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

LUV(L, U, V, names)


L, U, V

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


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


An object of class LUV which inherits from class color.


The L, U and V values give the coordinates of the colors in the CIE (1976) \(L^*u^*v^*\) space. This is a transformation of the 1931 CIE XYZ space which attempts to produce perceptually based axes. Luminance takes values between 0 and 100, and the other coordinates typically take values between -100 and 100, although these values can also be exceeded by highly saturated colors. The \(u\) and \(v\) coordinates measure positions on green/red and blue/yellow axes.

See also


Ross Ihaka


## Show the LUV space set.seed(1) x <- RGB(runif(1000), runif(1000), runif(1000)) y <- as(x, "LUV") head(x)
#> R G B #> [1,] 0.2655087 0.5308088 0.871805
#> L U V #> [1,] 76.00763 -25.7427 -45.3886