,m
,l
: the quantum catch data used to calculate the remaining variables.x
,y
: cartesian coordinates for the points in the Maxwell triangle.h.theta
: angle theta, in radians, determining the hue of the colour.r.vec
: the r vector (saturation, distance from the center).
References
Maxwell JC. (1970). On color vision. In: Macadam, D. L. (ed) Sources of Color Science. Cambridge, MIT Press, 1872 - 1873.
Kelber A, Vorobyev M, Osorio D. (2003). Animal colour vision - behavioural tests and physiological concepts. Biological Reviews, 78, 81 - 118.
MacLeod DIA, Boynton RM. (1979). Chromaticity diagram showing cone excitation by stimuli of equal luminance. Journal of the Optical Society of America, 69, 1183-1186.
Author
Thomas E. White thomas.white026@gmail.com