Converts a coldist output into Cartesian coordinates that are perceptually-corrected (i.e. Euclidean distances = JND distances)

jnd2xyz(coldistres, center = TRUE, rotate = TRUE,
  rotcenter = c("mean", "achro"), ref1 = "l", ref2 = "u",
  axis1 = c(1, 1, 0), axis2 = c(0, 0, 1))

Arguments

coldistres

(required) the output from a coldist call.

center

logical indicating if the data should be centered on its centroid (defaults to TRUE).

rotate

logical indicating if the data should be rotated (defaults to TRUE).

rotcenter

should the vectors for rotation be centered in the achromatic center ("achro") or the data centroid ("mean", the default)?

ref1

the cone to be used as a the first reference. May be NULL (for no first rotation in the 3-dimensional case) or must match name in the original data that was used for coldist. Defaults to 'l'.

ref2

the cone to be used as a the second reference.May be NULL (for no first rotation in the 3-dimensional case) or must match name in the original data that was used for coldist. Defaults to 'u'. (only used if data has 3 dimensions).

axis1

A vector of length 3 composed of 0's and 1's, with 1's representing the axes (x,y,z) to rotate around. Defaults to c(1,1,0), such that the rotation aligns with the xy plane (only used if data has 2 or 3 dimensions). Ignored if ref1 is NULL (in 3-dimensional case only)

axis2

A vector of length 3 composed of 0's and 1's, with 1's representing the axes (x,y,z) to rotate around. Defaults to c(0,0,1), such that the rotation aligns with the z axis (only used if data has 3 dimensions). Ignored if ref2 is NULL (in 3-dimensional case only)

References

Pike, T.W. (2012). Preserving perceptual distances in chromaticity diagrams. Behavioral Ecology, 23, 723-728.

Maia, R., White, T. E., (2018) Comparing colors using visual models. Behavioral Ecology, ary017 doi: 10.1093/beheco/ary017

Examples

# NOT RUN {
data(flowers)
vis.flowers <- vismodel(flowers)
cd.flowers <- coldist(vis.flowers)
jnd2xyz(cd.flowers)
# }