CTTKhexagon             Chittka (1992) colour hexagon
CTTKhexagon3D           Chittka (1992) colour space for tetrachromatic
                        animals.
CTTKmodel               Chittka (1992) colour vision model
D65                     CIE Standard Illuminant D65 in quantum flux
                        (umol/m2/s)
EMline                  Endler and Mielke (2005) 1-D colour space
EMmodel                 Endler and Mielke (2005) colour vision model
EMtetrahedron           Endler and Mielke (2005) tetrahedron colour
                        space
EMtriangle              Endler and Mielke (2005) triangle colour space
GENmodel                N-dimensional generic colour vision model
GENplot                 Generic model colour space 2D and 1D plot
GENplot3d               Generic model colour space 3D plot
Q                       Total photon capture
Qr                      Photoreceptor relative quantum catch
RNLachrom               Weber achromatic contrast for the Receptor
                        Noise Limited Model (Vorobyev & Osorio 1998)
RNLmodel                Receptor Noise Limited Models (Vorobyev &
                        Osorio 1998)
RNLplot                 Receptor noise limited model 2D and 1D plot
RNLplot3d               Receptor noise limited model 3D plot
RNLthres                Colour thresholds based on the Receptor Noise
                        Limited Model (Vorobyev & Osorio 1998).
Rb                      Brazilian savannah background reflectance
                        spectrum.
bee                     Honeybee photoreceptors
colour_space            N-dimensional colour spaces
colourvision-package    Colour Vision Models
deltaS                  Chromaticity distances
energytoflux            Irradiance from energy to quantum units.
logistic                Logistic curve
noise_e                 Receptor noise
photor                  Photoreceptor sensitivity spectra.
plot.colourvision       Plot colour vision models into chromaticity
                        diagrams
plot3d.colourvision     Plot colour vision models into 3D chromaticity
                        diagrams.
radarplot               Radar plot
spec.denoise            Smooth function for reflectance spectra.
