colorspace (version 0.9)

LUV: Create LUV Colors

Description

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

Usage

LUV(L, U, V, names)

Arguments

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.

names

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

Value

• An object of class ``LUV'' which inherits from class ``color.''

Details

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 take values between -100 and 100. The $a$ and $b$ coordinates measure positions on green/red and blue/yellow axes.

See Also

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

Examples

## Show the LUV space
x = RGB(runif(1000), runif(1000), runif(1000))
plot(as(x,"LUV"))