Create polarLUV (HCL) Colors

This function creates colors of class ``polarLUV''; a subclass of the virtual color-class class.

polarLUV(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 polarLUV which inherits from class color.

Details

The polarLUV space is a transformation of the CIE L∗u∗v∗ space so that the u and v values are converted to polar coordinates. The radial component C measures chroma and the angular coordinate H is measures hue. It is also known as the HCL (hue-chroma-luminance) space.

See also

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

Author

Ross Ihaka

Examples

## Show the polarLUV space
set.seed(1)
x <- sRGB(runif(1000), runif(1000), runif(1000))
y <- as(x, "polarLUV")
head(x)
#>              R         G        B
#> [1,] 0.2655087 0.5308088 0.871805
head(y)
#>             L        C        H
#> [1,] 56.02127 84.38279 251.8006
plot(y)