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| colourvision-package | Colour Vision Models |
| bee | Honeybee photoreceptors |
| colourvision | Colour Vision Models |
| CTTKhexagon | Chittka (1992) colour hexagon |
| CTTKhexagon3D | Chittka (1992) colour space for tetrachromatic animals. |
| CTTKmodel | Chittka colour vision models |
| D65 | CIE Standard Illuminant D65 in quantum flux (umol/m2/s) |
| EMmodel | Endler and Mielke colour vision model |
| EMtetrahedron | Endler and Mielke tetrahedron colour space |
| EMtriangle | Endler and Mielke triangle colour space |
| energytoflux | Irradiance from energy to quantum units. |
| logistic | Logistic curve |
| noise_e | Receptor noise |
| photor | Photoreceptor sensitivity spectra. |
| Q | Total photon capture |
| Qr | Photoreceptor relative quantum catch |
| Rb | Brazilian savannah background reflectance spectrum. |
| RNLmodel | Receptor Noise Limited Models |
| spec.denoise | Smooth function for reflectance spectra. |