Create polarLAB Colors

This function creates colors of class “polarLAB”; a subclass of the virtual color-class class.

polarLAB(L, C, H, names)

Arguments

L, C, H

these arguments give the L, C and H coordinates of the colors. The values can be provided in separate L, C and H vectors or in a three-column matrix passed as L.

names

A vector of names for the colors (by default the row names of L are used).

Value

An object of class polarLAB which inherits from class color.

Details

The polarLAB space is a transformation of the CIE \(L^*a^*b^*\) space so that the \(a\) and \(b\) values are converted to polar coordinates. The radial component \(C\) measures chroma and the angular coordinate \(H\) is measures hue.

See also

RGB, HSV, XYZ, LAB, polarLAB, LUV, polarLUV.

Author

Ross Ihaka

Examples

## Show the polarLAB space
set.seed(1)
x <- sRGB(runif(1000), runif(1000), runif(1000))
y <- as(x, "polarLAB")
head(x)
#>              R         G        B
#> [1,] 0.2655087 0.5308088 0.871805
head(y)
#>             L        C        H
#> [1,] 56.02127 51.05415 277.7611
plot(y)