R: Gray Color Palette

gray.colors {grDevices} | R Documentation

## Gray Color Palette

### Description

Create a vector of `n` gamma-corrected gray colors.

### Usage

    gray.colors(n, start = 0.3, end = 0.9, gamma = 2.2, alpha = NULL)
    grey.colors(n, start = 0.3, end = 0.9, gamma = 2.2, alpha = NULL)

### Arguments

`n` | the number of gray colors (≥ 1) to be in the palette.
`start` | starting gray level in the palette (should be between `0` and `1` where zero indicates `"black"` and one indicates `"white"`).
`end` | ending gray level in the palette.
`gamma` | the gamma correction.
`alpha` | the opacity, is specified.

### Details

The function `gray.colors` chooses a series of `n` gamma-corrected gray levels between `start` and `end`: `seq(start^gamma, end^gamma, length = n)^(1/gamma)`. The returned palette contains the corresponding gray colors. This palette is used in `barplot.default`.

`grey.colors` is an alias for `gray.colors`.

### Value

A vector of `n` gray colors.

### See Also

`gray`, `rainbow`, `palette`.

### Examples

    require(graphics)

    pie(rep(1, 12), col = gray.colors(12))
    barplot(1:12, col = gray.colors(12))

[Package grDevices version 3.1.2 Index]