Calculates coordinates and colorimetric variables that represent reflectance spectra in the color opponent coding model of hymenopteran vision.

coc(vismodeldata)

## 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: coordinates for the points in coc space

• r.vec: the r vector (saturation, distance from the center using a city-block metric).

## References

Backhaus W. (1991). Color opponent coding in the visual system of the honeybee. Vision Research, 31, 1381-1397.

## Examples

data(flowers)
vis.flowers <- vismodel(flowers, visual = "apis", qcatch = "Ei", relative = FALSE, vonkries = TRUE)
coc.flowers <- colspace(vis.flowers, space = "coc")