R: Modify colour transparency. Vectorised in both colour and...

alpha {scales} | R Documentation

## Modify colour transparency. Vectorised in both colour and alpha.

### Description

Modify colour transparency. Vectorised in both colour and alpha.

### Usage

    alpha(colour, alpha = NA)

### Arguments

`colour` | colour
`alpha` | new alpha level in [0,1]. If alpha is `NA`, existing alpha values are preserved.

### Examples

    alpha("red", 0.1)
    alpha(colours(), 0.5)
    alpha("red", seq(0, 1, length.out = 10))

[Package scales version 0.4.1 Index]