Calculates coordinates and colorimetric variables that represent reflectance spectra in the avian tetrahedral color space.
Arguments
- vismodeldata
(required) quantum catch color data. Can be either the result from
vismodel()
or independently calculated data (in the form of a data frame with four columns name 'u', 's', 'm', 'l', representing the avian cones).
Value
A data frame of class colspace
consisting of the following columns:
u
,s
,m
,l
: the quantum catch data used to calculate the remaining variables. NOTE: even if visual system is of type V-VIS, the output column will be labeledu
.u.r
,s.r
,m.r
,l.r
: relative cone stimulation, for a given hue, as a function of saturation. See Stoddard & Prum (2008) for details.x
,y
,z
: cartesian coordinates for the points in the tetrahedral color space.h.theta
,h.phi
: angles theta and phi, in radians, determining the hue of the color.r.vec
: the r vector (saturation, distance from the achromatic center).r.max
: the maximum r vector achievable for the colour's hue.r.achieved
: the relative r distance from the achromatic center, in relation to the maximum distance achievable (r.vec/r.max
).
References
Stoddard, M. C., & Prum, R. O. (2008). Evolution of avian plumage color in a tetrahedral color space: A phylogenetic analysis of new world buntings. The American Naturalist, 171(6), 755-776.
Endler, J. A., & Mielke, P. (2005). Comparing entire colour patterns as birds see them. Biological Journal Of The Linnean Society, 86(4), 405-431.
Author
Rafael Maia rm72@zips.uakron.edu