Create Transparency {GISTools} | R Documentation |
Add transparency to a hex-defined colour
Description
Takes a colour defined in hex format as #XXXXXX
and adds a two transparency bytes XX
based on a number from 0 to 1. Its main use is to make RColorBrewer palettes transparent.
Usage
add.alpha(hex.color.list,alpha)
Arguments
hex.color.list |
A list of strings defining solid colors in six byte format. |
alpha |
A value (or list of values) from 0 to 1 specifying transparency. |
Value
A list of strings defining transparent colours in eight byte format.
Author(s)
Chris Brunsdon
Examples
# Make a list of semi-transparent RColorBrewer colours, based on Brewer's Red palette with 5 shades
require(RColorBrewer)
add.alpha(brewer.pal(5,'Reds'),0.5)
[Package GISTools version 1.0-0 Index]