Calculates coordinates and colourimetric variables that represent reflectance spectra in the hymenopteran colour hexagon.
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 variablesx
,y
: cartesian coordinates in the colour hexagon.h.theta
: hue angle theta (in degrees), with 0-degrees at the 1200 angle, increasing clockwise.r.vec
: the r vector (saturation, distance from the center).sec.fine
: fine 'hue sector', wherein the full hexagon is composed of 36 10-degree sectors, with 0-degrees at the 1200 angle.sec.coarse
: coarse 'hue sector', wherein the full hexagon is composed of five sectors: blue, bluegreen, green, uvgreen, uv, and uvblue.
References
Chittka L. (1992). The colour hexagon: a chromaticity diagram based on photoreceptor excitations as a generalized representation of colour opponency. Journal of Comparative Physiology A, 170(5), 533-543.
Chittka L, Shmida A, Troje N, Menzel R. (1994). Ultraviolet as a component of flower reflections, and the colour perception of Hymenoptera. Vision research, 34(11), 1489-1508.
Author
Thomas White thomas.white026@gmail.com