highlightCol {motifStack} | R Documentation

## add alpha transparency value to a color

### Description

An alpha transparency value can be specified to a color, in order to get better color for background.

### Usage

    highlightCol(col, alpha = 0.5)

### Arguments

`col` | vector of any of the three kinds of R color specifications, i.e., either a color name (as listed by colors()), a hexadecimal string of the form "#rrggbb" or "#rrggbbaa" (see rgb), or a positive integer i meaning palette()[i].
`alpha` | a value in [0, 1]

### Value

a vector of colors in hexadecimal string of the form "#rrggbbaa".

### Author(s)

Jianhong Ou

### Examples

        highlightCol(1:5, 0.3)
        highlightCol(c("red", "green", "blue"), 0.3)

[Package motifStack version 1.31.2 Index]