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.