EMtriangle: Endler and Mielke (2005) triangle colour space
In colourvision: Colour Vision Models

Description Usage Arguments Details Author(s) References See Also Examples

Plots a triangle colour space for trichromatic Endler and Mielke (2005) colour vision model.

EMtriangle(x, y, type=c("length", "edge"), vnames=c("u","s","m"),
           ylim=c(-0.9,0.9), xlim=c(-0.9,0.9),
           pch=16, bty="n",yaxt="n",xaxt="n",
           col="black", asp=1, ann=FALSE, vectors=FALSE, ...)

`x`	x-coordinate
`y`	y-coordinate
`type`	Whether the colour space should be built with a fixed vector length, or a fixed edge length (distance between vertices).
`vnames`	Vector names
`ylim`	see `plot` function.
`xlim`	see `plot` function.
`pch`	see `par` function.
`bty`	see `par` function.
`yaxt`	see `par` function.
`xaxt`	see `par` function.
`col`	see `par` function.
`asp`	see `plot` function.
`ann`	see `par` function.
`vectors`	Whether vectors representing direction of photoreceptor outputs should be plotted.
`...`	Other arguments passed to `plot`.

The original model is available for tetrachromatic animals only. Trichromatic version is implemented in colourvision based on Pike (2012) formula. The triangle is built either with a vector length = 0.75 or a edge length = sqrt(3/2), to match the tetrahedron proposed by Endler and Mielke (2005). Doris Gomez derived a trichromatic version which is available in software AVICOL (Gomez, 2006) and was previously implemented here (colouvision v0.1).

Felipe M. Gawryszewski f.gawry@gmail.com

Endler, J. A., and P. Mielke. 2005. Comparing entire colour patterns as birds see them. Biol J Linn Soc 86:405-431.

Pike, T.W. 2012. Generalised chromaticity diagrams for animals with n-chromatic colour vision. Journal of Insect Behavior 255: 277-286.

Gomez, D. 2006. AVICOL, a program to analyse spectrometric data. Last update october 2011. Free executable available at:
http://sites.google.com/site/avicolprogram/ or from the author at dodogomez@yahoo.fr

EMtetrahedron, EMmodel