add.alpha {prettyGraphs}

add.alpha

Description

A function to add alpha levels to RGB colors.

Usage

  add.alpha(col,alpha)

Arguments

col

color from colors()

alpha

alpha level (between 0 and 1)

Note

This code was created by Markus Gesmann. Derek Beaton included the code in prettyGraphs because it is a versatile function and used in prettyGraphs. See: https://magesblog.com/post/2013-04-30-how-to-change-alpha-value-of-colours-in/

Author(s)

Markus Gesmann