R: Create LAB Colors

LAB {colorspace} | R Documentation

## Create LAB Colors

### Description

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

### Usage

    LAB(L, A, B, names)

### Arguments

`L, A, B` | these arguments give the L, A and B coordinates of the colors. The values can be provided in separate `L`, `A` and `B` 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).

### Details

The `L`, `A` and `B` values give the coordinates of the colors in the CIE L*a*b* 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 a and b coordinates measure positions on green/red and blue/yellow axes.

### Value

An object of class `LAB` which inherits from class `color`.

### Author(s)

Ross Ihaka

### See Also

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

### Examples

    ## Show the LAB space
    set.seed(1)
    x <- RGB(runif(1000), runif(1000), runif(1000))
    y <- as(x, "LAB")
    head(x)
    head(y)
    plot(y)

[Package colorspace version 2.0-0 Index]